A Detailed Study of Pre-scission γ Emission as a Probe of Nuclear Dissipation |
| |
作者姓名: | WU Feng YE Wei CHEN Na |
| |
作者单位: | [1]Department of Physics Southeast University, Nanjing 210096, China [2]Department of Mathematics, Nanjing University of Finance & Economics, Nanjing 210003, China |
| |
基金项目: | The project supported by National Natural Science Foundation of China under Grant No. 10405007 |
| |
摘 要: | Using a Langevin equation coupled with a statistical model, we calculate pre-scission giant dipole resonance (GDR) γ-ray multiplicity of nuclei 194 pb, 200Pb, 206Pb, and 200 Os. It is demonstrated that with increasing the isospin asymmetry of these fissioning nuclei the sensitivity of the emitted γ multiplicity to the nuclear viscosity coefficient is decreased significantly. For 200Os nuc/eus, this γ-ray emission is no longer sensitive to the magnitude of the viscosity coefficient. In addition, the effect of the isospin asymmetry on the γ rays as a probe of nuclear dissipation is reduced with increasing angular momentum. These results suggest that to obtain a more accurate information of the viscosity coemfficient by the measurement of pre-scission GDR γ-ray multiplicity it is better to choose those compound systems with small isospin asymmetry and low spin.
|
关 键 词: | 原子核物理学 偶极子 共振子 γ射线 同位旋不对称效应 |
收稿时间: | 2006-10-16 |
修稿时间: | 2007-01-19 |
本文献已被 维普 等数据库收录! |
| 点击此处可从《理论物理通讯》浏览原始摘要信息 |
| 点击此处可从《理论物理通讯》下载免费的PDF全文 |
|