BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:PHYSICAL FEATURES OF THE VVER-1200 REACTOR CORE REFLECTOR MODEL IN SERPENT CODE DTSTART;VALUE=DATE-TIME:20220715T153000Z DTEND;VALUE=DATE-TIME:20220715T155000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-245@events.sinp.msu.ru DESCRIPTION:Speakers: Krystsina Usheva ()\nReactor codes (BIPR\, DYN3D [1] \, etc.) based on solving the neutron transport equation in the diffusion approximation are widely used to analyze stationary and transient processe s in the reactor core. To perform such type of calculation it is necessary to create a XS library - a set of macroscopic cross sections and constant s. It is usually calculated using spectral codes such as deterministic (HE LIOS\, TVS-M\, etc.) or Monte Carlo (Tripoli\, Serpent [2]\, etc.).\nWhen modeling the whole reactor core\, the question is about the boundary condi tions at the outer boundary of the fuel part. In VVER-type reactor\, the e nvironment of the fuel part (baffle and other internal elements) plays the role of a reflector for thermal neutrons\, in which there is no neutron s ource.\nTo calculate and create a XS library of sections for the reflector \, a model of ¼ reactor core was created (Fig. 1)\, which allows correctl y take into account the full spectrum of neutrons created in the fuel part of the core and interacting with a two-layered reflector (R1-R2).\n\n \nF ig. 1. Model of radial reflector.\n\nIn this paper\, a model of a radial r eflector for VVER-1200 reactor is proposed for calculating and preparing a XS library using Serpent Monte Carlo code for DYN3D diffusion code\, taki ng into account physical features at the reactor core outer boundary.\n\n1 . U. Rohde\, S. Kliem\, U. Grundmann\, S. Baier\, Y. Bilodid et. all. The reactor dynamics code DYN3D – models\, validation and applications\, Pro gress in Nuclear Energy 89\, p. 170-190 (2016).\n2. J. Leppänen. Serpent – a Continuous-energy Monte Carlo Reactor Physics Burnup Calculation Cod e. User’s Manual. VTT Technical Research Centre of Finland\, 164 p. (201 5).\n\nhttps://events.sinp.msu.ru/event/8/contributions/245/ LOCATION: НИИЯФ\, 19 к\, ауд. 2-15 URL:https://events.sinp.msu.ru/event/8/contributions/245/ END:VEVENT BEGIN:VEVENT SUMMARY:Investigation of the Conditions for the Formation of Particle Flux es and High-Power Radiation in a Plasma with a Strong Magnetic Field DTSTART;VALUE=DATE-TIME:20220715T145000Z DTEND;VALUE=DATE-TIME:20220715T151000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-625@events.sinp.msu.ru DESCRIPTION:Speakers: Nikita Kopaleishvili ()\nDue to the high-energy part icles of thermonuclear reactions\, the generation of neutron and X-ray rad iation is possible\, nuclear fusion reactions can occur\, in which particl es of even higher energies are born (for example\, protons with an energy of 14 MeV)\, the use of which is possible in a number of applied technolog ies for medicine\, safety and disposal nuclear waste.\nPlasma maintenance in a highly nonequilibrium state requires a very powerful driver (heating energy source)\, and therefore one should not count on the fact that such a plasma will provide an energy output that greatly exceeds the driver ene rgy. However\, it should be emphasized that the conversion of the energy o f the driver into the energy of beams and radiation from the plasma has a very high efficiency compared\, for example\, with classical accelerator s ystems. Also\, such a plasma that generates neutrons of the megaelectronvo lt range can itself be a driver of a subcritical nuclear system\, in which (in the chains of transformations triggered by these neutrons) nuclear fu el is produced and waste from the nuclear fuel cycle is simultaneously dis posed of. Such a symbiotic "fusion-fission" system achieves a multiple inc rease in energy output.\n\nhttps://events.sinp.msu.ru/event/8/contribution s/625/ LOCATION: НИИЯФ\, 19 к\, ауд. 2-15 URL:https://events.sinp.msu.ru/event/8/contributions/625/ END:VEVENT BEGIN:VEVENT SUMMARY:Comparative analysis of various variants of magneto-inertial therm onuclear fusion DTSTART;VALUE=DATE-TIME:20220715T143000Z DTEND;VALUE=DATE-TIME:20220715T145000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-624@events.sinp.msu.ru DESCRIPTION:Speakers: Nikita Batrak ()\nThe paper presents a comparative a nalysis of various variants of magnetic inertial fusion. The main thermoph ysical parameters of such installations with high-pulse energy lasers and high-speed plasma jets are determined. It is shown that modern thermonucle ar plants\, as well as those under development\, can be used for a wide ra nge of research and directions.\nComparison of various options for the imp lementation of magnetic inertial fusion allows us to see a wide range of u nexplored tasks and\, accordingly\, the trajectory of action soon. The wor k also compared laser installations that are used for the implementation o f MITS. Namely MagLIF\, Z-Machine\, NIF and OMEGA. In addition\, the artic le mentioned other installations with a description of their use in variou s experiments. The paper also talks about some startups of the last ten ye ars that will be implemented soon.\n\nhttps://events.sinp.msu.ru/event/8/c ontributions/624/ LOCATION: НИИЯФ\, 19 к\, ауд. 2-15 URL:https://events.sinp.msu.ru/event/8/contributions/624/ END:VEVENT BEGIN:VEVENT SUMMARY:Neutron response function of CeBr3-NaI(Tl) phoswich spectrometer for 1.0 ÷ 5.5 MeV neutron energy range DTSTART;VALUE=DATE-TIME:20220713T153000Z DTEND;VALUE=DATE-TIME:20220713T155000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-248@events.sinp.msu.ru DESCRIPTION:Speakers: Zhassulan Zeinulla (JINR\, Dubna\, Russia)\nThe γ-s pectrometer [1] which was assembled from 9 CeBr3-NaI(Tl) phoswich detector s [2] is a unit of the MULTI facility at the FLNR\, JINR (Dubna) for study ing the γ-emission in exotic decay of neutron-rich weakly bound nuclei li ke β-decay through giant dipole and pygmy resonances. It was reported [1] a high time and energy resolution\, high peak and suppression efficiency of this spectrometer operated in the Compton suppression mode. This repor t is devoted to neutron detection efficiency and influence of neutron back ground on γ-spectra\, particularly spectra obtained in the Compton suppre ssion mode.\nThe energy dependence of neutron detection efficiency at En = 1.0 5.5 MeV energy range has been investigated. The measurements were c arried out by the method of tagged neutrons and 239Pu/9Be source. The α-d ecay of 239Pu is not accompanied by γ emission. Only γ quanta Eγ = 4.43 MeV from the 9Be(α\, n)12C* reaction can accompanied the neutrons in abo ut 60% of reaction events. These γ quanta can be used as a trigger in the method of tagged neutrons and for En measuring by Time-of-Flight. \nThe m ain characteristics of the γ-ray spectrometer are presented: energy resol utions ΔE\, n-γ detection efficiency δγ(E) and δn(E) depending on the γ and n energy\, respectively. The special attention was focused on the studying of neutron detection efficiency δn(E) of the CeBr3 component of phoswich detectors for Compton suppression mode. The pulse shape analysis of phoswich detector scintillation pulses was carried out by VME unit Mesy tec MDPP-16 QDC pulse processor [3]. The neutron detection efficiency was obtained from tagged neutron spectra normalized to published [4] neutron s pectra from a 239Pu/9Be source. \n\n1. Zh. Zeinulla\, Yu.G. Sobolev\, S.S. Stukalov\, I. Sivacek\, Yu.E. Penionzhkevich\, Gamma-ray spectrometer ass embled from 9 CeBr3-NaI(Tl) phoswich detectors\, Acta Physica Polonica B\, Vol.14\, N4\, pp.. 755-760\, (2021)\;\n2. M. Gierlik et al.\, IEEE Transa ctions on Nuclear Science 53\, 1737 (2006).\n3. A. Ruben et al.\, «A New\ , Versatile\, High-performance Digital Pulse Processor with Application to Neutron/Gamma-Ray Pulse-Shape Discrimination in Scintillator Detectors»\ , DOI:10.13140/RG.2.2.14187.18727.\n4. Van der Zwan\, L. 1968. Can. J. Ph ys.\, 46\, 1527.\n\nhttps://events.sinp.msu.ru/event/8/contributions/248/ LOCATION: Физический ф-т\, ауд. 5-19 URL:https://events.sinp.msu.ru/event/8/contributions/248/ END:VEVENT BEGIN:VEVENT SUMMARY:DEVELOPMENT OF THE CRITERION FOR THE IDENTIFICATION OF CONTRAST AG ENTS IN PHOTON-COUNTING COMPUTED TOMOGRAPHY DTSTART;VALUE=DATE-TIME:20220713T151000Z DTEND;VALUE=DATE-TIME:20220713T153000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-562@events.sinp.msu.ru DESCRIPTION:Speakers: Rostislav Sotenskiy (JINR)\nThe identification of su bstances is one of the tasks in the development of a new multi-energy X-ra y tomograph based on the Widepix detector. The Widepix detector is one of Medipix series detectors\, which are hybrid semiconductor pixel detectors\ , developed by the Medipix collaboration. This detector has a high spatial resolution and is capable of detecting radiation in different energy rang es\, which makes it possible to use it in photon-counting computed tomogra phy (PCCT).