Isomeric cross-section ratio for the formation of /sup 73//sup m//sup ,//sup g/Se in various nuclear processes

Journal Article · Mon Aug 01 04:00:00 EDT 1988 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.38.645· OSTI ID:6951665

Qaim, S M; Mushtaq, A; Uhl, M

The isomeric cross-section ratio sigma/sub m//(sigma/sub m/+sigma/sub g/) for the formation of /sup 73//sup m//sup ,//sup g/Se was determined in the /sup 70/Ge(..cap alpha..,n) reaction over the energy range of 13--27 MeV, in the /sup nat/Ge(/sup 3/He,xn) process over 13--24 MeV, in the /sup 75/As(p,3n) reaction over 25--45 MeV, and in the /sup 75/As(d,4n) reaction over 28--56 MeV. Measurements were done radiochemically using the ''stacked-foil'' technique. In (..cap alpha..,n) and (/sup 3/He,xn) processes the ratio is relatively high at low incident particle energies but decreases with increasing energy. In (p,3n) and (d,4n) reactions, on the other hand, it is practically constant. Statistical model calculations taking into account precompound emission were carried out on the four processes investigated in this work as well as on the /sup 74/Se(n,2n) reaction reported in the literature. The total cross section (sigma/sub m/+sigma/sub g/) is described well by the calculation. The calculated isomeric cross-section ratio depends strongly on the input level scheme of the product nucleus. In general, however, the statistical model, under a suitable set of global assumptions, can reproduce the isomeric cross-section ratio in all the five nuclear processes.

• Research Organization: Institut fuer Chemie 1 (Nuklearchemie), Kernforschungsanlage Juelich GmbH, D-5170 Juelich, Federal Republic of Germany
• OSTI ID: 6951665
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 38:2; ISSN PRVCA
• Country of Publication: United States
• Language: English

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