A simplified unified Hauser-Feshbach/Pre-Equilibrium model for calculating double differential cross sections

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

OSTI ID:5603311

Fu, C Y

A unified Hauser-Feshbach/Pre-Equilibrium model is extended and simplified. The extension involves the addition of correlations among states of different total quantum numbers (J and J') and the introduction of consistent level density formulas for the H-F and the P-E parts of the calculation. The simplification, aimed at reducing the computational cost, is achieved mainly by keeping only the off-diagonal terms that involve strongly correlated 2p-1h states. A correlation coefficient is introduced to fit the experimental data. The model has been incorporated into the multistep H-F model code TNG. Calculated double differential (n,xn) cross sections at 14 and 25.7 MeV for iron, niobium, and bismuth are in good agreement with experiments. In use at ORNL and JAERI, the TNG code in various stages of development has been applied with success to the evaluation of double differential (n,xn) cross sections from 1 to 20 MeV for the dominant isotopes of chromium, manganese, iron, nickel, copper, and lead. 11 refs., 2 figs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5603311
• Report Number(s): CONF-880232-2; ON: DE88005442
• Country of Publication: United States
• Language: English

Related Subjects

653003* -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BARYON REACTIONS
CALCULATION METHODS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
EMISSION
HADRON REACTIONS
HAUSER-FESHBACH THEORY
INFORMATION
NEUTRON EMISSION
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEAR THEORY
NUCLEON REACTIONS
NUMERICAL DATA
QUANTUM NUMBERS
THEORETICAL DATA