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Collision centrality and system size dependences of light nuclei production via dynamical coalescence mechanism

  • Regular Article - Theoretical Physics
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Abstract

Light (anti-)nuclei in relativistic heavy-ion collisions are considered to be formed by the coalescence mechanism of (anti-)nucleons in the present work. Using a dynamical phase-space coalescence model coupled with a multi-phase transport (AMPT) model, we explore the formation of light clusters such as deuteron, triton and their anti-particles in different centralities for \(^{197}\)Au + \(^{197}\)Au collisions at \(\sqrt{s_{NN}} = 39\) GeV. The calculated transverse momentum spectra of protons, deuterons, and tritons are comparable to those of experimental data from the RHIC-STAR collaboration. Both coalescence parameters \(B_{2}\) for (anti-)deuteron and \(B_{3}\) for triton increase with the transverse momentum as well as the collision centrality, and they are comparable with the measured values in experiments. The effect of system size on the production of light nuclei is also investigated by \(^{10}\)B + \(^{10}\)B, \(^{16}\)O + \(^{16}\)O, \(^{40}\)Ca + \(^{40}\)Ca, and \(^{197}\)Au + \(^{197}\)Au systems in central collisions. The results show that yields of light nuclei increase with system size, while the values of coalescence parameters present an opposite trend. It is interesting to see that the system size, as well as the centrality dependence of \(B_A\) (A = 2, 3), falls into the same group, which further demonstrates production probability of light nuclei is proportional to the size of the fireball. Furthermore, we compare our coalescence results with other models, such as the thermal model and analytic coalescence model, it seems that the description of light nuclei production is consistent with each other.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: This is a theoretical study and no experimental data has been listed.]

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Acknowledgements

This work was supported in part by the National Natural Science Foundation of China under contract Nos. 11875066, 11890710, 11890714, 11925502, 11961141003, National Key R&D Program of China under Grant No. 2018YFE0104600 and 2016YFE0100900, the Strategic Priority Research Program of CAS under Grant No. XDB34000000, the Key Research Program of Frontier Sciences of the CAS under Grant No. QYZDJ-SSW- SLH002, and the Guangdong Major Project of Basic and Applied Basic Research No. 2020B0301030008.

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Authors and Affiliations

  1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China

    Yi-Lin Cheng

  2. Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Fudan University, Shanghai, 200433, China

    Yi-Lin Cheng, Song Zhang & Yu-Gang Ma

  3. School of Nuclear Sciences and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China

    Yi-Lin Cheng

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Correspondence to Yu-Gang Ma.

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Communicated by Che-Ming Ko

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Cheng, YL., Zhang, S. & Ma, YG. Collision centrality and system size dependences of light nuclei production via dynamical coalescence mechanism. Eur. Phys. J. A 57, 330 (2021). https://doi.org/10.1140/epja/s10050-021-00639-w

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