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SUMMARY:CRYOGENIC GAS CATHER STOPPING ENERGY EFFICIENCY SIMULATION
DTSTART;VALUE=DATE-TIME:20220712T095000Z
DTEND;VALUE=DATE-TIME:20220712T101000Z
DTSTAMP;VALUE=DATE-TIME:20260813T215823Z
UID:indico-contribution-497@events.sinp.msu.ru
DESCRIPTION:Speakers: Alena Kohoutova (Joint Institute for Nuclear Researc
 h\, Flerov Laboratory of Nuclear Reactions\, Joliot Curie 6\, Dubna\, Mosc
 ow region\, 141980 Russia\; Faculty of Science of Palacký University Olom
 ouc\, 17. listopadu 1192/12\, 779 00 Olomouc\, Czech Republic)\nThe mass i
 s a fundamental property of an atom comprising all information on its cons
 tituents and their interactions. Thus\, it carries information on the inte
 rnal structure of the nucleus\, reveal the quantum mechanical shell struct
 ure within complex nuclei and determine the energy available for nuclear t
 ransformations in radioactive decay processes. Mass measurements allow us 
 to benchmark nuclear models and thus contribute to investigations of the n
 ature of the strong interaction itself. With the aim of high-precision mas
 s measurement (HPMM) of heavy and super heavy elements\, a new experimenta
 l setup is being built in FLNR\, Dubna. The setup consists of the followin
 g parts: target unit\; gas-filled separator of complete fusion reaction pr
 oducts\; cryogenic gas stopping cell (CGSC)\; a radio-frequency system for
  transporting and cooling a low-energy beam\; and a multi-reflection time 
 of flight mass spectrometer (MR-TOF MS). CGSC is responsible for the final
  slowing down and thermalizing the energy-bunched fragments produced and s
 elected in the Gas Filled Separator. The thermalization is achieved in a v
 olume filled with ultra-pure helium gas at cryogenic temperatures. After t
 he thermalization\, the fragments are extracted and transported with a rad
 io frequency quadrupole (RFQ) to the MR-TOF MS. The stopping and thermaliz
 ation of the incoming fusion-evaporation residuals (EVRs) is a key step in
  HPMM of the heaviest elements. Due to the typically low incoming ion rate
 s and low particle integrals CGSC has to be as efficient as possible. The 
 HPMM requires at least a few ions for a measurement any loss should be avo
 ided. The kinetic energy of the incident EVR\, the entrance window foil ty
 pe and thickness as well as the buffer-gas type and density of the CGSC co
 ndition the stopping efficiency. Only the ions that are stopped within the
  active gas volume of the CGSC can be extracted. The stopping efficiencies
  for EVRs cannot be tested on-line and one have to rely on simulations. To
  use the CGSC on ion beam the optimal entrance window foil thickness for e
 very reaction is necessary evaluate. The Geant4 and SRIM software packages
  was used in these simulations with different entrance window materials an
 d beam and target combinations.\n\nhttps://events.sinp.msu.ru/event/8/cont
 ributions/497/
LOCATION: Физический факультет\, СФА
URL:https://events.sinp.msu.ru/event/8/contributions/497/
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