Improved calculation of the prompt fission neutron spectrum from the spontaneous fission of /sup 252/Cf

Conference · Fri Jan 01 04:00:00 EST 1988

OSTI ID:7172411

Madland, D G

An improved calculation is presented for the prompt fission neutron spectrum N(E) from the spontaneous fission of /sup 252/Cf. In this calculation the fission-spectrum model of Madland and Nix is used, but with several improvements leading to a physically more accurate representation of the spectrum. Specifically, the contributions to N(E) from the entire fission-fragment mass and charge distributions will be calculated instead of calculating on the basis of a seven-point approximation to the peaks of these distributions as has been done in the past. Therefore, values of the energy release in fission, fission-fragment kinetic energy, nuclear level density, and compound nucleus cross section for the inverse process will be considered on a point-by-point basis over the fragment yield distributions instead of considering averages of these quantities over the peaks of the distributions. Particular attention will be given to the energy-dependent compound nucleus cross sections and to the nuclear level density model. Other refinements to the calculation of N(E) will also be discussed. Results will be presented and compared with earlier calculations of the spectrum and with recent experimental measurements of the spectrum. 9 figs.

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 7172411
• Report Number(s): LA-UR-88-1645; CONF-880546-10; ON: DE88010911
• Country of Publication: United States
• Language: English

Related Subjects

652020 -- Nuclear Properties & Reactions
A=220 & above
Experimental
653006* -- Nuclear Theory-- Spontaneous & Induced Fission
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
BARYONS
CALCULATION METHODS
CALIFORNIUM 252
CALIFORNIUM ISOTOPES
CHARGE DISTRIBUTION
DATA
DECAY
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY
EVEN-EVEN NUCLEI
FERMIONS
FISSION
FISSION FRAGMENTS
FISSION NEUTRONS
HADRONS
HEAVY NUCLEI
INFORMATION
ISOTOPES
KINETIC ENERGY
MASS DISTRIBUTION
NEUTRON SPECTRA
NEUTRONS
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
PROMPT NEUTRONS
RADIOISOTOPES
SPATIAL DISTRIBUTION
SPECTRA
SPONTANEOUS FISSION
THEORETICAL DATA
YEARS LIVING RADIOISOTOPES