Evaluation of the thermal-neutron constants for /sup 233/U, /sup 235/U, /sup 239/Pu and /sup 241/Pu

Technical Report · Thu Dec 31 23:00:00 EST 1981

DOI:https://doi.org/10.2172/6848400· OSTI ID:6848400

Stehn, J R; Divadeenam, M; Holden, N E

A consistent set of best values of the 2200 meter/second neutron cross sections, Westcott g-factors, and fission neutron yields for /sup 233/U, /sup 235/U, /sup 239/Pu and /sup 241/Pu are presented. A least squares fitting program, LSF, is used to obtain the best fit and to estimate the sensitivity of these fissile parameters to the quoted uncertainties in experimental data. The half-lives of the uranium and plutonium nuclides have been evaluated and these have been used to reassess the significant experimental data. The latest revision of the spontaneous fission neutron yield anti nu, of /sup 252/Cf and the foil thickness corrections to the fission neutron yield ratios of fissile nuclei to /sup 252/Cf are included. These lead to greater consistency in the data used for anti nu (/sup 252/Cf). Similarly, the /sup 234/U half-life as revised leads to improved consistency in the /sup 235/U fission cross section. Comparison is made with the values from ENDF/B-V and other evaluations.

• Research Organization: National Nuclear Data Center, Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6848400
• Report Number(s): BNL-NCS-31878; CONF-820942-21; ON: DE83000974
• Country of Publication: United States
• Language: English

Related Subjects

652025 -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Nuclear Reactions & Scattering-- (-1987)
652026* -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Spontaneous & Induced Fission-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
BARYON REACTIONS
BARYONS
CALIFORNIUM 252
CALIFORNIUM ISOTOPES
CROSS SECTIONS
DATA
DECAY
ELEMENTARY PARTICLES
EMISSION
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
FERMIONS
FISSION
FISSION NEUTRONS
HADRON REACTIONS
HADRONS
HALF-LIFE
HEAVY NUCLEI
INFORMATION
ISOTOPES
LANDE FACTOR
MULTIPLICITY
NEUTRON EMISSION
NEUTRON REACTIONS
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
NUMERICAL DATA
PLUTONIUM 239 TARGET
PLUTONIUM 241 TARGET
RADIOISOTOPES
SCATTERING
SPONTANEOUS FISSION
TARGETS
THERMAL FISSION
THERMAL NEUTRONS
URANIUM 233 TARGET
URANIUM 235 TARGET
YEARS LIVING RADIOISOTOPES