\nThis report presents the development and the results of apply ing a criterion for identifying contrast agents for samples containing var ious concentrations of lanthanum. This criterion was investigated on the b asis of energy information presented in the form of a 2D image and a recon structed 3D tomogram. The developed criterion is also capable of estimatin g the concentrations of substances in samples without using the entire ene rgy spectrum\, which makes it possible to reduce the time of sample irradi ation and the time of data collection.\n\nhttps://events.sinp.msu.ru/event /8/contributions/562/ LOCATION: Физический ф-т\, ауд. 5-19 URL:https://events.sinp.msu.ru/event/8/contributions/562/ END:VEVENT BEGIN:VEVENT SUMMARY:TRITIUM LABEL IN STUDYING PROTEIN-LIGAND INTERACTION: SELF-ORGANIZ ATION AT THE INTERFACES DTSTART;VALUE=DATE-TIME:20220713T145000Z DTEND;VALUE=DATE-TIME:20220713T151000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-517@events.sinp.msu.ru DESCRIPTION:Speakers: Maria Chernysheva (Lomonosov Moscow State University )\nTritium is the only radioactive isotope of hydrogen and it is an approp riate radiolabel for organic molecules including surfactants\, peptides\, proteins and etc. Moreover\, tritium as a tracer can be also used for anal ysis of protein-ligand complex formation at the interfaces\, including liq uid-liquid system that is a model of cellular membrane. In the present stu dy we developed a novel approach to the study complexes formation between protein and organic ligand at the interfaces as well as in the bulk of the solution. We used lysozyme as a model protein and as an enzyme of medical purpose. Surfactants\, including ionic and non-ionic\, low and high molec ular weight substances and even humic substances\, were considered as a li gand.\nThe procedure of analysis of protein-ligand intermolecular interact ions includes two important radiochemical stages. First\, studying adsorpt ion of both protein and ligand at the liquid-liquid interface by means of tritium labeled compounds and liquid scintillation spectrometry as a scint illation phase technique [1]. To this end both protein and organic ligand required to be labeled with tritium and we used tritium thermal activation method for radiolabeling [2].\nThe second radiochemical study includes th e bombardment of the protein-ligand mixed adsorption layer with tritium at oms following by the analysis of tritium distribution in the components of the target. In the case of protein\, it was subjected to total hydrolysis and determination of the specific radioactivity of each amino acid. On th e bases of lysozyme structure phenylalanine and proline were chosen as ref erence amino acid residues for determining protein orientation in the mixe d adsorption layer that was done for the adsorption layers with ionic and non-ionic surfactants.\nThe developed approach allowed us to reveal the en capsulation of lysozyme with humic substances and in conjunction with clas sical methods of protein structure analysis to describe completely lysozym e-surfactant complexes. The main results obtained with tritium labeled lys ozyme\, cationic\, anionic and non-ionic surfactants\, and humic substance s will be discussed in the presentation.\n\n1. M.G. Chernysheva\, G.A. Bad un\, Langmuir. 27\, 2188 (2011).\n2. G.A. Badun\, M.G. Chernysheva\, A.L. Ksenofontov\, Radiochimica Acta. 100\, 401 (2012).\n\nhttps://events.sinp. msu.ru/event/8/contributions/517/ LOCATION: Физический ф-т\, ауд. 5-19 URL:https://events.sinp.msu.ru/event/8/contributions/517/ END:VEVENT BEGIN:VEVENT SUMMARY:ADSORPTION MODIFICATION OF NANODIAMONDS WITH TRITIUM-LABELED CATIO NIC SURFACTANTS AND POLYSACCHARIDES DTSTART;VALUE=DATE-TIME:20220713T143000Z DTEND;VALUE=DATE-TIME:20220713T145000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-535@events.sinp.msu.ru DESCRIPTION:Speakers: Artem Sinolits (Lomonosov MSU)\nThe radiotracer meth od is a powerful instrument for studying different physico-chemical proces ses for example adsorption. Using radiotracer technique allows to quantify tritium-labeled substances up to 10-14 mol. Tritium thermal activation te chnique allows protium substitution with tritium in almost any organic com pound without significant changes in its chemical structure [1]. Nanodiamo nds modified with biopolymers and antiseptic drugs are prospective modifie rs of biocompatible materials [2].\nWe developed method of obtaining of tr itium-labeled hyaluronic acid by tritium thermal activation with specific radioactivity of 52 GBq/g with preserved molecular mass distribution [3]. Method included unlabeled hyaluronic acid dialysis through membrane\, hyal uronic acid lyophilization and tritium incorporation by thermal activation . The labeled hyaluronic acid was purified by dialysis that was being cont rolled by high-performance liquid chromatography.\nWith use of radiotracer technique with tritium-labeled compounds (alkyltrimethylammonium bromides \, miramistin\, chitosan\, hyaluronic acid) we studied their adsorption on detonation nanodiamonds. We proposed mechanisms of formation of nanodiamo nd-sorbate complexes with different electrokinetic potential in water susp ensions.\nThe double and triple complexes of nanodiamond with different so rbates under investigation are prospective for biomedical applications. Fo r this purpose\, the sorbates retention on nanodiamond was studied in diff erent media including biological-alike media. Using tritium-labeled compou nds allowed confident quantification of substances desorbed from nanodiamo nds surface and substances adsorbed on nanodiamond surface even in biologi cal-alike media.\nComplexes nanodiamond-miramistin-chitosan and nanodiamon d-miramistin-hyaluronic acid were obtained and characterized for the first time.\n\n1. Badun G.A. Chernysheva M.G.\, Ksenofontov A.L. Radiochim. Act a. 100\, 401 (2012).\n2. Chernysheva M.G. et al. Fullerenes Nanotubes and Carbon Nanostructures. 28(4)\, 256 (2020).\n3. Chernysheva M.G. et al. Col loids Surfaces A: Physicochem. Eng. Asp. 565\, 25 (2019).\n\nhttps://event s.sinp.msu.ru/event/8/contributions/535/ LOCATION: Физический ф-т\, ауд. 5-19 URL:https://events.sinp.msu.ru/event/8/contributions/535/ END:VEVENT BEGIN:VEVENT SUMMARY:APPLICATION OF TRITIUM LABEL FOR THE DETECTION OF NANODIAMOND FILM S ON THE SURFACE OF COLLAGEN TISSUE DTSTART;VALUE=DATE-TIME:20220713T141000Z DTEND;VALUE=DATE-TIME:20220713T143000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-473@events.sinp.msu.ru DESCRIPTION:Speakers: Tianyi Shen (Lomonosov Moscow State University)\nBio prosthetic heart valves based on bovine pericardium are widely used in the field of cardiac surgery worldwide. The main component of bovine pericard ium is collagen tissue that is treated with chemical agents to prevent cal cification and preserve the elastic properties of the biological tissue. I n the present study we tried to improve the mechanical properties of biolo gical tissue by application of additional nanodiamond-based coating and ch aracterized the coating by means of radiotracer method.\nNanodiamonds show high potential application as a drug carrier because of functionally deve loped surface as well as high specific surface. Moreover\, it is possible to introduce tritium label directly bonded with diamond surface by means o f tritium thermal activation method. In the present research we used triti um labeled nanodiamonds to measure its mass on the surface of collagen tis sue and nanodiamond-based coating stability in vivo. \nThe other problem o f xenogenic heart valve prostheses is the development of disease caused by microorganisms. From this view point nanodiamonds can be consider as a ca rrier of drugs of prologue action. Here we used amikacin and levofloxacin\ , which were labeled with tritium for determination of its adsorption and desorption from nanodiamond surface in vitro and in vivo. Peculiarities of nanodiamond-antibiotic adsorption complexes formation and its application onto collagen tissue will be discussed in the presentation.\nTo prevent c alcification process collagen tissue must be coated with biopolymer like c hitosan. Tritium labeled chitosan was used for coating characterization in the experiments in vitro and in vivo.\nThus\, preparation and characteriz ation of nanodiamond-antibiotic-chitosan coatings using tritium labeled co mpounds as well as improvement in the mechanical characteristics that can be reached with such prepared coatings will be discussed in the presentati on.\nThis research was funded by the Russian Science Foundation (grant num ber 22-23-00019).