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Isospin dependence of projectile-like fragment production at intermediate energies

Ma Chun-Wang (马春旺)^*, Wei Hui-Ling (魏慧玲), Wang Jun-Yang (王俊阳), and Liu Gao-Jie (刘高杰)

Fu Yao (傅瑶), Fang De-Qing (方德清), Tian Wen-Dong (田文栋), Cai Xiang-Zhou (蔡翔舟), Wang Hong-Wei (王宏伟), and Ma Yu-Gang (马余刚)

College of Physics and Information Engineering, Henan Normal University, Xinxiang 453007, People's Republic of China

Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P. O. Box 800-204, Shanghai 201800, People's Republic of China

^*machunwang@126.com

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Phys. Rev. C 79, 034606 – Published 18 March, 2009

DOI: https://doi.org/10.1103/PhysRevC.79.034606

Abstract

The cross sections of fragments produced in 140 $A$ MeV ${}^{40, 48}{Ca} + {}^{9}{Be}$ and ${}^{58, 64}{Ni} + {}^{9}{Be}$ reactions are calculated by the statistical abration-ablation (SAA) model and compared to the experimental results measured at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University. The fragment isotopic and isotonic cross section distributions of ${}^{40}{Ca}$ and ${}^{48}{Ca}$ , ${}^{58}{Ni}$ and ${}^{64}{Ni}$ , ${}^{40}{Ca}$ and ${}^{58}{Ni}$ , and ${}^{48}{Ca}$ and ${}^{64}{Ni}$ are compared and the isospin dependence of the projectile fragmentation is studied. It is found that the isospin dependence decreases and disappears in the central collisions. The shapes of the fragment isotopic and isotonic cross section distributions are found to be very similar for symmetric projectile nuclei. The shapes of the fragment isotopic and isotonic distributions of different asymmetric projectiles produced in peripheral reactions are found to be very similar. The similarity of the distributions are related to the similar proton and neutron density distributions inside the nucleus in framework of the SAA model.

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Isospin dependence of projectile-like fragment production at intermediate energies

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