Variation of transport coefficients for average fission dynamics with temperature and shape

Abstract

We study slow collective motion at finite thermal excitations on the basis of linear response theory applied to the locally harmonic approximation. The transport coefficients for average motion, friction γ, inertia M and the local stiffness C are computed along a fission path of Th-224 within a quasi-static picture. The inverse relaxation time β=γ/M and the effective damping rate η=γ/(2\sqrt{M|C|}) are found to increase with temperature, but do not change much with the collective variable. The values found for ηand βas well as their behavior with temperature are in accord with experimental findings.

23 pages, including figures, Latex plus 11 postscript files for figures; home page: http://www.physik.tu-muenchen.de/tumphy/e/T36/hofmann.html

References in corpus (3)

• Evaporation of light particles from a hot, deformed and rotating nucleus
• On the nature of nuclear dissipation, as a hallmark for collective dynamics at finite excitation
• Fission Decay Rates Determined from a Quantal Transport Equation

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• On nuclear transport at small excitations
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• The Effect of Nuclear Rotation on the Collective Transport Coefficients