Probing the medium effect and isospin dependence of the in-medium nucleon--nucleon cross section in heavy ion collisions
Liu Jian-Ye(刘建业)a)b)d)†, Guo Wen-Jun(郭文军)c), and Xing Yong-Zhong(邢永忠)a)b)d)
a Institute for the Theory of Basic Physics, Tianshui Normal University, Tianshui 741000, China;b Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;c Science College, University of Shanghai for Science and Technology, Shanghai 200093, China;d Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China
Abstract Probing in-medium nucleon--nucleon (NN) cross section $\sigma^{1}_{\rm NN}(\alpha)$ in heavy ion collisions has been investigated by means of the isospin-dependent quantum molecular dynamics (IQMD) with the isospin- and momentum-dependent interaction (IMDI$(\tau)$). It is found that there are the very obvious medium effect and the sensitive isospin-dependence of nuclear stopping $R$ on the in-medium NN cross section $\sigma^{1}_{\rm NN}(\alpha)$ in the nuclear reactions induced by halo-neutron projectile and the same-mass stable projectile. However, $R$ induced by the neutron-halo projectile is obviously lower than that induced by the corresponding stable projectile. In particular, there is a very obvious dependence of $R$ on the medium effect of $\sigma^{1}_{\rm NN}(\alpha)$ in the whole beam energy region for the above two kinds of projectiles. Therefore, the comparison between the results of $R$'s in the reactions induced by the neutron-halo projectile and the corresponding same-mass stable projectile is a more favourable probe for extracting the information of $\sigma^{1}_{\rm NN}(\alpha)$ because of adding a new judgement.
Fund: Project supported by the State Key
Development Program for Basic Research of China (Grant No
G2000077400), the Major Program of the National Natural Science
Foundation of China (Grant Nos 10435080 and 105350101), the National
Natural Science Foundation of
Cite this article:
Liu Jian-Ye(刘建业), Guo Wen-Jun(郭文军), and Xing Yong-Zhong(邢永忠) Probing the medium effect and isospin dependence of the in-medium nucleon--nucleon cross section in heavy ion collisions 2007 Chinese Physics 16 3305
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