\n\nhttps://events.sinp.msu.ru/event/8/contributions/473/ LOCATION: Физический ф-т\, ауд. 5-19 URL:https://events.sinp.msu.ru/event/8/contributions/473/ END:VEVENT BEGIN:VEVENT SUMMARY:Using Tagged Neutron Method for On-line Analysis of Materials on C onveyor DTSTART;VALUE=DATE-TIME:20220713T132000Z DTEND;VALUE=DATE-TIME:20220713T134000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-288@events.sinp.msu.ru DESCRIPTION:Speakers: Albina Akhunova (Diamant LLC)\nThis paper discusses the application of the AGP-K conveyor analyzer to solve the problem of con trolling the elemental composition of material on the conveyor. The result of the analyzer operation is given and the obtained data are discussed.\n The results of using tagged neutron method for on-line analysis of materia ls on conveyor are presented. The method of tagged neutrons makes it possi ble to determine the concentrations of the desired elements inside objects contactless\, due to the large penetrating power of neutrons.\nThe Tagged Neutron Method consists in irradiating the object of analysis with beams of fast neutrons with an energy of 14\,1 MeV\, which are formed in the rea ction d + 3H → 4He + n. [1-3] In this reaction\, the neutron and the α- particle fly apart in almost opposite directions. Therefore\, by registeri ng the α-particle accompanying the neutron\, it is possible to determine the direction of neutron departure. This procedure is called tagging of ne utron. A fast neutron with an energy of 14\,1 MeV enters the substance of the object and interacts with the nuclei of the substance in inelastic sca ttering reactions (n\, n'γ). Since each chemical element has its own char acteristic gamma spectrum\, it is possible to conduct an elemental analysi s of the object under study.\nIrradiation of the material on the conveyor occurs by a beam of fast tagged neutrons with an energy of 14 MeV from the ING-27 portable neutron generator manufactured by NL Dukhov All-Russian S cientific Research Institute of Automation (VNIIA)\, gamma quanta from ine lastic scattering reactions are recorded by a system of 14 scintillation d etectors based on a BGO crystal. Tagged neutron is carried out by registra tion of α-particles formed in the reaction d+3H →4He+n\, which makes it possible to reduce the influence of the background by 200 times. The anal yzer also includes power systems\, data collection systems and biological protection.\nThe analyzer provides data on the elemental composition of ma terial on the conveyor every 40-60 seconds. The results of the analyzer op eration for control of sinter are discussed. \n1. V. Valkovic\, «14 MeV N eutrons: Physics and Applications»\, Taylor & Francis Group\, 2016\, 516 p.\n2. Alexakhin V.Y. et al.\, «Detection of Diamonds in Kimberlite by t he Tagged Neutron Method.»\, Nuclear Instruments and Methods" A785\, 2015 \, 9 p.\n3. V.M. Bystritsky et al.\, «Physics of Particles and Nuclei Le tters»\, 2008\, Volume 5\, p.441.\n\nhttps://events.sinp.msu.ru/event/8/c ontributions/288/ LOCATION: Физический ф-т\, 5-19 URL:https://events.sinp.msu.ru/event/8/contributions/288/ END:VEVENT BEGIN:VEVENT SUMMARY:Measurement of yields and angular distributions of γ-quanta from the interaction of 14.1 MeV neutrons with oxygen\, phosphorus and sulfur n uclei DTSTART;VALUE=DATE-TIME:20220713T130000Z DTEND;VALUE=DATE-TIME:20220713T132000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-345@events.sinp.msu.ru DESCRIPTION:Speakers: Dimitar Grozdanov ()\nThe study of inelastic scatter ing of fast neutrons by atomic nuclei is of great importance for fundament al and applied neutron-nuclear physics. Reactions induced by neutrons are the unique source of information for describing the processes of strong in teraction between nucleons. Inelastic scattering processes are used to stu dy the characteristics of excited states of target nuclei [1]. The practic al use of the (n\,n'γ) reaction requires the expansion and refinement of experimental data on this process. Research on the inelastic scattering of fast neutrons has recently become more active in connection with new pros pects for the production of nuclear energy using fast neutron reactors.\nT he purpose of the experiment was to refine the available data on the yield s and angular distributions of γ-rays from inelastic scattering of 14.1 M eV neutrons by natural composition of oxygen\, phosphorus and sulfur nucle i. The work was carried out within the framework of the scientific program of the international TANGRA (TAgged Neutrons and Gamma RAys) project at F rank Laboratory of Neutron Physics of the Joint Institute for Nuclear Rese arch in Dubna (Russia).\nInelastic scattering was studied by the Tagged Ne utron Method [2]\, in which neutrons with an energy of 14.1 MeV produced i n the d(t\,a)n reaction are “tagged” by detecting alpha particles. Gam ma quanta from the (n\,n'γ) reaction were recorded by the “Romasha” m ultidetector system [3]. Experimental data are shown and discussed in comp arison with previously published data.\n\n 1. W. Hauser and H. Feshbach . The Inelastic Scattering of Neutrons\, Phys. Rev.\, 1952\, vol. 87\, p. 366.\, https://doi.org/10.1103/PhysRev.87.366\n 2. I.N. Ruskov\, Yu.N. Kopatch\, V.M. Bystritsky et al. Physics Procedia\, vol. 64\, 2015\, pp. 1 63-170\, ISSN 1875-3892\, https://doi.org/10.1016/j.phpro.2015.04.022.\n 3. D.N. Grozdanov\, N.A. Fedorov\, Yu.N. Kopatch et al. IJPAP vol. 58(05 )\, pp. 427-430\, 2020\, http://nopr.niscair.res.in/handle/123456789/54739 .\n\nhttps://events.sinp.msu.ru/event/8/contributions/345/ LOCATION: Физический ф-т\, 5-19 URL:https://events.sinp.msu.ru/event/8/contributions/345/ END:VEVENT BEGIN:VEVENT SUMMARY:USING THE TAGGED NEUTRON METHOD FOR DETERMINING THE CONCENTRATION OF CARBON IN SOIL DTSTART;VALUE=DATE-TIME:20220713T124000Z DTEND;VALUE=DATE-TIME:20220713T130000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-520@events.sinp.msu.ru DESCRIPTION:Speakers: Yuri Kopatch (JINR)\nMonitoring the content of soil organic carbon (SOC) is one of the most important tasks in the field of gl obal climate change\, in the development and implementation of measures ai med at reducing greenhouse gas emissions [1].\nExisting methods of soil an alysis [2] mainly involve the selection of bulk samples and work in the la boratory\, which leads to a significant complication of obtaining analytic al results\, to additional use of human and time resources\, and in some c ases to the unreliability and insufficient accuracy of the data obtained.\ nThe tagged neutron method (TNM) [3\, 4] can be used for fast nondestructi ve elemental analysis of various substances and materials\, in particular\ , without sampling. The method uses neutrons with an energy of 14.1 MeV\, which have a high penetrating power. An important advantage of the method is the possibility of using portable tagged neutron generators\, which mak es it possible to carry out field measurements.\nWe present some results o f test measurements and model simulations\, which will help to assess the accuracy limits of the method in terms of reproducibility and repeatabilit y of determining the carbon content in mock soil samples using TNM.\n\n 1. Lal\, R.: Soil carbon management and climate change\, Carbon Manage.\, 4 (2013) 439–462\, https://doi.org/10.4155/cmt.13.31.\n 2. England J .R. and Viscarra Rossel R.A.\, SOIL\, 4 (2018) 101–122\, https://doi.org /10.5194/soil-4-101-2018.\n 3. Valkovic V.\, 14 MeV Neutrons: Physics a nd Applications. CRC Press: Taylor & Francis Group\; 2016\, 481p.\n 4. Galina Yakubova\, Aleksandr Kavetskiy\, Stephen A. Prior\, H. Allen Torber t\, Tagged neutron method for carbon analysis of large soil samples\, Appl ied Radiation and Isotopes\, Volume 150 (2019)12134\, ISSN 0969-8043 \, https://doi.org/10.1016/j.apradiso.2019.05.028.\n\nhttps://events.sinp. msu.ru/event/8/contributions/520/ LOCATION: Физический ф-т\, 5-19 URL:https://events.sinp.msu.ru/event/8/contributions/520/ END:VEVENT BEGIN:VEVENT SUMMARY:Influence of neutron detector structural materials on fast neutron detection DTSTART;VALUE=DATE-TIME:20220713T122000Z DTEND;VALUE=DATE-TIME:20220713T124000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-267@events.sinp.msu.ru DESCRIPTION:Speakers: Sergey Karaevsky (INR RAS)\nSome nuclear reactions o n nuclei in neutron detector structural details even so as aluminium are i nduced with energy increasing. Nuclear reactions induced by neutrons betwe en 5 and 20 MeV energy are under consideration. They causes background eve nts in gaseous and scintillation detectors with $^3$He\, $^7$Li and $^10$B isotopes. The events and neatron scattering and nucleus activation distur bs measurement results\, leads to detector excitation without neutrons.\n Interaction of neutron with an energy of more than 5 MeV with aluminum\, silicon and oxygen nuclei as the main materials of new position-sensitive detector is considered. Interaction of neutron with converter nuclei: $^3$ He\, $^7$Li and $^10$B is considered also.