Acceptance effect on the N_(t)N_(p)/N_(d)^(2)ratio of light nuclei coalescence yields as a probe of nucleon density fluctuations  

作　　者：An Gu Michael X.Zhang 

机构地区：[1]Huzhou University,Huzhou 313000,China [2]Purdue University,West Lafayette,IN 47907,USA [3]Livermore High School,Livermore,CA 94550,USA

出　　处：《Nuclear Science and Techniques》2025年第3期157-166,共10页核技术(英文)

基　　金：supported in part by the U.S.Department of Energy(No.DE-SC0012910);National Nature Science Foundation of China(Nos.12035006 and 12075085);the Ministry of Science and Technology of China(No.2020YFE020200)。

摘　　要：A coalescence model was employed to form deuterons(d),tritons(t),and helium-3(^(3)He)nuclei from a uniformly-distributed volume of protons(p)and neutrons(n).We studied the ratio N_(t)N_(p)/N_(d)^(2)of light nuclei yields as a function of the neutron density fluctuations.We investigated the effect of finite transverse momentum(p_(T))acceptance on the ratio,in particular,the“extrapolation factor”(f)for the ratio as a function of the p_(T)spectral shape and the magnitude of neutron density fluctuations.The nature of f was found to be monotonic in p_(T)spectra“temperature”parameter and neutron density fluctuation magnitude;variations in the latter are relatively small.We also examined f in realistic simulations using the kinematic distributions of protons measured from the heavy-ion collision data.The nature of f was found to be smooth and monotonic as a function of the beam energy.Therefore,we conclude that extrapolation from limited p_(T)ranges does not create,enhance,or reduce the local peak of the N_(t)N_(p)/N_(d)^(2)ratio in the beam energy.Our study provides a necessary benchmark for light nuclei ratios as a probe for nucleon density fluctuations,an important observation in the search for the critical point of nuclear matter.

关 键 词：Heavy-ion collision Critical point Light nuclei coalescence Nucleon density fluctuations 

分 类 号：O57[理学—粒子物理与原子核物理]