利用MSDM分析p+^(208)Pb散裂反应产物  

Analyses for Spallation Fragment of p+^(208)Pb by Using MSDM

作　　者：樊胜[1] 阎芳[1] 张鸿洲[1] 赵志祥[1] 

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《原子核物理评论》2004年第4期391-393,共3页Nuclear Physics Review

基　　金：国家重点基础研究发展规划资助项目(G1999022600);国家自然科学基金资助项目(10305021)~~

摘　　要：多步动力学模型(MSDM)研究中、高能质子引起的散裂反应分为3个过程:核内级联、粒子预平衡发射以及通过蒸发粒子和裂变方式的剩余激发核退激发过程.利用Ignatyuk能级密度公式代替MSDM模型中的费米气体能级密度公式,改进其研究质子入射引起散裂产物的形成截面.采用Ignatyuk能级密度公式MSDM研究p+208Pb散裂产物的电荷、质量分布以及产物核形成截面,结果很好地再现了实验数据,且比利用费米气体能级密度的MSDM结果好得多.The level density of Ignatyuk formula is introduced into the Many stages dynamics model ( (MSDM)) instead of Fermi-gas formula to improve the simulation of spallation fragments. The results of (MSDM) with Ignatyuk formula reproduced the experimental data well for the mass and charge distributions, the formation cross sections of isotopic product of proton-induced spallation on^(208)Pb. The calculations are in agreement with the experimental data and better than some simulations by MSDM with Fermi-gas foumula of level density, also better than some calculations by QMD+SDM, QMD+FISSION, (LAHET) and YIELDX etc.

关 键 词：能级 费米气体 激发过程 高能质子 截面 质量分布 密度公式 变方 产物 反应 

分 类 号：O571[理学—粒子物理与原子核物理] O414.1[理学—物理]