Computational comparison of quantum-mechanical models for multistep direct reactions

Journal Article · Mon Feb 01 00:00:00 EST 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.47.724· OSTI ID:6785566

Koning, A J; Akkermans, J M ^[1]

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1. Netherlands Energy Research Foundation, 1755 ZG Petten (Netherlands)

We have carried out a computational comparison of all existing quantum-mechanical models for multistep direct (MSD) reactions. The various MSD models, including the so-called Feshbach-Kerman-Koonin, Tamura-Udagawa-Lenske and Nishioka-Yoshida-Weidenmueller models, have been implemented in a single computer system. All model calculations thus use the same set of parameters and the same numerical techniques; only one adjustable parameter is employed. The computational results have been compared with experimental energy spectra and angular distributions for several nuclear reactions, namely, [sup 90]Zr([ital p],[ital p][prime]) at 80 MeV, [sup 209]Bi([ital p],[ital p][prime]) at 62 MeV, and [sup 93]Nb([ital n],[ital n][prime]) at 25.7 MeV. In addition, the results have been compared with the Kalbach systematics and with semiclassical exciton model calculations. All quantum MSD models provide a good fit to the experimental data. In addition, they reproduce the systematics very well and are clearly better than semiclassical model calculations. We furthermore show that the calculated predictions do not differ very strongly between the various quantum MSD models, leading to the conclusion that the simplest MSD model (the Feshbach-Kerman-Koonin model) is adequate for the analysis of experimental data.

• OSTI ID: 6785566
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Vol. 47:2; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BISMUTH 209 TARGET
NIOBIUM 93 TARGET
DIRECT REACTIONS
QUANTUM MECHANICS
NUMERICAL ANALYSIS
PROTON REACTIONS
ZIRCONIUM 90 TARGET
ANGULAR DISTRIBUTION
ENERGY SPECTRA
INELASTIC SCATTERING
MEV RANGE 10-100
NEUTRON REACTIONS
STATISTICAL MODELS
BARYON REACTIONS
CHARGED-PARTICLE REACTIONS
DISTRIBUTION
ENERGY RANGE
HADRON REACTIONS
MATHEMATICAL MODELS
MATHEMATICS
MECHANICS
MEV RANGE
NUCLEAR REACTIONS
NUCLEON REACTIONS
SCATTERING
SPECTRA
TARGETS
663300* - Nuclear Reactions & Scattering
General- (1992-)
663430 - Nucleon-Induced Reactions & Scattering- (1992-)
663560 - Nuclear Mass Ranges- A=90-149- (1992-)
663580 - Nuclear Mass Ranges- A=190-219- (1992-)