Extended Hauser-Feshbach method for statistical binary decay of light-mass systems

Journal Article · Sat Mar 01 04:00:00 EST 1997 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.55.1380· OSTI ID:513485

Matsuse, T; Beck, C; Nouicer, R; Mahboub, D ^[1]

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1. Centre de Recherches Nucleaires, Institut National de Physique Nucleaire et de Physique des Particules--Centre National de la Recherche Scientifique/Universite Louis Pasteur, B.P. 28, F-67037 Strasbourg Cedex 2 (France)

An extended Hauser-Feshbach method (EHFM) is developed for {bold {ital light}} heavy-ion fusion reactions in order to provide a detailed analysis of all the possible decay channels by including explicitly the fusion-fission phase space in the description of the cascade chain. The mass-asymmetric fission component is considered as a complex-fragment binary decay which can be treated in the same way as the light-particle evaporation from the compound nucleus in statistical-model calculations. The method of the phase-space integrations for the binary decay is an extension of the usual Hauser-Feshbach formalism to be applied to the mass-symmetric fission part. The EHFM calculations include ground-state binding energies and discrete levels in the low-excitation-energy regions which are essential for an accurate evaluation of the phase-space integrations of the complex-fragment emission (fission). In the present calculations, the EHFM is applied to the first-chance binary decay by assuming that the second-chance fission decay is negligible. In a similar manner to the description of the fusion-evaporation process, the usual cascade calculation of light-particle emission from the highly excited complex fragments is applied. This complete calculation is then defined as EHFM+CASCADE. Calculated quantities such as charge-, mass, and kinetic-energy distributions are compared with inclusive and/or exclusive data for the {sup 32}S+{sup 24}Mg and {sup 35}Cl+{sup 12}C reactions which have been selected as typical examples. Finally, the missing charge distributions extracted from exclusive measurements are also successfully compared with the EHFM+CASCADE predictions. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 513485
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 3 Vol. 55; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BINARY FISSION
BINDING ENERGY
CARBON 12 TARGET
CHARGE DISTRIBUTION
CHLORINE 35 REACTIONS
COMPOUND NUCLEI
EVAPORATION
EXCITATION
FISSION FRAGMENTS
FISSION PRODUCTS
HAUSER-FESHBACH THEORY
HEAVY ION FUSION REACTIONS
KINETIC ENERGY
MAGNESIUM 24 TARGET
MASS
PHASE SPACE
STATISTICAL MODELS
SULFUR 32 REACTIONS