A critical analysis of the modelling of dissipation in fission

被引：57

作者：

Jurado, B

Schmitt, C

Schmidt, KH

Benlliure, J

Junghans, AR

机构：

[1] GSI Darmstadt, D-64291 Darmstadt, Germany

[2] Univ Santiago de Compostela, Santiago De Compostela 15706, Spain

[3] Forschungszentrum Rossendorf EV, D-01314 Dresden, Germany

来源：

NUCLEAR PHYSICS A | 2005年 / 747卷 / 01期

关键词：

nuclear fission; dissipation effects; time-dependent fission-decay width; Langevin equation; Fokker-Planck equation; analytical approximation;

D O I：

10.1016/j.nuclphysa.2004.09.123

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The time-dependent flux over the fission barrier of an excited nucleus under the influence of dissipation is investigated. Characteristic features of the evolution of the amplitude of the probability distribution and the velocity profile at the fission barrier are derived. Analytical results are compared to numerical Langevin calculations and used to develop a new analytical approximation to the solution of the Fokker-Planck equation for the time-dependent fission-decay width. This approximation is shown to be more realistic than previously proposed descriptions, which were widely used in the past. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：14 / 43

页数：30

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