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SUMMARY:Production of light nuclei in collisions of $^{124\,136}$Xe with C
 sI target
DTSTART;VALUE=DATE-TIME:20261028T135000Z
DTEND;VALUE=DATE-TIME:20261028T140500Z
DTSTAMP;VALUE=DATE-TIME:20261030T090807Z
UID:indico-contribution-6301@cern.ch
DESCRIPTION:Speakers: Aleksandr Svetlichnyi (INR RAS\, MIPT(NRU))\n    T
 he difference between the numbers of neutrons and protons in atomic nuclei
  defines the isospin asymmetry of nuclei. The squared relative difference 
 between the local densities of neutrons and protons contributes to the den
 sity-dependent symmetry energy term in the equation of state of nuclear ma
 tter. In particular\, this contribution makes the nuclei with a large neut
 ron excess unstable and defines the parameters of neutron stars [1]. Compa
 rative studies of nuclear reactions induced by projectiles with similar ma
 ss numbers but differing neutron and proton numbers on the same target all
 ow for systematic investigations of isospin asymmetry effects [2]. As foun
 d in Ref. [2]\, the cross sections for the production of heavy isotopes ar
 e particularly sensitive to the isospin content of projectile nuclei.\n\n
     In this work\, the Abrasion-Ablation Monte Carlo for Colliders model
  with pre-equilibrium clustering based on the Minimum Spanning Tree algori
 thm (AAMCC-MST) [3\,4] was used to study the production of light spectator
  fragments. In AAMCC-MST\, the Glauber Monte Carlo model [5] is used to ca
 lculate the numbers of participant and spectator nucleons. The latter are 
 assumed to form spectator prefragments. In particular\, in peripheral coll
 isions such prefragments consist of multiple excited nuclear clusters defi
 ned by the MST clustering algorithm [3]. Depending on their excitation en
 ergy\, the clusters undergo various secondary decays simulated with de-exc
 itation models from the Geant4 library [6].\n\n    Fragmentation of rel
 ativistic nuclei can be investigated using forward detectors in the Baryon
 ic Matter at Nuclotron (BM@N) experiment [7] at the NICA accelerator compl
 ex. Specifically\, light spectator fragments with charges Z = 1–5 from t
 he fragmentation of 3.8A GeV $^{124}$Xe on a CsI target can be measured by
  the scintillation wall [8]. The potential use of a $^{136}$Xe beam is cur
 rently under discussion. Here\, we present a comparative study of light sp
 ectator fragment emission in collisions of $^{124}$Xe and $^{136}$Xe with 
 $^{130}$Xe representing the CsI target. Production cross sections for frag
 ments with Z = 1–5 were calculated as a function of collision centrality
 . In addition\, the relative yields of spectator protons\, $^{2\,3}$H\, an
 d $^{3\,4}$He in the 10 % of most central collisions were calculated to p
 robe the isospin content of the fragmenting systems.\n\n\n#References\n1. 
 Steiner A. W.\, Prakash M.\, Lattimer J. M.\, Ellis P. J. Isospin asymmetr
 y in nuclei and neutron stars // Phys. Rep. 2005. Vol. 411. P. 325.\n2. D.
  Henzlova\, K.-H. Shmidt\, M.V. Richardi et al\,  Experimental investig
 ation of the residues produced in the 136Xe + Pb and 124Xe + Pb fragmentat
 ion reactions at 1A GeV // Phys. Rev. C 2008. Vol. 78. P. 044616.\n3. Nepe
 ivoda R.\, Svetlichnyi A.\, Kozyrev N.\, et al. Pre-Equilibrium Clustering
  in Production of Spectator Fragments in Collisions of Relativistic Nuclei
  // Particles. 2022. Vol. 5. P. 40.\n4. Kozyrev N.\, Svetlichnyi A.\, Nepe
 ivoda R.\, et al. Peeling away neutron skin in ultracentral collisions of 
 relativistic nuclei // Eur. Phys. J. A. 2022. Vol. 58. P. 184.\n5. Loizide
 s C.\, Kamin J.\, d’Enterria D. Improved Monte Carlo Glauber predictions
  at present and future nuclear colliders // Phys. Rev. C. 2018. Vol. 97. P
 . 054910.\n6. Allison J.\, Amako K.\, Apostolakis J.\, et al. Recent devel
 opments in Geant4 // Nucl. Instrum. Meth. A. 2016. Vol. 835. P. 186.\n7. K
 apishin M.\, et al. Studies of baryonic matter at the BM@N experiment (JIN
 R) // Nucl. Phys. A. 2019. Vol. 982. P. 967.\n8. Volkov V.\, Golubeva M.\,
  Guber F.\, et al. Performance of the scintillation wall in the BM@N exper
 iment // Nucl. Instrum. Meth. A. 2025. Vol. 1077. P. 170529.\n\nhttps://in
 dico.particle.mephi.ru/event/626/contributions/6301/
LOCATION: Conference Hall 5
URL:https://indico.particle.mephi.ru/event/626/contributions/6301/
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