Calculation of /sup 239/Pu neutron inelastic cross sections

Conference · Fri Jan 01 04:00:00 EST 1982

OSTI ID:7059868

Arthur, E D

We have calculated cross sections for neutron-induced reactions on /sup 239/Pu between 0.001 and 5 MeV, with particular emphasis on inelastic scattering. Coupled-channel and Hauser-Feshbach statistical models were used. Within the coupled-channel calculations we employed neutron optical parameters derived from simultaneous fits to total, elastic, inelastic, and resonance data. The resulting transmission coefficients were used in Hauser-Feshbach statistical calculations having a fission channel based on a double-humped barrier representation. Barrier parameters and transition state enhancements needed to reproduce well the (n,f) cross sections between 0.001 and 5 MeV were in general agreement with those from other published analyses. Calculated compound-nucleus and direct-reaction components for inelastic scattering were combined incoherently, and the resultant cross sections agreed well with the Bruyeres-le-Chatel measurements for scattering from levels occupying the ground state rotational band. Our results are in substantial disagreement with ENDF/B-V values for these levels. We are presently performing DWBA calculations to determine direct-reaction components for states occupying higher-lying vibrational bands.

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 7059868
• Report Number(s): LA-UR-82-2643; CONF-820942-10; ON: DE83000662
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BORN APPROXIMATION
COMPOUND-NUCLEUS REACTIONS
COUPLED CHANNEL THEORY
CROSS SECTIONS
DATA
DIRECT REACTIONS
DWBA
ELASTIC SCATTERING
ENERGY LEVELS
ENERGY RANGE
EXCITATION FUNCTIONS
EXCITED STATES
FISSION
FISSION BARRIER
FUNCTIONS
HADRON REACTIONS
HAUSER-FESHBACH THEORY
INELASTIC SCATTERING
INFORMATION
KEV RANGE
MEV RANGE
MEV RANGE 01-10
NEUTRON REACTIONS
NUCLEAR POTENTIAL
NUCLEAR REACTIONS
NUCLEAR THEORY
NUCLEON REACTIONS
NUMERICAL DATA
PLUTONIUM 239 TARGET
POTENTIALS
SCATTERING
TARGETS
THEORETICAL DATA
TOTAL CROSS SECTIONS
VIBRATIONAL STATES