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

Journal Article · Fri Sep 01 00:00:00 EDT 1978 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.18.1317· OSTI ID:6946729

Schultheis, H; Schultheis, R

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.

• Research Organization: Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742
• OSTI ID: 6946729
• Journal Information: Phys. Rev., C; (United States), Vol. 18:3
• Country of Publication: United States
• Language: English

Related Subjects

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)