\n\nhttps://events.sinp.msu.ru/e vent/8/contributions/267/ LOCATION: Физический ф-т\, 5-19 URL:https://events.sinp.msu.ru/event/8/contributions/267/ END:VEVENT BEGIN:VEVENT SUMMARY:Determination of the oxygen content in the investigated samples us ing delayed neutron counting technique DTSTART;VALUE=DATE-TIME:20220713T120000Z DTEND;VALUE=DATE-TIME:20220713T122000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-253@events.sinp.msu.ru DESCRIPTION:Speakers: Konstantin Mitrofanov ()\nIn the present work delaye d neutron registration technique have been applied to the issue of oxygen content definition in the samples of the known mass and morphology. For th is purpose the set up have been assembled on the neutron physical research channel of Tandem-3M accelerator of SSC RF–IPPE which consists of the c harged particles beam deflection system\, integrator of the current of cha rged particles hitting the neutron generating target\, primary neutron bea m monitor\, spectrometer of primary neutrons\, pneumatic transport system of the samples under investigation\, 4π-detector of neutrons\, constructe d on the base of helium-3 filled proportional counters and experiment cont rol system. Oxygen content have been determined using comparative analysis of the measurement results of the temporal dependences of delayed neutron intensity after irradiation of the control sample and investigated sample s in the fast neutron flux generated in the Li(d\,n) reaction from infinit ely thick lithium target. Experimental procedure due to the temporary natu re of delayed neutron emission phenomenon have been consisted in the carry ing out the cyclic consequence of the stages of sample irradiation by neut rons generated from the target\, sample movement to the neutron detector a nd the measurement of the temporal dependence of delayed neutron intensity .\n\nhttps://events.sinp.msu.ru/event/8/contributions/253/ LOCATION: Физический ф-т\, 5-19 URL:https://events.sinp.msu.ru/event/8/contributions/253/ END:VEVENT BEGIN:VEVENT SUMMARY:Compton scattering of entangled and decoherent annihilation photon s DTSTART;VALUE=DATE-TIME:20220712T153000Z DTEND;VALUE=DATE-TIME:20220712T155000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-369@events.sinp.msu.ru DESCRIPTION:Speakers: Sultan Musin (INR RAS(Moscow)\, MIPT(Moscow))\nAt pr esent\, positron emission tomography (PET) is one of the most effective in struments for the medical diagnostics. This method is based on detection o f two 511 keV gammas produced in positron-electron annihilation in organic tissue. According to the theory\, these annihilation photons are in enta ngled quantum state and have mutually perpendicular linear polarizations. This feature is suggested to be used in future generation of PET-scanners\ , where the angular correlations of scattered annihilation photons can be applied for suppression of backgrounds and improvement of image quality. I t is supposed that the angular correlations are quite different for the sc attered annihilation photons in entangled and decoherent quantum states th at allows the rejection of decoherent photons and hence to improve the sig nal/noise factor. Nevertheless\, the experimental comparison of Compton sc attering of entangled and decoherent annihilation photons was not done til l now. We constructed the setup that allows the identification of the quan tum state and the study of angular correlations of scattered annihilation photons. First experimental results on Compton scattering of entangled and decoherent annihilation photons are presented.\n\nhttps://events.sinp.msu .ru/event/8/contributions/369/ LOCATION: Физический ф-т\, ауд. 5-42 URL:https://events.sinp.msu.ru/event/8/contributions/369/ END:VEVENT BEGIN:VEVENT SUMMARY:Relativistic runaway electron avalanche acceleration in complex th understorm electric structures DTSTART;VALUE=DATE-TIME:20220712T145000Z DTEND;VALUE=DATE-TIME:20220712T151000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-266@events.sinp.msu.ru DESCRIPTION:Speakers: Egor Stadnichuk (MIPT\, HSE University)\nThunderstor ms in the Earth’s atmosphere produce short and intense gamma-ray bursts [1]. Such bursts are called Terrestrial Gamma-ray Flashes (TGF). One of po ssible mechanisms of thunderstorm gamma-radiation – acceleration of Rela tivistic Runaway Electron Avalanches (RREA) in thunderstorm electric field s [2]. Gamma-rays are produced by relativistic electrons bremsstrahlung.\n RREAs are formed by secondary cosmic rays within thunderstorm media. In st rong electric fields RREAs are further multiplied by positive feedback mec hanisms\, which can lead to self-sustainable high-energy particles generat ion in thunderstorms (infinite feedback) [2\,3]. In complex thunderstorm e lectric structures RREAs are multiplied efficiently due to high-energy par ticles exchange (reactor feedback) between different electric regions (cel ls) [3].\nIn this research\, reactor feedback by runaway electron transpor t between cells is studied. It is shown that runaway electron propagation between cells with its further acceleration and multiplication plays an im portant role in the RREA dynamics. The conditions necessary for TGF by thi s mechanism are derived.\n\nhttps://events.sinp.msu.ru/event/8/contributio ns/266/ LOCATION: Физический ф-т\, ауд. 5-42 URL:https://events.sinp.msu.ru/event/8/contributions/266/ END:VEVENT BEGIN:VEVENT SUMMARY:INFINITE ELECTRON OSCILLATIONS NEAR THE CELL SEPARATOR IN THE SIMP LEST REACTOR DTSTART;VALUE=DATE-TIME:20220712T143000Z DTEND;VALUE=DATE-TIME:20220712T145000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-537@events.sinp.msu.ru DESCRIPTION:Speakers: Daria Zemlianskaya ()\nToday\, there are many unsolv ed mysteries in the physics of atmospheric lightning discharge. The unexpl ained phenomenon of atmospheric electricity is gamma-ray bursts observed s ince 1994 by space gamma-ray observatories (for example\, BATSE\, Fermi)\, created for observing gamma radiation from astrophysical sources. Mysteri ous natural gamma radiation of the earth's atmosphere is called Terrestria l Gamma-ray Flushes (TGFs). Long-term observation of TGF made it possible to establish that\, apparently\, this natural phenomenon is based on the a cceleration of relativistic electrons in the electric fields of thunderclo uds. Actually\, the fundamental phenomenon is the avalanche-like multiplic ation of fast electrons in matter. This phenomenon was proposed by Gurevic h [1]\, it is called runaway breakdown.\nIf we investigate the propagation of relativistic avalanches of runaway electrons at a sufficiently large v alue of the electric field in the case of two adjoining parts of the cloud with opposite directions of the electric field. In the simulation\, this configuration can be described as a system of two cells with different fie ld directions and called the simplest reactor. Under certain conditions of the system\, the initiation of feedback is possible. Electrons due to the presence of a field in the system will be accelerated\, and when they get into the field in the opposite direction\, they will turn. Along the way\ , they will emit gamma quanta\, on which the field does not act\, thus pla ying a key role in the formation of a non-stop process.\nIn this paper\, e lectrons were described that exist in the system and\, under the action of a field\, can begin to oscillate near the plane of separation of two cell s\, thereby maintaining feedback in the system of a simple reactor. This r elationship can exist even at small cell sizes and small margins. This mea ns that for the explosion criterion in a reactor\, not only the gamma feed back is essential\, but also electronic communication\, contributes to the development of gamma communication.\nThe purpose of this work was to stud y the process of gamma and electron multiplication for the simplest reacto r\, by modeling on GEANT4. The studies were carried out for particles with an energy of 5 MeV at a height of 10 km from the Earth's surface.