Calculation of /sup 235/U(n,n') cross sections for ENDF/B-VI

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

OSTI ID:7157348

Young, P G; Arthur, E D

Cross sections for neutron-induced reactions on /sup 235/U between 0.01 and 20 MeV have been calculated in a preliminary analysis for the ENDF/B-VI evaluation with particular emphasis on neutron inelastic scattering. A deformed optical model potential that fits total, elastic, inelastic, and low-energy average resonance data is used to calculate direct (n,n') cross sections and transmission coefficients for a Hauser-Feshbach statistical theory analysis using a multiple fission barrier representation. Direct cross sections for higher-lying vibrational states are provided from DWBA calculations, normalized using B(E/ital l/) values determined from (d,d') and Coulomb excitation data. Initial fission barrier parameters and transition state density enhancements appropriate to the compound systems involved were obtained from previous analyses, especially fits to charged-particle fission probability data. Further modifications to fit /sup 235/U(n,f) data were small, and the final fission parameters are generally consistent with published values. The results from this preliminary analysis are compared with the ENDF/B-V evaluation as well as with experimental data. 26 refs., 5 figs., 3 tabs.

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 7157348
• Report Number(s): LA-UR-88-1740; CONF-880546-27; ON: DE88014480
• Country of Publication: United States
• Language: English

Related Subjects

653003* -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BORN APPROXIMATION
CALCULATION METHODS
COUPLED CHANNEL THEORY
CROSS SECTIONS
DATA
FISSION FRAGMENTS
HADRON REACTIONS
HAUSER-FESHBACH THEORY
INELASTIC SCATTERING
INFORMATION
MATHEMATICAL MODELS
NEUTRON REACTIONS
NUCLEAR FRAGMENTS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEAR THEORY
NUCLEON REACTIONS
NUMERICAL DATA
SCATTERING
TARGETS
THEORETICAL DATA
URANIUM 235 TARGET