https://doi.org/10.1140/epja/s10050-022-00897-2
Regular Article - Theoretical Physics
Neutron density fluctuation and neutron–proton correlation from AMPT model
1
School of Physics and Mechanical Electrical and Engineering, Hubei University of Education, 430205, Wuhan, China
2
Institute of Theoretical Physics, Hubei University of Education, 430205, Wuhan, China
3
School of Physics and Electronic Engineering, Xinyang Normal University, 464000, Xinyang, People’s Republic of China
4
Key Laboratory of Quark and Lapten Physics (MOE), Central China Normal University, 430079, Wuhan, China
Received:
7
September
2022
Accepted:
27
November
2022
Published online:
10
December
2022
Using the multiphase transport (AMPT) model, we study the relative neutron density fluctuation and neutron–proton correlation in matter produced by Au + Au collisions at 
7.7–200 GeV. The rapidity, centrality, and energy dependence of these two observations are also discussed. The light nuclei yield ratio of proton, deuteron, and triton 
calculated directly from the relative neutron density fluctuation and neutron–proton correlation, decreases with rapidity coverage and increases with collision centrality. Our study also found that the ratio does not exhibit any non-monotonic behavior in collision energy dependence. Since there is no first-order phase transition or critical physics in the AMPT model, our work provides a reference for extracting the relative neutron density fluctuation from light nuclei production in experiments.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
