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Title: Empirical limitations of energy dissipation in /sup 252/Cf(sf)

Abstract

Limitations for the energy dissipated in the spontaneous fission of /sup 252/Cf have been studied on the basis of the experimental fragment kinetic energies, neutron, and ..gamma.. data and the calculated (static) potential energies of the fragments. Upper bounds for the dissipated energy are obtained by restricting the parameter space of the fissioning system to the domain which is compatible with the experimental post-scission data, and by computing the maximum energy available in this domain for dissipation. No assumptions have been made about the fission dynamics or the dissipation mechanism. A numerical evaluation has been performed fro 19 pairs of fragments in /sup 252/Cf(sf), taking into account spheroidal fragment shapes with diffuse surface, nuclear interaction and Coulomb excitation effects. The energy available for internal excitation at scission is found to be small (exclamation 20 MeV). An analysis of the uncertainties entering into this result shows that high dissipation in /sup 252/Cf(sf) is incompatible with the existing experimental data unless peculiar fragment shapes are assumed. Upper bounds are also given for the fragment deformations. We discuss the hypothesis of minimum potential energy at scission, the influence of fragment shell effects, and the relevance of data from ternary fission.

Authors:
;
Publication Date:
Research Org.:
Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742
OSTI Identifier:
6946729
Resource Type:
Journal Article
Journal Name:
Phys. Rev., C; (United States)
Additional Journal Information:
Journal Volume: 18:3
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CALIFORNIUM 252; SPONTANEOUS FISSION; FISSION FRAGMENTS; ENERGY LOSSES; COULOMB EXCITATION; ENERGY SPECTRA; GAMMA SPECTRA; KINETIC ENERGY; NEUTRON SPECTRA; NUCLEAR DEFORMATION; SHELL MODELS; ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; CALIFORNIUM ISOTOPES; DEFORMATION; ENERGY; ENERGY-LEVEL TRANSITIONS; EVEN-EVEN NUCLEI; EXCITATION; FISSION; HEAVY NUCLEI; ISOTOPES; MATHEMATICAL MODELS; NUCLEAR FRAGMENTS; NUCLEAR MODELS; NUCLEAR REACTIONS; NUCLEI; RADIOISOTOPES; SPECTRA; YEARS LIVING RADIOISOTOPES; 652016* - Nuclear Properties & Reactions, A=220 & above, Theoretical- Spontaneous & Induced Fission- (-1987)

Citation Formats

Schultheis, H, and Schultheis, R. Empirical limitations of energy dissipation in /sup 252/Cf(sf). United States: N. p., 1978. Web. doi:10.1103/PhysRevC.18.1317.
Schultheis, H, & Schultheis, R. Empirical limitations of energy dissipation in /sup 252/Cf(sf). United States. https://doi.org/10.1103/PhysRevC.18.1317
Schultheis, H, and Schultheis, R. 1978. "Empirical limitations of energy dissipation in /sup 252/Cf(sf)". United States. https://doi.org/10.1103/PhysRevC.18.1317.
@article{osti_6946729,
title = {Empirical limitations of energy dissipation in /sup 252/Cf(sf)},
author = {Schultheis, H and Schultheis, R},
abstractNote = {Limitations for the energy dissipated in the spontaneous fission of /sup 252/Cf have been studied on the basis of the experimental fragment kinetic energies, neutron, and ..gamma.. data and the calculated (static) potential energies of the fragments. Upper bounds for the dissipated energy are obtained by restricting the parameter space of the fissioning system to the domain which is compatible with the experimental post-scission data, and by computing the maximum energy available in this domain for dissipation. No assumptions have been made about the fission dynamics or the dissipation mechanism. A numerical evaluation has been performed fro 19 pairs of fragments in /sup 252/Cf(sf), taking into account spheroidal fragment shapes with diffuse surface, nuclear interaction and Coulomb excitation effects. The energy available for internal excitation at scission is found to be small (exclamation 20 MeV). An analysis of the uncertainties entering into this result shows that high dissipation in /sup 252/Cf(sf) is incompatible with the existing experimental data unless peculiar fragment shapes are assumed. Upper bounds are also given for the fragment deformations. We discuss the hypothesis of minimum potential energy at scission, the influence of fragment shell effects, and the relevance of data from ternary fission.},
doi = {10.1103/PhysRevC.18.1317},
url = {https://www.osti.gov/biblio/6946729}, journal = {Phys. Rev., C; (United States)},
number = ,
volume = 18:3,
place = {United States},
year = {Fri Sep 01 00:00:00 EDT 1978},
month = {Fri Sep 01 00:00:00 EDT 1978}
}