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SUMMARY:Relations of isotope yields as an indicator of neutron fluxes in a
 rtificial rapid process
DTSTART;VALUE=DATE-TIME:20241024T064500Z
DTEND;VALUE=DATE-TIME:20241024T070000Z
DTSTAMP;VALUE=DATE-TIME:20260719T192054Z
UID:indico-contribution-4180@cern.ch
DESCRIPTION:Speakers: Vladimir Lyashuk (Institute for Nuclear Research of 
 the Russian Academy of Sciences)\nThe creation of heavy isotopes under ext
 remal pulsed neutron fluences (of $10^{24}$ n/cm$^2$ units) of artificial 
 nucleosynthesis is investigated by means of the dynamical model taking int
 o account the temperature decrease at the matter expansion.  The first tim
 e the creation of isotopes with neutron excess up to mass A = 255 was obta
 ined and discovered in the Mike experiment [1]. An intensive (n\,γ)-activ
 ation of the irradiated 238U target ensures the creation of neutron-rich i
 sotopes up to 257Fm. The rapid process is the consistent multiple neutron 
 capture in the target (manufactured from the 238U or more heavy/mixture is
 otopes as 232Th\, 237Np\, 238U\, 242Pu\, 243Am). Creation of transuranium 
 isotopes were investigated during the Plowshare program and some next nucl
 ear tests: Anacostia\, Kennebec\, Par\, Barbel\, Tweed\, Cyclamen\, Kankak
 ee\, Vulcan and Hutch [2-5].\nIn the realized model of the nucleosynthesis
  (realized during the short time exposition - ~$10^{-6}$ s) it were consid
 ered the sequential (n\,γ)-neutron captures by mono isotope 238U target a
 nd binary (238U + 239Pu)-variant for case of 239Pu injection [6\,7]. The m
 odel includes the temperature decrease during the adiabatic expansion with
  index γ = 1.5 at the initial temperature ~20 keV and linear velocity ~19
 0 km/s. Here we simulated the isotope yields for Mike\, Anacostia\, Barbel
 \, Par\, Vulcan and Kankakee experiments. The obtained results indicated o
 n the approximately linear dependence for relations of the isotope yields 
 relative to the obtained  neutron fluence [8]. In the work we considered t
 he pairs of neighboring isotopes with atomic masses A=245 and 244\, A=246 
 and 245\, A=247 and 246. The relation 246/245 (i.e.\, yields with masses A
 =246 and 245) depending on the fluences is the most strong demonstrator of
  the linear dependence. The most strong confirmation of the roughly linear
  dependence was obtained for the pure 238U target.\n\nReferences\n\n[1] Do
 rn DW. Phys Rev 1962\;126:693\n\n[2] United States Nuclear Tests. July 194
 5 through September 1992. DOE/NV-209-REV 16. September 2015.\n\n[3] Hoff R
 W\, Dorn DW. Nucl Sci Eng 1964\;18:110.\n\n[4] Dorn DW\, Hoff RW. Phys Rev
  Lett 1965\;14:440. \n\n[5] Balagna JP\, et al. Los Alamos Radiohemistry G
 roup. Phys Rev Lett 1965\;14:962.\n\n[6] Lutostansky YuS\, Lyashuk VI\, Pa
 nov IV. Bull Russ Acad Sci: Phys 2010\;75:533.\n \n[7] Lyashuk VI. Bull Ru
 ss Acad Sci: Phys 2012\;76:1182–6. \n\n[8] Lyashuk V.I.\, Results in Phy
 sics 2024\; 56:107234.\n\nhttps://indico.particle.mephi.ru/event/436/contr
 ibutions/4180/
LOCATION: Moskvorechye 2
URL:https://indico.particle.mephi.ru/event/436/contributions/4180/
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