Microscopic Three-Body Force Effect on Nucleon-Nucleon Cross Sections in Symmetric Nuclear Matter  

作　　者：ZHANG Hong-Fei ZUO Wei Lombardo Umberto LI Zeng-Hua LI Jun-Qing 

机构地区：[1]School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China [2]Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China [3]Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China [4]Dipartimento di Fisica, Universitk di Catania, and INFN-LNS, Via S. Sofia 64, 1-95123 Catania, Italy

出　　处：《Communications in Theoretical Physics》2008年第11期1219-1224,共6页理论物理通讯（英文版）

基　　金：supported by the Asia-Link project(CN/ASIA-LINK/008(94791))of the European Commission;in part by National Natural Science Foundation of China under Grant Nos.10775061,10505016,10575119,and 10175074;the Knowledge Innovative Project of CAS under Grant No.KJCX3-SYW-N2;the Major Prophase Research Project of Fundamental Research of the Ministry of Science and Technology of China under Grant No.2007CB815004

摘　　要：We provide a microscopic calculation of neutron-proton and proton-proton cross sections in symmetric nuclear matter at various densities, using the Brueckner Hartree-Fock approximation scheme with the Argonne Va4 potential including the contribution of microscopic three-body force. We investigate separately the effects of three-body force on the effective mass and on the scattering amplitude. In the present calculation, the rearrangement contribution of three-body force is considered, which will reduce the neutron and proton effective mass, and depress the amplitude of cross section. The effect of three body force is shown to be repulsive, especially in high densities and large momenta, which will suppress the cross section markedly.

关 键 词：nucleon-nucleon cross section nuclear matter three-body force 

分 类 号：O57[理学—粒子物理与原子核物理]