Surveying post-saddle nuclear dissipation with protons and α particles as probes  

作　　者：叶巍 

机构地区：[1]Department of Physics, Southeast University

出　　处：《Chinese Physics C》2010年第1期45-48,共4页中国物理C（英文版）

基　　金：Supported by National Nature Science Foundation of China (10405007);Scientific Research Foundation of the Ministry of Education of China for Returned Overseas Scholars

摘　　要：Using a Langevin model, we calculate post-saddle proton and α-particle multiplicities as a function of the post-saddle dissipation strength （β） for the heavy systems 234Cf, 240Cf, 246Cf and 240U. We find that, with increasing isospin of the system, the sensitivity of post-saddle light charged-particle multiplicities to β decreases considerably and, moreover, for 240U the charged-particle multiplicities are no longer sensitive to β. These results suggest that in order to determine the post-saddle friction strength more accurately by measuring the multiplicities of pre-scission protons and α particles, it is best to populate those heavy compound systems with low isospin.Using a Langevin model, we calculate post-saddle proton and α-particle multiplicities as a function of the post-saddle dissipation strength （β） for the heavy systems 234Cf, 240Cf, 246Cf and 240U. We find that, with increasing isospin of the system, the sensitivity of post-saddle light charged-particle multiplicities to β decreases considerably and, moreover, for 240U the charged-particle multiplicities are no longer sensitive to β. These results suggest that in order to determine the post-saddle friction strength more accurately by measuring the multiplicities of pre-scission protons and α particles, it is best to populate those heavy compound systems with low isospin.

关 键 词：nuclear dissipation light charged-particle multiplicity isospin effect 

分 类 号：O571[理学—粒子物理与原子核物理]