Coalescence, the thermal model and multi-fragmentation: the energy and volume dependence of light nuclei production in heavy ion collisions

Hillmann, Paula; Käfer, Katharina; Steinheimer, Jan; Vovchenko, Volodymyr; Bleicher, Marcus

doi:10.1088/1361-6471/ac5dfc

Title: Coalescence, the thermal model and multi-fragmentation: the energy and volume dependence of light nuclei production in heavy ion collisions

Journal Article · 31 March 2022 · Journal of Physics. G, Nuclear and Particle Physics

DOI: https://doi.org/10.1088/1361-6471/ac5dfc · OSTI ID:1880815

^[1]; Käfer, Katharina ^[2];

^[3]; Vovchenko, Volodymyr ^[4]; Bleicher, Marcus ^[1]

Goethe Univ. Frankfurt (Germany); Helmholtz Research Academy Hesse for FAIR (HFHF), Frankfurt am Main (Germany); GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany); John von Neumann-Institut für Computing, Julich (Germany)
Goethe Univ. Frankfurt (Germany)
Frankfurt Inst. for Advanced Studies (Germany)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Here, we present results of a phase space coalescence approach within the UrQMD transport and -hybrid model for a very wide range of beam energies from SIS to LHC. The coalescence model is able to qualitatively describe the whole range of experimental data with a fixed set of parameters. Some systematic deviations are observed for very low beam energies where the role of feed down from heavier nuclei and multi-fragmentation becomes relevant. The coalescence results are mostly very close to the thermal model fits. However, both the coalescence approach as well as thermal fits are struggling to simultaneously describe the triton multiplicities measured with the STAR and ALICE experiment. The double ratio of tp/d², in the coalescence approach, is found to be essentially energy and centrality independent for collisions of heavy nuclei at beam energies of E_lab > 10A GeV. On the other hand the clear scaling of the d/p² and t/p³ ratios with the systems volume is broken for peripheral collisions, where a canonical treatment and finite size effects become more important.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1880815

Journal Information:: Journal of Physics. G, Nuclear and Particle Physics, Journal Name: Journal of Physics. G, Nuclear and Particle Physics Journal Issue: 5 Vol. 49; ISSN 0954-3899

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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