Effects of Symmetry Energy in the Reaction ^(40)Ca+^(124)Sn at 140 MeV/Nucleon  

作　　者：ZHANG Fang HU Bi-Tao YONG Gao-Chan ZUO Wei 张芳;胡碧涛;雍高产;左维(School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000)

机构地区：[1]School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000 [2]Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000

出　　处：《Chinese Physics Letters》2012年第5期81-84,共4页中国物理快报（英文版）

基　　金：Supported in part by the National Natural Science Foundation of China under Grant Nos 10947109,10875151,11175219 and 10740420550;the Knowledge Innovation Project of Chinese Academy of Sciences(KJCX2-EW-N01);the National Basic Research Program of China under Grant No 2007CB815004;the CAS/SAFEA International Partnership Program for Creative Research Teams(CXTD-J2005-1);the Fundamental Research Fund for Physics and Mathematic of Lanzhou University LZULL200908;the Fundamental Research Funds for the Central Universities(LZUJBKY-2010-160).

摘　　要：Density-dependent symmetry energy is a hot topic in nuclear physics.Many laboratories across the world are planning to perform related experiments to probe symmetry energy. Based on the semiclassical BoltzmannUehling-Uhlenbeck (BUU) transport model,we study the effects of nuclear symmetry energy in the central reaction ^(40)Ca+^(124)Sn at 140 MeV/nucleon in the laboratory system.It is found that the rapidity distribution of the free nucleon's neutron-to-proton ratio is sensitive to the symmetry energy,especially at large rapidities.Free neutron-to-proton ratios at small or large rapidities may reflect high or low density behavior of nuclear symmetry energy.To probe the density dependence of nuclear symmetry energy,it is better to give the kinetic distribution and the rapidity distribution of emitted nucleons at the same time.

关 键 词：energy SYMMETRY distribution 

分 类 号：O57[理学—粒子物理与原子核物理]