A unified-Hauser-Feshbach and exciton model for calculating double-differential cross sections of neutron-induced reactions below 20 MeV

Journal Article · Sat May 01 04:00:00 EDT 1993 · Nuclear Science and Engineering; (United States)

DOI:https://doi.org/10.13182/NSE93-3· OSTI ID:6522477

Zhang, Jingshang ^[1]

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1. China Inst. of Atomic Energy, Beijing (China)

The master equation theory of precompound and compound nuclear reactions has been generalized to include the conservation of angular momentum and parity. Based on this improved semiclassical theory, the UNF code has been developed as a tool for calculating nucleon-induced reaction cross sections and double-differential cross sections at incident neutron energies below 20 MeV. It is demonstrated that the code contains the Hauser-Feshbach model and the exciton models as the limiting cases. The unified treatment of equilibrium and pre-equilibrium reaction processes includes the introduction of composite particle formation factors in calculations of pickup-type composite particle emissions. A method to calculate the double-differential cross sections for all kinds of particles is proposed based on the leading particle model.

• OSTI ID: 6522477
• Journal Information: Nuclear Science and Engineering; (United States), Journal Name: Nuclear Science and Engineering; (United States) Vol. 114:1; ISSN NSENAO; ISSN 0029-5639
• Country of Publication: United States
• Language: English

Related Subjects

663430* -- Nucleon-Induced Reactions & Scattering-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BARYON REACTIONS
COMPOUND-NUCLEUS REACTIONS
COMPUTER CODES
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ENERGY RANGE
EXCITON MODEL
HADRON REACTIONS
HAUSER-FESHBACH THEORY
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
NEUTRON REACTIONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEAR THEORY
NUCLEON REACTIONS
PRECOMPOUND-NUCLEUS EMISSION
SEMICLASSICAL APPROXIMATION
U CODES