\n\nhttp s://events.sinp.msu.ru/event/8/contributions/537/ LOCATION: Физический ф-т\, ауд. 5-42 URL:https://events.sinp.msu.ru/event/8/contributions/537/ END:VEVENT BEGIN:VEVENT SUMMARY:HIGH ENERGY IONOLUMINESCENCE DECAY IN Al2O3 DTSTART;VALUE=DATE-TIME:20220712T141000Z DTEND;VALUE=DATE-TIME:20220712T143000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-286@events.sinp.msu.ru DESCRIPTION:Speakers: Askar Issatov (Joint Institute for Nuclear Research\ , Flerov Laboratory of Nuclear Reactions)\nTime-resolved ion beam induced luminescence (ionoluminescence\, IL) measurements\, especially those when the luminescence decay is registered after single ion impact may be effici ently used for real-time characterization of irradiating materials. Tempor al resolution of single ion technique\, not limited by beam pulse duration has enabled to reveal new interesting features in dynamics of dense elect ronic excitations in vicinity of swift ion trajectory [1\,2]. The start pu lses in such experiments are produced using electron emission from carbon foils generated by incoming ion. In this report we present the design of t he IL detection system at IC-100 FLNR JINR cyclotron in which the start pu lses are formed using electron emission immediately from the target surfac e. Such approach allows to narrow the instrumental response function and m inimize inaccuracy in lifetime measurements arising due to dispersion in i on velocities. The experimental set-up has been used for studies of time-r esolved ionoluminescence of intact and pre-damaged Al2O3 single crystals d uring single 1.2 MeV/amu Ne\, Ar\, Kr and Xe ion impact.\n1. Kazuie Kimura \, Wan Hong\, Junichi Kaneko\, Noriaki Itoh\, Nucl Instr Meth B 141 (1998) 425-430.\n2. Kazuie Kimura\, Sumit Sharma\, Anatoli Popov\, Nucl Instr Me th B 191 (2002) 48–53.\n\nhttps://events.sinp.msu.ru/event/8/contributio ns/286/ LOCATION: Физический ф-т\, ауд. 5-42 URL:https://events.sinp.msu.ru/event/8/contributions/286/ END:VEVENT BEGIN:VEVENT SUMMARY:SEARCH CRITERIA FOR MINERAL DEPOSITS IN THE ZONES OF MODERN AND AN CIENT VOLCANISM ON URANIUM AND THORIUM AND THEIR FISSION PRODUCTS DTSTART;VALUE=DATE-TIME:20220712T132000Z DTEND;VALUE=DATE-TIME:20220712T134000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-496@events.sinp.msu.ru DESCRIPTION:Speakers: Adil Yafyasov (Spbgu)\nA.M. Yafyasov1\, F.F. Valiev1 \, I.R. Makarova2 S.A. Gorobets2\, \nV.O. Sergeev2\, N.A. Sukhanov\, D.K. Makarov3\nmakarova_i_r@mail.ru\n 1 - St. Petersburg State U niversity\, 2 - PETROFIZIK LLC \n\n\nIn the work\, by the method of gamma - spectroscopy [1\,2]\, new data are presented on the deep recharge of the Nizhnechutinsk oil field by ascending gases and hydrotherms with differen t elemental composition. It has been established that formation waters\, a s well as oils\, are enriched in As\, Br\, Ba\, Re\, Ir\, Au\, REE in the fluid replenishment zones. In this case\, the greatest differences relate to the distribution of uranium and thorium over the area of the deposit an d over the underlying oil reservoirs.\nThe results of the studies indicate the overlap and coexistence of deposits of hydrocarbons and ore minerals in the area of ancient volcanism\, while the criteria for the influence of the manifestation of deep processes are both the well-known ratios of ura nium and thorium (U/Th and/or Th/U) and the established we determined the values of the ratios Th/Ba\, Mo/U\, Ba/Mo. \nThe elements Ba and Mo are fi ssion products of uranium and thorium. In this regard\, we assume other ty pes of mineralization\, associated not with the release of magmas of diffe rent composition and post volcanic hydrotherms\, but with known exhalation mineralization. According to our ideas\, this type of mineralization is accompanied by a constant emanation of radioactive elements U\, Th and elements of their radioactive decay along the zones of development of mod ern and paleovolcanic formations. At the same time\, oils in the Upper Dev onian deposits are enriched in a number of elements\, the associations of which depend on the temperature of the ascending gas flows. Taking into ac count the results obtained\, the search for deposits of solid minerals and hydrocarbons is carried out not only in terms of U / Th\, but also accord ing to the new criteria we have established - certain values of the ratios Th / Ba\, Mo / U\, Ba / Mo in the composition of rocks and accumulations of hydrocarbons.\n\n\nLiterature\n\n1.Makarova I.R.\, Laptev N.N.\, Gorobe ts S.A.\, Valiev F.F.\, Yafyasov A.M.\, Sergeev V.O.\, Zippa A.I.\, Sukhan ov N.A.\, Makarov D. .K.\, Grishkanich AS/ Application of methods of gamma spectroscopy and IR spectroscopy for the purposes of prospecting geology. Georesources\, 2021\, No. 1. – P.17 – 29.\n2. Yafyasov A.M.\, Makaro va I.R.\, Valiev F.F\, Laptev N.N.\, Gorobets S.A.\, Sergeev V.O. / The ap plication of gamma-spectrometry with a germanium detector for oil and ore geology // Bulletin of the Russian Academy of Sciences : Physics\, 8 no. - T. 86. - 2022 (in print).\n\nhttps://events.sinp.msu.ru/event/8/contribut ions/496/ LOCATION: Физический ф-т\, ауд. 5-42 URL:https://events.sinp.msu.ru/event/8/contributions/496/ END:VEVENT BEGIN:VEVENT SUMMARY:Simple explanation of the experimental 57Fe Mӧssbauer isomer shi ft of iron compounds DTSTART;VALUE=DATE-TIME:20220712T130000Z DTEND;VALUE=DATE-TIME:20220712T132000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-482@events.sinp.msu.ru DESCRIPTION:Speakers: Sergey Dedushenko (Lyalin Pereulok 24/26-43\, Moscow 101000\, Russia)\nAccording to the existing concept\, an increase in elec tron density on 57Fe nucleus must lead to a decrease in Mӧssbauer isomer shift (IS). The rise of oxidation state of iron (escape of electrons from the valence shell) usually leads to the decrease in IS\, which is explaine d by the shielding effects. \nWe suggest applying the approach of the vale nce shell hybridization to explain the regularities of the IS change [1]. It is easy to show that two electrons on 4s-orbital create the electron de nsity at the iron nucleus\, which is equivalent to the density created by the full set of fully filled 4s4pn3dm-hybridized orbitals:\n|ψ_s (0)|^2= ∑_(i=1)^(1+n+m)▒|_(sp^n ⅆ^m)^((i) ) (0)|^2 \,\nwhere n = 0…3 an d m = 0…5 are the numbers of the 4p and 3d-orbitals involved in the hybr idization. Using this property\, we can suggest that the directional chemi cal bonds\, which iron cation establishes with surrounding anions\, influe nce on the IS\; this influence being independent on the number of the bond s. Assuming that the IS is proportional to the average bond length\, we ca n explain the observed experimental dependencies. At the same time\, d and p-electrons do not create a density on the nucleus. But they affect the i onic radius of the iron ion and\, consequently\, affect the interatomic di stances. Moreover\, we concluded that the electron shell of each anion of the iron polyhedron can make noticeable additional contribution to the ele ctron density at the iron nucleus. This makes it possible to explain the d ependence of the IS on the iron coordination number.\n\nhttps://events.sin p.msu.ru/event/8/contributions/482/ LOCATION: Физический ф-т\, ауд. 5-42 URL:https://events.sinp.msu.ru/event/8/contributions/482/ END:VEVENT BEGIN:VEVENT SUMMARY:THERMOLUMINESCENCE TRAPPING PARAMETERS OF IRRADIATED K-FELDSPAR DTSTART;VALUE=DATE-TIME:20220712T124000Z DTEND;VALUE=DATE-TIME:20220712T130000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-418@events.sinp.msu.ru DESCRIPTION:Speakers: Sahib Mammadov (Institute of Radiation Problems\, Az erbaijan National Academy of Sciences)\nIsothermal decay of TL glow curve of the irradiated K-feldspars has been investigated at an ambient temperat ure. A suggested procedure enables the isolation of peaks at the low-tempe rature region of the TL glow curve. An analysis of the values of the symme try factor suggests that bimolecular mechanisms are responsible for the ki netics of decay processes\, as the values of parameter µ [1] vary around 0.52. The values of the calculated activation energy do not show systemati c correlation with the temperature at the investigated temperature region of TL glow curve. The frequency factor values of the isolated peaks change within the physically meaningful figures (within the order of 109 to 1013 s-1) and in good agreement with the literature [1]. ESR and TL investigati ons revealed that [2]\, when feldspars such as microcline and albite are i rradiated at liquid nitrogen temperature\, both Al-Oh+ and a hydrogen radi cals are formed. As soon as the temperature of the samples rises to room t emperature\, the hydrogen radical eliminates completely and Al-Oh + -Al ce nters appear. Thermal annealing at 1000 ° C leads to the formation of two new hydrogen radicals which are relatively stable even at room temperatur e. It has been suggested that they could act as killers for Al-Oh + -Al ce nters in both feldspars which might be the case in the current situation.\ n\nReferences\n[1] R. Chen\, V. Pagonis\, and J. L. Lawless\, “Evaluated thermoluminescence trapping parameters-What do they really mean?\,” Rad iat. Meas.\, vol. 91\, pp. 21–27\, 2016\, doi: 10.1016/j.radmeas.2016.04 .006.\n[2] T. Hashimoto\, E. Nishiyama\, and Y. Yanagawa\, “Radiation-in duced luminescence and hydrogen radical formation associated with thermal annealing treatments on feldspars\,” J. Radioanal. Nucl. Chem.\, vol. 25 5\, no. 1\, pp. 81–85\, 2003\, doi: 10.1023/A:1022275630127.