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Title: Fission-fragment mass distributions from strongly damped shape evolution

Abstract

Random walks on five-dimensional potential-energy surfaces were recently found to yield fission-fragment mass distributions that are in remarkable agreement with experimental data. Within the framework of the Smoluchowski equation of motion, which is appropriate for highly dissipative evolutions, we discuss the physical justification for that treatment and investigate the sensitivity of the resulting mass yields to a variety of model ingredients, including in particular the dimensionality and discretization of the shape space and the structure of the dissipation tensor. The mass yields are found to be relatively robust, suggesting that the simple random walk presents a useful calculational tool. Quantitatively refined results can be obtained by including physically plausible forms of the dissipation, which amounts to simulating the Brownian shape motion in an anisotropic medium.

Authors:
 [1]; ;  [2]
  1. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  2. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
21596764
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 84; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.84.034613; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ANISOTROPY; EQUATIONS OF MOTION; FISSION FRAGMENTS; FISSION YIELD; MASS; MASS DISTRIBUTION; POTENTIAL ENERGY; RANDOMNESS; SENSITIVITY; SIMULATION; SURFACES; DIFFERENTIAL EQUATIONS; DISTRIBUTION; ENERGY; EQUATIONS; NUCLEAR FRAGMENTS; NUCLEAR REACTION YIELD; PARTIAL DIFFERENTIAL EQUATIONS; SPATIAL DISTRIBUTION; YIELDS

Citation Formats

Randrup, J., Moeller, P., and Sierk, A. J. Fission-fragment mass distributions from strongly damped shape evolution. United States: N. p., 2011. Web. doi:10.1103/PHYSREVC.84.034613.
Randrup, J., Moeller, P., & Sierk, A. J. Fission-fragment mass distributions from strongly damped shape evolution. United States. doi:10.1103/PHYSREVC.84.034613.
Randrup, J., Moeller, P., and Sierk, A. J. Thu . "Fission-fragment mass distributions from strongly damped shape evolution". United States. doi:10.1103/PHYSREVC.84.034613.
@article{osti_21596764,
title = {Fission-fragment mass distributions from strongly damped shape evolution},
author = {Randrup, J. and Moeller, P. and Sierk, A. J.},
abstractNote = {Random walks on five-dimensional potential-energy surfaces were recently found to yield fission-fragment mass distributions that are in remarkable agreement with experimental data. Within the framework of the Smoluchowski equation of motion, which is appropriate for highly dissipative evolutions, we discuss the physical justification for that treatment and investigate the sensitivity of the resulting mass yields to a variety of model ingredients, including in particular the dimensionality and discretization of the shape space and the structure of the dissipation tensor. The mass yields are found to be relatively robust, suggesting that the simple random walk presents a useful calculational tool. Quantitatively refined results can be obtained by including physically plausible forms of the dissipation, which amounts to simulating the Brownian shape motion in an anisotropic medium.},
doi = {10.1103/PHYSREVC.84.034613},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 3,
volume = 84,
place = {United States},
year = {2011},
month = {9}
}