Five-Dimensional Fission Potential-Energy Surfaces
and Barrier Heights
from A=70 to A=252
Peter Möller, David G. Madland, and Arnold J. Sierk
Theoretical Division, Los Alamos National Laboratory, New Mexico 87545, USA
Akira Iwamoto
Advanced Science Research Center,
Japan Atomic Energy Research Institute,
Tokai, Naka-gun, Ibaraki, 319-11 Japan
This paper was presented at the
Tours 2000, Tours Symposium on Nuclear Physics IV,
Tours, France, September 4-7, 2000.
It has been assigned
Los Alamos National Laboratory Preprint No LA-UR-00-4038,
and was published in
AIP Confernce Proceedings, 561
(2001) 455-468
Abstract:
We calculate complete fission potential-energy surfaces versus five
shape coordinates: elongation, neck diameter, light-fragment
deformation, heavy-fragment deformation, and mass asymmetry
for even nuclei in the range 81 < Z < 101. The potential
energy is calculated in terms of the macroscopic-microscopic
model with a folded-Yukawa single-particle potential and
a Yukawa-plus-exponential macroscopic model in the
three-quadratic-surface parameterization.
The structure of the calculated energy landscapes
exhibits multiple valleys leading to different scission configurations.
The properties of these valleys and the saddle-points
at the beginning of these
valleys can be directly related to bimodal fission properties observed
in the radium region, in the light-actinide region, and in the fermium region.
The rms deviation between
calculated and experimental fission-barrier heights is only 1.08 MeV for 31
nuclei from 70-Se to 252-Cf.
Figures 2, 3, 4, 5, 6 and 8 are in color, so the paper should be printed
on a color printer. Figures 4, 5, and 6 are quite large, up to 23 Mb,
and they occur on pages 8, 9, and 10 respectively. On some printers
these pages may take a considerable time to print.
The unzipped file is about 45 Mb.
The complete manuscript
is
available for download.
Page by
Peter Möller
moller@lanl.gov
created 2001 last modified 5 July 2012