\n\nhttps:// events.sinp.msu.ru/event/8/contributions/418/ LOCATION: Физический ф-т\, ауд. 5-42 URL:https://events.sinp.msu.ru/event/8/contributions/418/ END:VEVENT BEGIN:VEVENT SUMMARY:Method for processing and analysis of homogeneity of large sets of small-volume samples of low-intensity radiation streams DTSTART;VALUE=DATE-TIME:20220712T123000Z DTEND;VALUE=DATE-TIME:20220712T124000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-305@events.sinp.msu.ru DESCRIPTION:Speakers: Victor Vakhtel (Voronezh State University)\nMethod f or processing and analysis of homogeneity of large sets of small-volume sa mples of low-intensity radiation streams.\n\nRabotkin V. A.\, Bliznyakov N .M.\, Vakhtel V.M.\, Kostomakha D.E.\nVoronezh State University\, Voronezh \, Russia\nE-mail: vakhtel@phys.vsu.ru\n\nA method for processing and anal yzing sequences of samples of variation series of values of identifiers I( ν(.)) of random vectors (RV) - ν for their corresponding samples of smal l volume n≤20 of counts k_i=0\;1\;2… of registered particles was propo sed. The identifier I(ν(.)) is a functional in the form of a scalar produ ct RV ν(.)=〖(ν〗_0\,ν_1\,…\,ν_l) of frequencies ν_i (k=i) of val ues of counts k_i in the sample\n∑_0^l▒〖ν_i=n<20: I(ν)=I(ν|a)=( νa)=ν_0 a_0+⋯+〗 ν_l a_l\nwhere a=〖(a〗_0\,…\,a_l) – is not a randomly given vector. For a given number M of vectors ν(.) the frequenc y distribution of I(ν) values represents sequences of ordered groups of p eaks formed by:\n similar in components ν_i RV\n of homogeneous peaks for med by homogeneous RVs.\nTo evaluate the homogeneity of RV and peaks\, it was proposed a test statistic G and a criterion of agreement based on the metric\nG=1/q [∑_(l=1)^l▒〖[(x_im-x_ir )/(x_im+x_ir )^2]〗]^(1/2)\,0 ≤G≤1.\nIt was shown that the homogeneity estimation of peaks considere d also as random vectors m and rM_(1\,m)\,M_(2\,m)\,…\,M_(l\,m)\;M_(1\,r )\,M_(2\,r)\,…\,M_(l\,r) can be performed by the degree of their colline arity |M_m | |M_l |^(-1)∙M_m∙M_l=cosθ\, where θ-is the angle between vectors and equality of |M_m |=|M_r | modules.\nThe proposed method allow s identifying combinatorial types of RV\, predicting frequencies of their realization 1\n\nhttps://events.sinp.msu.ru/event/8/contributions/305/ LOCATION: Физический ф-т\, ауд. 5-42 URL:https://events.sinp.msu.ru/event/8/contributions/305/ END:VEVENT BEGIN:VEVENT SUMMARY:Estimation of the degree of agreement of empirical random vectors using central moment functions DTSTART;VALUE=DATE-TIME:20220712T122000Z DTEND;VALUE=DATE-TIME:20220712T123000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-509@events.sinp.msu.ru DESCRIPTION:Speakers: Victor Vakhtel (Voronezh State University)\, Daniil Kostomakha (Voronezh State University)\nEstimation of the degree of agreem ent of empirical random vectors using central moment functions.\n\nRabotki n V. A.\, Bliznyakov N.M.\, Vakhtel V.M.\, Kostomakha D.E.\nVoronezh State University\, Voronezh\, Russia\nE-mail: vakhtel@phys.vsu.ru\n\n\nA method ology for estimating the degree of agreement M of empirical random vectors (RV):ν(k)=〖(ν〗_0\,ν_1\,…\,ν_l) of frequenciesν_i (k=i) of coun ts k of registered particles by samples of small volume\n∑_0^l▒〖ν_i =n<20〗\,0≤ν_i≤n\nand average ( k) ̅<5 was developed.\nThe degree o f agreement of the vectors is estimated by the test statistics of the clos eness of the projections of the fractional order functions 1\n\nhttps://ev ents.sinp.msu.ru/event/8/contributions/509/ LOCATION: Физический ф-т\, ауд. 5-42 URL:https://events.sinp.msu.ru/event/8/contributions/509/ END:VEVENT BEGIN:VEVENT SUMMARY:TARGET DESIGN FOR EXPERIMENTAL INVESTIGATION OF ADS WITH PROTON AN D LIGHT ION BEAMS DTSTART;VALUE=DATE-TIME:20220712T120000Z DTEND;VALUE=DATE-TIME:20220712T122000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-541@events.sinp.msu.ru DESCRIPTION:Speakers: Mihaela Paraipan ()\nA particle accelerator coupled with a subcritical fission reactor (accelerator driven system - ADS) can r ealize a safe\, clean and efficient source of energy. We showed that in sp ite of the majority’s opinion with respect to the optimal beam for ADS ( considered to be proton with energy 1-1.5 GeV) light ion beams at lower en ergies are more efficient [1-3]. Aspects related with the core structure a nd composition\, the optimal value of the criticality coefficient keff\, t he particle beam and the accelerator type were analyzed. The larger pitch to diameter ratio possible to achieve in ADS (~2 for a core cooled with le ad or lead bismuth eutectic - LBE) allows to accommodate higher power dens ities\, keeping the coolant velocity below 2 m/s in order to minimize the corrosion effects on the cladding and structural materials. The role of a Be converter with large dimensions (radius 10-20 cm\, length 100-120 cm) i s emphasized. In the presence of a long Be converter a beam of 7Li with en ergy 0.2 AGeV is equivalent from the point of view of the net power produc ed with a beam of 1 GeV proton\, and a beam of 0.25 AGeV 7Li is equivalent with a beam of 1.5 GeV protons. This allows to obtain the same net power with a 2.5 times shorter accelerator with lower cost for the power plant b uilding and maintenance. The apparition of a tail towards thermal energy i n the neutron spectrum allows to obtain the needed value of the criticalit y coefficient keff in a given geometry with a lower enrichment\, increases the breeding capability of the core and ensures a deeper burning of the a ctinides in one cycle. Until 25 % of the actinides can be fissioned in one cycle in ADS with Be converter in comparison with 6-7 % that can be achie ved in a fast reactor. The analysis of the power evolution after beam stop ping and the investigation of possible insertions of positive reactivity d uring transients concluded that metallic fuel allows a core with keff 0.98 8\, when fuels with melting temperature higher than the clad (as oxide\, c arbide\, nitride) needs a lower value of 0.985 for keff. The maximum energ y gain of protons is obtained at 1.5 GeV when they are accelerated in a li nac (G ~14)\, and at lower energy (0.75-1 GeV) when a cyclotron is used. I n both situations ion beams starting with 4He realize higher energy gain t han protons. Ion beams offer the possibility to obtain energy gain from 25 (with 0.25AGeV 7Li beam) to 45 (with 0.75 AGeV 16O and 20Ne beam).\nA pro posal for the design of a target dedicated to the experimental study is pr esented. The design of the experimental target must reproduce at a small s cale the situation in a real ADS. The interest is to determine the minimal dimensions and minimal amount of fuel necessary for a correct reproductio n of the ratio of the energy released (amount of fissions) produced with p roton and ion beams. Two designs are analyzed. In the first\, the target c onsists of rods from enriched U (15 % 235U) with diameter 2 cm and length 120 cm\, distributed in 6 layers (~200 rods) inside a cylinder from Pb wit h length 150 cm and radius 70 cm. The central part of cylinder is empty\, allowing the placement of different converters. In the second variant the rods are placed in a graphite target\, surrounded by a 10 cm Pb blanket. D ue to the softer neutron spectrum\, the use of graphite target allows to d iminish significantly the number of fuel rods (~20 rods with 15 % 235U). \ n\nReferences:\n1. M. M. Paraipan\, A. A. Baldin\, E. G. Baldina\, S. I. T yutyunnikov\, EPJ proceedings MMCP2017\, 173 (2017).\n2. M. M. Paraipan\, V. M. Javadova\, S. I. Tyutyunnikov\, Prog. Nucl. En. 120 (2020).\n3. M. M . Paraipan\, I. A. Kryachko\, V. M. Javadova\, E. Levterova\, S. I. Tyutyu nnikov\, Phys. Part. Nucl. Lett. 19\, 2 (2022).\n\nhttps://events.sinp.msu .ru/event/8/contributions/541/ LOCATION: Физический ф-т\, ауд. 5-42 URL:https://events.sinp.msu.ru/event/8/contributions/541/ END:VEVENT BEGIN:VEVENT SUMMARY:Validation of nuclear de-excitation models of Geant4 toolkit DTSTART;VALUE=DATE-TIME:20220712T103500Z DTEND;VALUE=DATE-TIME:20220712T105500Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-202@events.sinp.msu.ru DESCRIPTION:Speakers: Roman Nepeivoda (INR\, Moscow and MIPT)\nGeant4 is a powerful Monte Carlo modeling toolkit [1] to describe the propagation and interactions of particles and nuclei in various media. It was originally designed for experiments at the LHC\, but its area of application is rapid ly extending well beyond high energy physics to low energy nuclear physics \, astrophysics\, space science\, medical physics and radiation protection [2]. \n\nNuclear reactions induced by hadrons and nuclei are modeled by G eant4 as multistage processes. In particular\, the Binary Cascade (BIC) [3 ] and Liege Intranuclear Cascade (INCL) [4] models are used to simulate th e emission of fast particles at the first cascade stage resulting in an ex ited nuclear residue. Depending on the excitation energy calculated per nu cleon of the residual nucleus E*/A various decay processes take place. At E*/A<2 MeV the evaporation of neutrons\, protons and alpha-particles from residual nuclei [5] is modeled\, while the Statistical Multifragmentation Model (SMM) [6] is employed to simulate the decays into nucleons and multi ple nuclear fragments at higher excitation energies. Nuclear de-excitation models of Geant4 were validated in its early version of 9.1 [7].