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Gamma-ray-multiplicity measurements for ($alpha$,p), ($alpha$$,$$alpha$'), (d,$alpha$), (p,$alpha$), (d,p), and (p,p') reactions

Journal Article · · Phys. Rev., C, v. 8, no. 6, pp. 2255-2266
OSTI ID:4343422
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Using a method introduced previously measurement were made of the gamma -ray multiplicity N/sub gamma / (the average number of gamma rays emitted in t he decay of residual nuclei left by nuclear reactions) as a function of excitation energy E/sup */ for (p, a) and (d, alpha ) reactions on /sup 51/V, / sup 56/Fe, and /sup 57/Fe targets- ( alpha , p) reactions on /sup 51/V, /sup 56/ Fe, /sup 57/Fe, /su p 58/Ni, /sup 64/Ni, /sup 93/Nb, and Ag; ( alpha , a') reactions on /sup 51/V, /sup 56/Fe, /sup 57/Fe, /sup 59/Co, and /s up 64/Ni; (d, p) reactions on /sup 51/V, /sup 55/Mn, /sup 56/Fe, Ag, and /sup 119/Sn; and p, p') reactions on /sup 56/Fe, /sup 112/Sn, and /sup 122/Sn. Bombarding emergies ranged from 12 to 19 MeV. N/sub gamma / was observed to be generally between 1 and 5 for E/sup */ between 3 and 10 MeV for the (p, p'), (d, p), (d, alpha ), (p, alpha ), and ( alpha , alpha ') reaction s investigated, and somewhat higher for the ( alpha , p) reactions. N, increases with E/sup */, and is larger for higher angular momentum transfer reactions although it is not as much larger as angular momentum transfer considerations alone would suggest. This can be explained as a level-density effect for compound-nucleus reactions--the average angular momemtum of the states excited by the reactions is severely limited by the level-density spin-cutoff parameter.) The dependence of N/sub gamma / on the average excess angular momentum of the residual nuclei was investigated using calculated spin distributions for the residual nuclei. This dependence is similar to that for neutron capture N/sub gamma /'s--N/sub gamma /e incr eases with excess angular momenta for excess angular momenta of more than 2 or 3 units. (auth)
Research Organization:
Nuclear Physics Laboratory, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
NSA Number:
NSA-29-022918
OSTI ID:
4343422
Journal Information:
Phys. Rev., C, v. 8, no. 6, pp. 2255-2266, Journal Name: Phys. Rev., C, v. 8, no. 6, pp. 2255-2266; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

ALPHA REACTIONS-- COMPOUND-NUCLEUS REACTIONS-- INELASTIC SCATTERING
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MEV RANGE 10-100
MULTIPLICITY COMPOUND-NUCLEUS REACTIONS-- INELASTIC SCATTERING-- PROTON REACTIONS
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