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Consistent application of the finite-range liquid-drop model to Langevin fission dynamics of hot rotating nuclei

A V Karpov, P N Nadtochy, E G Ryabov and G D Adeev

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A generalized finite-range liquid-drop model based on the Yukawa-plus-exponential potential was applied to describe fission dynamics of hot rotating nuclei. The potential energy, level-density parameter and Helmholtz free energy are calculated in a consistent way by using the generalized finite-range liquid-drop model. The level-density parameter was approximated by a leptodermous-type expression. The coefficients of this expansion are in surprisingly good agreement with those obtained earlier by Ignatyuk and co-workers. The results of Langevin dynamical calculations of the mean prescission neutron multiplicity and fission probability are practically the same both for the level-density parameter calculated with Ignatyuk's coefficients and the one calculated using the generalized finite-range liquid-drop model. This fact lets us assume that all previous results of dynamical Langevin calculations performed with Ignatyuk's level-density parameter stay reliable.


PACS

21.60.Ev Collective models

24.75.+i General properties of fission

21.10.Ma Level density

25.85.-w Fission reactions

21.10.Re Collective levels

Subjects

Nuclear physics

Dates

Issue 10 (October 2003)

Received 30 April 2003, in final form 11 July 2003

Published 18 September 2003



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