\n\nIn th e present work we validate nuclear de-excitation models of recent Geant4 v ersions 10.4 and 11.0 by means of standalone tests for specific residual n uclei and excitation energies. Calculation results are compared to measure d energy spectra of evaporated neutrons\, protons and alpha-particles [8] and to charge distributions of secondary fragments calculated with FORTRAN version of SMM [6]. A detailed analysis of the momentum distributions of SMM products is performed and several suggestions to improve the results o f the modeling were reported to Geant4 developers. After the revisions\, t he latest versions of de-excitation models of Geant4 can be used in our Ab rasion-Ablation Monte Carlo for Colliders model (AAMCC) [9] to simulate th e properties of spectator matter in collisions of relativistic nuclei. \n[ 1] J. Allison et al.\, Nucl. Sci. IEEE Trans. 53 (2006) 270\n[2] J. Alliso n et al.\, Nucl. Inst. Meth. A 835 (2016) 186\n[3] G. Folger\, V. Ivanchen ko\, H. Wellisch. Eur. Phys. J. A. 21 (2004) 407\n[4] S. Leray et al.\, Nu cl. Data Sheets 118 (2014) 312\n[5] V.Weisskopf\, Phys. Rev. 52 (1937) 295 \n[6] A.S. Botvina et al.\, Nucl. Phys. A. 584 (1995) 737\n[7] I.A. Psheni chnov et al.\, Nucl. Inst. Meth. B 268 (2010) 604\n[8] R.J. Charity\, Phys . Rev. C 82 (2010) 014610\n[9] R. Nepeivoda et al.\, Particles 5 (2022) 40 \n\nhttps://events.sinp.msu.ru/event/8/contributions/202/ LOCATION: Физический ф-т\, ауд. 5-42 URL:https://events.sinp.msu.ru/event/8/contributions/202/ END:VEVENT BEGIN:VEVENT SUMMARY:TO TESTING OF THRESHOLD SILICA AEROGEL CHERENKOV DETECTORS ON COSM IC RAYS DTSTART;VALUE=DATE-TIME:20220712T093500Z DTEND;VALUE=DATE-TIME:20220712T095500Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-434@events.sinp.msu.ru DESCRIPTION:Speakers: Leonid Dzhilavyan (Institute for Nuclear Research of the Russian Academy of Sciences)\nAt present\, threshold aerogel Cherenko v detectors based on SiO2 with chosen refractive indices (hereinafter refe rred to as “threshold detectors”) are widely used for studies in physi cs of elementary particles (in particular\, for separating charged pions a nd kaons\, see about it\, e.g.\, in [1] and in references therein). Since the number of Cherenkov photons is small compared to that from scintillato rs\, it is required to test such threshold detectors and measure their sig nificant characteristics on accelerator beams and / or on cosmic rays. In our case\, the detector\, when the entire aerogel block is viewed by a set of photomultiplier tubes (PMTs)\, such characteristics are the distributi on of the number of “activated” PMTs\, the total detection efficiency\ , etc.\nUsually (see\, e.g.\, [1])\, at cosmic ray testing of some thresho ld detector\, several horizontal plastics (viewed by their PMTs) form tele scope around vertical axis. Signals from these detectors are used as a tri gger for testing of the threshold detector placed on the same axis. In [1] \, layers of Pb with additional plastic detectors behind each Pb layer are installed ahead and behind the tested threshold detector to separate part icles with energies higher than thresholds for production of Cherenkov rad iation. However\, because of complicated content of incident cosmic rays\, initial distributions of their energies\, and spreads of ionization losse s\, there are restrictions on definiteness of energies (and velocities) of the registered particles (mostly muons). Moreover\, such testing installa tions are rather bulky and heavy.\nIn the present work instead of layers o f Pb\, we added to trigger detectors the small threshold detector which ma de from the same aerogel as the tested detector\, installed just behind th e tested detector\, viewed by single PMT of the same type as for the teste d threshold detector\, and plays the role of Cherenkov monitor with its to tal detection efficiency close to 100%. This efficiency level is ensured b y the small sizes of the aerogel (5 x 5 x 9 cm3) and of the PMT photocatho de diameter (~5 cm). In our case\, the number of Cherenkov photons in the photocathode sensitivity region (260 nm – 610 nm) generated by a muon in the Cherenkov monitor is about 200. Due to the small sizes of the monitor \, a sufficient number of photons always hit the PMT photocathode for a si gnal to appear even when using PMTs with moderate quantum efficiency.\n\n 1. A.R. Buzykaev. Development of Cherenkov ASHPH counters for the KEDR det ector. The candidate of sciences (physics – mathematics) dissertation. B udker Institute of Nuclear Physics. Novosibirsk. 2017.\n\nhttps://events.s inp.msu.ru/event/8/contributions/434/ LOCATION: Физический ф-т\, ауд. 5-42 URL:https://events.sinp.msu.ru/event/8/contributions/434/ END:VEVENT BEGIN:VEVENT SUMMARY:CALIBRATION OF RADIOISOTOPE DEVICES DTSTART;VALUE=DATE-TIME:20220712T091000Z DTEND;VALUE=DATE-TIME:20220712T093500Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-580@events.sinp.msu.ru DESCRIPTION:Speakers: Ulugbek Ashrapov (senior scientific researcher)\nIn paper considered development method calibration radioisopote densitometer amd radioisotope level gauges in laboratory conditions.The tightness of Cs -137 closed radiation ionization sources was made by the immersion method. The radioisotope densitometers (Endress+Hauser AG\, Switzerland) was cali brated using a special technique with using metal calibration container wi th liquid imitators based on a mixture of bromoform and ethyl alcohol havi ng different densities. The radioisotope level gauge (Mesacon Messelektron ik\, GmbH Dresden) on a special stand using a mixture of bromoform and eth anol was calibrated.\n\nhttps://events.sinp.msu.ru/event/8/contributions/5 80/ LOCATION: Физический ф-т\, ауд. 5-42 URL:https://events.sinp.msu.ru/event/8/contributions/580/ END:VEVENT BEGIN:VEVENT SUMMARY:Perspectives of inorganic scintillator GAGG application for pre cision electromagnetic calorimetry DTSTART;VALUE=DATE-TIME:20220712T082000Z DTEND;VALUE=DATE-TIME:20220712T084000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-217@events.sinp.msu.ru DESCRIPTION:Speakers: Dmitry Averyanov (NRC "Kurchatov Institute")\nScinti llation crystals made of a new promising material Gd₃Al₂Ga₃O₁₂ ( GAGG) are considered because of their high radiation resistance\, density and light yield [1\, 2].These crystals can be used in addition to lead tun gstate (PbWO4) crystals for development of a new generation electromagneti c calorimeter with good spatial and energy resolutions in a wide energy ra nge. PbWO4 crystals enable accurate detection of high energy photons\, whi le the addition of GAGG crystals makes it possible to precisely measure ph oton energies down to a few MeV.\n Different options of composite electr omagnetic calorimeter based on PWO and GAGG crystals are considered to opt imise spatial and energy resolutions in a wide energy range (from 1 MeV to 100 GeV). Optimisation is based on GEANT4 simulations with accounting of light collection using different photodetectors and a noise of electronics . The simulations are verified using measurements of GAGG samples obtained with radioactive sources and test beam measurements of PbWO4 based Photon Spectrometer of the ALICE experiment at CERN [3].\n1. K. Kamada\, T. Yana gida [et al.]\, IEEE trans. on nuclear science 59(5):2112-2115 (2012)\n2. Y. Zhu\, S.Qian [et al.]\, Optical Materials 105\, 109964 (2020)\n3. D.V. Aleksandrov [et al.]\, Nucl. Instrum. Meth. A550\, 169–184 (2005)\n\nhtt ps://events.sinp.msu.ru/event/8/contributions/217/ LOCATION: Физический ф-т\, ауд. 5-42 URL:https://events.sinp.msu.ru/event/8/contributions/217/ END:VEVENT BEGIN:VEVENT SUMMARY:CONJUGATE OBJECTS IN QUANTUM COMMUNICATION DTSTART;VALUE=DATE-TIME:20220712T080000Z DTEND;VALUE=DATE-TIME:20220712T082000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-299@events.sinp.msu.ru DESCRIPTION:Speakers: Айрат Ситдиков (Россия)\n**CONJUG ATE OBJECTS IN QUANTUM COMMUNICATION**\n\nA. S. Sitdikov1\,2\, A.S. Nikiti n1\n1 Kazan State Power Engineering University\, Kazan\, Russia\;\n 2Kazan (Volga region) Federal University\, Kazan\, Russia\n E-mail: airat_vm@ram bler.ru \n\nThe basis of quantum communication is a set of methods for tra nsfer of information encoded with the help of quantum states of elementary particles. The carrier of a unit of quantum information in this case is a qubit - a two-level quantum system (a photon with vertical and horisontal polarizations\, an electron with two basic states\, an ion of a hydrogen molecule H+2 with basic states of electron localization at the first or se cond proton\, etc.). Nuclear objects - nucleons can also be considered as a qubit with two basic states in the isospin space.