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

Li Li; Fang-Yuan Wang; Ying-Xun Zhang

doi:10.1007/s41365-022-01050-w

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

NUCLEAR PHYSICS AND INTERDISCIPLINARY RESEARCH | Updated：2022-07-27

- Isospin effects on intermediate mass fragments at intermediate energy-heavy ion collisions
- Nuclear Science and Techniques Vol. 33, Issue 5, Article number: 58(2022)
- Affiliations：
  
  1.China Institute of Atomic Energy, P. O. Box 275(18), Beijing 102413, China
  2.Department of Physics and Technology, Guangxi normal University, Guilin 540101, China
- Author bio：
  
  zhyx@ciae.ac.cn
- Funds：
- DOI：10.1007/s41365-022-01050-w
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Li Li, Fang-Yuan Wang, Ying-Xun Zhang. Isospin effects on intermediate mass fragments at intermediate energy-heavy ion collisions. [J]. Nuclear Science and Techniques 33(5):58(2022)
DOI：

Li Li, Fang-Yuan Wang, Ying-Xun Zhang. Isospin effects on intermediate mass fragments at intermediate energy-heavy ion collisions. [J]. Nuclear Science and Techniques 33(5):58(2022) DOI： 10.1007/s41365-022-01050-w.

摘要

Abstract

In this study, we investigated the isospin properties of intermediate mass fragments (IMFs) for the central collisions of ,112,124,Sn+,112,124,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 (, $\sum N / \sum Z$ ,) 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 , $\sum N / \sum Z$ , and ,DR,(,N/Z,) with the data, it was found that the soft symmetry energy, i.e.,γ,=0.5, is favored.

关键词

Keywords

Symmetry energyIntermediate mass fragmentsIsospin effects

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Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou

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