# Different production sources of light nuclei inultra-relativistic heavy-ion collisions Supported by National Natural Science Foundation of China (11505104, 11575100, 11675091)

Wang, Rui-Qin ( School of Physics and Physical Engineering, Qufu Normal University, Shandong 273165, China) ; Song, Jun ( Department of Physics, Jining University, Shandong 273155, China) ; Li, Gang ( School of Physics and Physical Engineering, Qufu Normal University, Shandong 273165, China) ; Shao, Feng-Lan ( School of Physics and Physical Engineering, Qufu Normal University, Shandong 273165, China)

06 March 2019

Abstract: We systematically study different production sources of light nuclei in ultra-relativistic heavy-ion collisions with a new method, an exclusive quark combination model + an inclusive hadron recombination model. We take deuterons and 3He produced in Pb-Pb collisions at TeV as examples to show the contribution of different production sources by studying their rapidity densities , yield ratios and transverse momentum ( ) spectra just after hadronization and at the final kinetic freeze-out. We find that about a half of and a fourth of 3He created just after hadronization can survive after the hadronic evolution process. Nucleons from resonance decays make a much larger contribution to the regeneration of light nuclei at the hadronic phase stage, and this contribution is about 77% and 90% for and 3He, respectively, calculated at the final kinetic freeze-out. In addition, we give an explanation for the constant behaviors of yield ratios and 3He as a function of the averaged charged multiplicity in Pb-Pb collisions and also provide a possible explanation for the observation that in Pb-Pb collisions is larger by a factor of about two than in pp collisions at LHC energies.

Published in: Chinese Phys. C 43 (2019) 024101