Isospin effects on intermediate mass fragments at intermediate energy-heavy ion collisions

被引：18

作者：

Li, Li ^{[1
]}

Wang, Fang-Yuan ^{[1
]}

Zhang, Ying-Xun ^{[1
,2
]}

机构：

[1] China Inst Atom Energy, POB 275 18, Beijing 102413, Peoples R China

[2] Guangxi Normal Univ, Dept Phys & Technol, Guilin 540101, Peoples R China

来源：

NUCLEAR SCIENCE AND TECHNIQUES | 2022年 / 33卷 / 05期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

Symmetry energy; Intermediate mass fragments; Isospin effects; SYMMETRY ENERGY; EMISSION; CONSTRAINTS; PHYSICS; STATE;

D O I：

10.1007/s41365-022-01050-w

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

In this study, we investigated the isospin properties of intermediate mass fragments (IMFs) for the central Sn-112,Sn-124+Sn-112,Sn-124 collisions of Sn at a beam energy of 50 MeV per nucleon using an improved quantum molecular dynamics model (ImQMD) coupled with a sequential decay model (GEMINI). Three observables were analyzed: (1) the average center-of-mass kinetic energy per nucleon < E-c.m./A > of fragments as a function of their charge number Z; (2) the average neutron number to proton number ratio (< N >/Z) of fragments with a given charge number Z as a function of their center-of-mass kinetic energy per nucleon (E-c.m./A); and (3) the average total neutron number to total proton number ratio (Sigma N/Sigma Z) and double ratio (DR(N/Z)) of IMFs with Z = 3-8 as a function of their center-of-mass kinetic energy per nucleon E-c.m./A. Our calculations revealed that the sensitivity of the isospin properties of IMFs relative to the stiffness of the symmetry energy remains even after sequential decay. By comparing the calculations of Sigma N/Sigma Z and DR(N/Z) with the data, it was found that the soft symmetry energy, i.e., gamma = 0.5, is favored.

引用

页数：10

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