Isoscaling Parameter α as a Possible Probe of Medium Effect of Nucleon-Nucleon Cross Section  

作　　者：刘建业 郝焕锋 邢永忠 左维 李希国 

机构地区：[1]Institute of Basic Physics, College of Mathematics-Physics and Information, Tianshui Normal University, Tianshui 741000 [2]lnstitute of Modern Physics, Chinese Academy of Sciences, PO Box 31, Lanzhou 730000 [3]Center of Theoretical Nuclear Physics, National Laboratory of Heavy/on Accelerator, Lanzhou 730000

出　　处：《Chinese Physics Letters》2007年第7期1873-1875,共3页中国物理快报（英文版）

基　　金：Supported by the State Key Development Program for Basic Research of China under Grant No G2000077400, the Major Project of the National Natural Science Foundation of China under Grant Nos 10435080, the National Natural Science Foundation of China under Grant Nos 10447006 and 10575075, the Knowledge Innovation Project of Chinese Academy of Sciences under Grant No KJCX2-SW-N02.

摘　　要：The medium effect of nucleon-nucleon cross section reed σ^medNN （αm） on the isoscaling parameter α is investigated for two central nuclear reactions ^40 Ca＋ ^40Ca, ^60Ca＋^60Ca within isospin-dependent quantum molecular dynamics at beam energies from 40 to 50 MeV/nucleon. It is found that there is the very obvious medium effects of nucleonreed nucleon cross section σ^medNN （αm） on the isoscaling parameters a. In this case the isoscaling parameter a is a possible probe of the medium effect of nucleon-nucleon cross section σ^medNN （αm） in the heavy ion collisions. The mechanism of the above-mentioned properties is studied and discussed.The medium effect of nucleon-nucleon cross section reed σ^medNN （αm） on the isoscaling parameter α is investigated for two central nuclear reactions ^40 Ca＋ ^40Ca, ^60Ca＋^60Ca within isospin-dependent quantum molecular dynamics at beam energies from 40 to 50 MeV/nucleon. It is found that there is the very obvious medium effects of nucleonreed nucleon cross section σ^medNN （αm） on the isoscaling parameters a. In this case the isoscaling parameter a is a possible probe of the medium effect of nucleon-nucleon cross section σ^medNN （αm） in the heavy ion collisions. The mechanism of the above-mentioned properties is studied and discussed.

分 类 号：O57[理学—粒子物理与原子核物理]