11-16 July 2022
Europe/Moscow timezone
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Cross section of neutrino absorption by 82Se nuclei

15 Jul 2022, 11:20
20m
Физический ф-т, СФА

Физический ф-т, СФА

Ленинские Горы, д. 1, стр. 2
Oral talk (15 min + 5 min questions) Experimental and theoretical studies of nuclear reactions

Speaker

Dr Sergei Semenov (Russian Research Centre "Kurchatov Institute")

Description

Selenium-82 is a perspective isotope for neutrino investigations. Recently in experiments, produced with the help of NEMO-3 detector [1], which is composed of a tracker and a calorimeter, capable to reconstruct the full topology of  processes and measurements, performed at CUPID-0 setup [2], based on Zn82Se scintillating crystals, operated as cryogenic bolometers, nuclear mechanism of 82Se 22-decay have been examined. It was shown, that contribution of the single lowest excited 1+-level of intermediate nucleus 82Br dominates in the transition amplitude. It should be noted that for 82Se the quantum numbers of intermediate nucleus 82Br ground state are 5-, so transition via this state is strongly suppressed. Contribution of excited 1+ -states to 22-transition amplitude was considered in [3].
The lowest excited 1+-level of 82Br, Ex=75 keV, and corresponding Gamow-Teller strength have been determined in a high-resolution 82Se(3He,t) 82Br charge-exchange experiment [4]. Low value of threshold for neutrino absorption reaction together with considerable magnitude of transition strength to 75 keV (1+) state make 82Se to be interesting object both for solar neutrino detection and for measurements, aimed at investigation of new physics in calibration experiments.
The cross sections of absorption by 82Se nucleus of neutrinos, produced by artificial sources 51Cr, 37Ar, 65Zn are calculated. The parameters of experimental setup on the base 82Se for searching of new types of neutrino are discussed.

  1. R. Arnold et al , Eur. J. Phys. 78, 821 (2018)
  2. O. Azzolini et al, Phys. Rev. Lett. 123, 262501 (2019)
  3. S.V. Semenov, AIP Conf. Proc. 942, 67 (2007)
  4. D. Frekers et al, Phys. Rev. C 94, 014614 (2016)
Section 2. Experimental and theoretical studies of nuclear reactions
The speaker is a student or young scientist No

Primary author

Dr Sergei Semenov (Russian Research Centre "Kurchatov Institute")

Presentation Materials