BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Creation of transuraniums in experimental prompt r-process and inv
 erse task of the neutron fluence
DTSTART;VALUE=DATE-TIME:20261028T132000Z
DTEND;VALUE=DATE-TIME:20261028T133500Z
DTSTAMP;VALUE=DATE-TIME:20261103T142440Z
UID:indico-contribution-6346@cern.ch
DESCRIPTION:Speakers: Vladimir Lyashuk (The Institute for Nuclear Research
  of the Russian Academy of Sciences\, Moscow\, 117312 Russia )\nCreation o
 f transuranic nuclides in experimental pulsed neutron fluxes of high inten
 sity (up to 10E+30 – 10E+31 n/cm2) is investigated in the kinetic model 
 of the astrophysical r-process. The dynamics of the rapid nucleosynthesis 
 (in the interval ~10E-6 s) is introduced when the process temperature decr
 eases and is taken into account by correction of the cross sections at rad
 iation capture of neutrons. In spite of the more lower fluxes and temperat
 ure compare to possible cosmological sites of superheavy isotope productio
 n  (up tp 10E+40 n/cm2 and  ~10E+9 K in case of binary star mergers\, stri
 pping matter in massive binary systems) an application of heavy (actinides
 ) targets allows to ensure production of identifiable quantities of transu
 raniums up to 257Fm by multiple neutron capture (up to 19 neutrons for 238
 U targets). Subsequent correction of transuranium outputs after pulse term
 ination is taken into account in beta-decays of neutron-excess nuclei.\n\n
 The produced analytical analysis strongly indicated on the roughly linear 
 dependence of the relation of isotope yields on the pulse neutron fluence.
  Agreement of calculated isotope relations with experiments is a criterion
  of possible fluence. Evaluation of the realized neutron fluence  is the i
 nverse problem. The task of yields modeling of neutron-rich isotopes (and 
 inverse problem of the achieved fluence) during multiple neutron captures 
 is solved in the developed ABM model\, which takes into account the drop o
 f the temperature during the expansion of matter with a linear velocity ~1
 90 km/s. The model allowed to obtain good or satisfactory agreement with p
 ublished US-experiment for pulse production of transuranic elements. In th
 e simulation it was applied the 238U\, 238Pa and 243Am targets according t
 o declared results of the tests. It was proposed an algorithm for calculat
 ing dependence of isotope relations on fluence for complex targets. It was
  evaluated achieved fluences and obtained good agreement in isotope relati
 on of seven large scale experiments.\n\n[1] G. I. Bell. Phys. Rev. 139\, B
 1207 (1965)..\n\n[2] J. S. Ingley\, Nucl. Phys. A 124\, (1969) 130 (1969).
 \n\n[3] V. I. Zagrebaev\, A. V. Karpov\, I. N. Mishustin\, and W. Greiner\
 , Phys. Rev. C 84\, (2011) 044617.\n\n[4] Yu. S. Lutostansky\, and V. I. L
 yashuk. Phys. At. Nucl. 88\, 16 (2025)..\n\n[5] V. I. Lyashuk\, Results in
  Physics. Volume 56\, (2024) 107234.\n\n[6] V. I. Lyashuk\, Physics of Par
 ticles and Nuclei Letters\, 2025\, Vol. 22\, No. 2\, (2025)  324.\n\nhttps
 ://indico.particle.mephi.ru/event/626/contributions/6346/
LOCATION: Conference Hall 1
URL:https://indico.particle.mephi.ru/event/626/contributions/6346/
END:VEVENT
END:VCALENDAR