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Title: Microscopic description of fission properties

Abstract

Microscopic results on fission barriers, partial {gamma}-back and fission lifetimes of shape isomers are presented. They have been obtained from mean-field and beyond mean-field calculations using the effective D1S Gogny force.

Authors:
; ;  [1];  [2]
  1. CEA/DAM Ile de France, DPTA/Service de Physique Nucleaire, BP 12, 91680 Bruyeres-le-Chatel (France)
  2. Institut de Physique Nucleaire, CNRS-IN2P3 and Universite Paris XI, 15 rue Georges Clemenceau, 91406 Orsay (France)
Publication Date:
OSTI Identifier:
21056757
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 891; Journal Issue: 1; Conference: 6. Symposium on nuclear physics, Tours (France), 5-8 Sep 2006; Other Information: DOI: 10.1063/1.2713533; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ENERGY LEVELS; FISSION; FISSION BARRIER; ISOMERIC NUCLEI; LIFETIME; MEAN-FIELD THEORY; NUCLEAR FORCES; QUANTUM FIELD THEORY

Citation Formats

Goutte, H., Delaroche, J.-P., Girod, M., and Libert, J.. Microscopic description of fission properties. United States: N. p., 2007. Web. doi:10.1063/1.2713533.
Goutte, H., Delaroche, J.-P., Girod, M., & Libert, J.. Microscopic description of fission properties. United States. doi:10.1063/1.2713533.
Goutte, H., Delaroche, J.-P., Girod, M., and Libert, J.. Mon . "Microscopic description of fission properties". United States. doi:10.1063/1.2713533.
@article{osti_21056757,
title = {Microscopic description of fission properties},
author = {Goutte, H. and Delaroche, J.-P. and Girod, M. and Libert, J.},
abstractNote = {Microscopic results on fission barriers, partial {gamma}-back and fission lifetimes of shape isomers are presented. They have been obtained from mean-field and beyond mean-field calculations using the effective D1S Gogny force.},
doi = {10.1063/1.2713533},
journal = {AIP Conference Proceedings},
number = 1,
volume = 891,
place = {United States},
year = {Mon Feb 26 00:00:00 EST 2007},
month = {Mon Feb 26 00:00:00 EST 2007}
}
  • This year marks the 70th anniversary of the discovery of nuclear fission. While there is little question of the societal importance of fission (e.g., to current and future energy needs), our understanding of this process is still fairly rudimentary due to the intricacy of the problem. Theoretically, fission represents an extreme example of the large-amplitude collective motion: the tunneling of a large, self-bound, superfluid system of mutually interacting particles. In this work, we describe a study of spontaneous fission using the self-consistent nuclear density functional theory and state-of-the-art computational tools. We did not impose any symmetry on the mean fieldmore » so that the nuclear densities were allowed to acquire arbitrary shapes characterized by elongation, reflection-asymmetry, triaxiality, necking, etc. Here we show that the observed half-lives of nuclei undergoing bimodal fission can be explained in terms of competing pathways corresponding to different geometries of fission products. This is an important step in providing a many-body description of fundamental nuclear decay.« less
  • The statistical properties of matrix elements which couple the collective (or shape) degrees of nuclear motion with the intrinsic degrees of freedom, are evaluated in the adiabatic representation. The results will be used in a future paper for the calculation of transport coefficients which describe the irreversible (dissipative) transfer of energy from the collective degrees of freedom to the intrinsic ones. As input we use a random-matrix model for the residual interaction, and salient properties of single-particle levels in nonspherical potentials.
  • Our understanding of nuclear fission, a fundamental nuclear decay, is still incomplete due to the complexity of the process. In this paper, we describe a study of spontaneous fission using the symmetry-unrestricted nuclear density functional theory. Our results show that the observed bimodal fission can be explained in terms of pathways in multidimensional collective space corresponding to different geometries of fission products. We also predict a new phenomenon of trimodal spontaneous fission for some rutherfordium, seaborgium, and hassium isotopes.
  • We investigated the energy properties of {alpha}-cluster matter in a microscopic framework by arranging {alpha}-clusters in a cubic close-packed configuration in the generator coordinate space, and extracted the surface effects from the total binding energy. The stability of {alpha} clusters in matter is probed by allowing the {alpha} clusters to be distorted so as to approach uniformly dense nuclear matter. To compare the result for the binding energy per nucleon with that of ordinary nuclear matter, we solve the dynamical problem of an {alpha} cluster in a cavity embedded in {alpha}-cluster matter. {copyright} {ital 1996 The American Physical Society.}