\n In [1]\, we construc t the algebraic model for the study of few-nucleon systems with non-abelia n superselection rules\, and in [2]\, this model was applied to describe t he transfer of quantum information in the presence of constraints by super selection rules by isospin. Isospin is a non-abelian charge and it is conv enient to describe such charges based on the framework symmetric tensor C* -categories. In [2]\, it was shown that the transmitted number of classica l messages encoded in qubits is equal to the number of coherent superselec tion sectors\, taking into account their multiplicity. Within the framewor k of algebraic model\, superselection sectors can be defined as a class of unitary equivalence of an irreducible endomorphism [ρ] (as an object of the C*-category) of the algebra of observables of the system. \n In the s tudy of the quantum communication\, as well as quantum cryptography\, due to the compensating property\, the conjugate charge also plays an importan t role. In this paper\, a study is carried out of conjugate superselection sectors [ρ]* corresponding to a conjugate object (charge) of the categor y. It is shown that the constructed conjugate object satisfies the require d conjugate equations. Classes of morphisms intertwining super-selection s ectors and certain functions over these morphisms are studied\, which allo w us to identify the properties of the conjugate charge generating certain superselection rules.\n\nhttps://events.sinp.msu.ru/event/8/contributions /299/ LOCATION: Физический ф-т\, ауд. 5-42 URL:https://events.sinp.msu.ru/event/8/contributions/299/ END:VEVENT BEGIN:VEVENT SUMMARY:LOOKING FOR AN ELECTRON BRIDGE IN 229mTh DTSTART;VALUE=DATE-TIME:20220712T074000Z DTEND;VALUE=DATE-TIME:20220712T080000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-273@events.sinp.msu.ru DESCRIPTION:Speakers: Andrey Popov (PNPI)\nThe isomeric state 229mTh has t he energy of 8.3(2) eV [1]. The small natural width and the location of th e transition in the optical range give hope for the use of this state as a n oscillator with a quality-factor several orders of magnitude higher than the Q-factor of the systems currently in operation.\nChanges in the elect ron shell with changes in the degree of ionization\, chemical environment\ , environmental parameters and the presence of external fields can have a significant impact on the probability of both discharge and settlement of the isomeric state through the mechanism of electronic bridges. Knowledge of the features of the decay of the isomer under the condition of the ener gy prohibition of direct electron emission will allow us to determine the optimal parameters of the feeding of the isomer using the electronic bridg e mechanism. The “tuning" of the electron shell can increase the probabi lity of isomer excitation by several orders of magnitude [2]. The probabil ity of discharge through electronic states is a good indicator for such ad justment.\nThe existing limitation on the lifetime of the isomer in a sing ly-charged thorium-229 (T1/2<10ms [3]) ion allows us to hope for using the lifetime of the isomeric state as an indicator of the width of the electr onic bridge.\nThe report presents the details of the preparation of an exp eriment to search for the decay of the isomeric state of thorium-229 throu gh the mechanism of an electronic bridge. The method [4\, 5] of formation of a beam of ions of the thorium isomer\, the scheme of ion transport and preparation of a thin source and registration of conversion electrons will be considered.\n\n1. B. Seiferle et al.\, Nature 573\, 238 (2019).\n2. F. F. Karpeshin\, M.B. Trzhaskovskaya Nucl. Phys. A 1010 (2021) 122173\n3. B. Seiferle\, et al.\, Phys. Rev. Lett. 118\, 042501 (2017)\n4. V. Sonnensch ein\, et al.\, Eur. Phys. J. A\, 2012\, vol. 48\, p. 52.\n5. Y.I. Gusev\, et al.\, Bull. Russ. Acad. Sci.: Phys.\, 2016\, vol. 80\, no.8\, p. 875.\n \nhttps://events.sinp.msu.ru/event/8/contributions/273/ LOCATION: Физический ф-т\, ауд. 5-42 URL:https://events.sinp.msu.ru/event/8/contributions/273/ END:VEVENT BEGIN:VEVENT SUMMARY:Flexible scenario for background suppression in heavy element rese arch DTSTART;VALUE=DATE-TIME:20220712T072000Z DTEND;VALUE=DATE-TIME:20220712T074000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-490@events.sinp.msu.ru DESCRIPTION:Speakers: Yury Tsyganov (JINR)\nNew algorithms to operate with new analog spectrometer of the DGFRS2 installed at DC-280 cyclotron setup are presented. The main goal of application of these algorithms is to sea rch an optimal time correlation recoil-alpha parameter directly during the acquisition C++ code execution. A new real-time flexible algorithm is pre sented in addition to the conventional ER-α one which is in use for a few years at the DGFRS1 setup installed at the U-400 FLNR cyclotron. Note tha t the spectrometer operates together with the 48×128 strip DSSD (Double S ide Strip Detector\; 48x226 mm$^2$) detector and low pressure pentane-fill ed gaseous detector (1.2 Torr\; 80x230 mm$^2$) are presented schematically . First beam test results in $^{48}$Ca induced nuclear reactions are pres ented too.\n\nhttps://events.sinp.msu.ru/event/8/contributions/490/ LOCATION: Физический ф-т\, ауд. 5-42 URL:https://events.sinp.msu.ru/event/8/contributions/490/ END:VEVENT BEGIN:VEVENT SUMMARY:Contacts for self-scanning SiC energyconverters in nano-microwatts range DTSTART;VALUE=DATE-TIME:20220712T070000Z DTEND;VALUE=DATE-TIME:20220712T072000Z DTSTAMP;VALUE=DATE-TIME:20260519T224947Z UID:indico-contribution-38-282@events.sinp.msu.ru DESCRIPTION:Speakers: Mikhail DOLGOPOLOV (Samara University)\nThe authors investigate the beta-electrons energy conversion into electrical energy in side 3C-SiC*/Si heterostructures doped with carbon-14 [1]\, which acts as an internal source of primary electrons spectrum and as the radioisotope n uclear energy accumulator. The question is raised in connection with the d escription of the endotaxy effectivness at the structural level\, which me ans the growth of the doped single-crystal film inheriting the crystallogr aphic orientation of the transformed Si-phase. The analysis of the technol ogical aspects of the formation by endotaxy of high-temperature stable and radiation resistant β-SiC/Si heterostructure with respect to the concent ration distribution of point defects of various nature\, deep centers [2] and their probable association models with the participation of an impurit y is the main way to increase the physical sensors reliability. The analys is of reversible association processes opens up ways to optimize the kinet ics of diffusion mass transfer and microalloying during the phase transfor mation of silicon substrate into the silicon carbide film [3]. The depende nces of the neutral defects concentrations on the factors of supersaturati on of the gas phase by the conditional atomic concentration of carbon\, on the concentration of impurities in the gas phase\, as well as on their ow n defects of various nature\, have the potential for the formation of deep levels in the forbidden zone and the potential for association [3]. The e fficiency of the created structures depends on the combination of radionuc lide activity and the formation of the contact area\, which is confirmed b y the beta spectrum research by the authors.\nThe dependence of the carrie r generation efficiency on the activity or the introduced concentration of the radioisotope in the crystal lattice\, taking into account the phase f ormation is evaluated. It is important to evaluate the possibility of stru ctures metallization in order to collect nonequilibrium charge carriers ta king into account changes in the work function. At this stage chips of str uctures with the size from 1x1 mm are used. At the same time\, it is impor tant to investigate the degree of influence of boundary effects. Research in the framework of this work also includes consideration of the band stru ctures of the device\, since there is an understanding of the alloying eff ect impurities with radionuclide on the position of energy levels in the b and structure.\n\n1. A. V. Gurskaya\, M. V. Dolgopolov\, V. I. Chepurnov\, Physics of Particles and Nuclei. 48\, 941 (2017).\n2. A. V. Gurskaya etc. J. of Physics: Conf. Series. 1686\, 012040 (2020).\n3. V. I. Chepurnov Ve stnik Samarskogo Gosudarstvennogo Universiteta. Estestvenno-Nauchnaya Seri ya. 7(118)\, 145 (2014)\n\nhttps://events.sinp.msu.ru/event/8/contribution s/282/ LOCATION: Физический ф-т\, ауд. 5-42 URL:https://events.sinp.msu.ru/event/8/contributions/282/ END:VEVENT END:VCALENDAR