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AbstractAbstract
[en] The angular distributions of tritons from the 6Li(n,t)4He reaction were measured at E/sub n/ = 7.25, 6.77, 6.57, 5.24, and 4.71 MeV and found to be less forward peaked at 5.24 and 4.71 MeV than at the higher energies. Angular distributions of deuterons from respectively, the 6Li(n,d)5He two-body breakup reaction were measured at E/sub n/ = 6.77 and 6.57 MeV, and of protons from the 6Li(n,p)6He reaction at E/sub n/ = 6.77, 5.24 and 4.71 MeV. All these reactions in 6Li were analyzed as direct interaction in the formalism of distorted wave Born approximation. The optical model for the nuclear interaction was found to apply reasonably well to nuclei as light as 4He, 5He, 6He and 6Li. In addition, 6Li as an alpha-deuteron cluster gives the best bound-state wave function to describe the experimental angular distribution of tritons. In the 6Li(n,d)5He reaction, the ratio of two-body breakup to three-body breakup is found to be about 0.3 at E/sub n/ = 6.77 MeV but it decreases at lower incident neutron energies. Neutron-induced charged-particle reactions in 9Be were studied at E/sub n/ = 18.3 MeV. In this case the differential cross section is quite small, and backgrounds comparatively high, so that the angular range was limited to less than 600. Over the limited angular range, the 9Be(n,t)7Li reaction angular distribution is approximately isotropic, while in the 9Be(n,p)9Li reaction is forward peaked. The distorted wave Born approximation accounts fairly well for the results. The excitation functions at forward angles of the 6Li(n,t)4He, 6Li(n,d)5He and 6Li(n,p)6He reactions were measured for energies between 4.4 and 7.3 MeV. The 6Li(n,d)5He (two-body breakup) cross section decreases rapidly when the incident neutron energy decreases showing a threshold at about 5.3 MeV, which we speculate may be related to the half life of the product nucleus, 5He
Original Title
DWBA, optical model analyses, excitation functions, angular distributions
Primary Subject
Source
1976; 157 p; University Microfilms Order No. 76-11,959.; Thesis (Ph. D.).
Record Type
Report
Literature Type
Thesis/Dissertation
Country of publication
Reference NumberReference Number
INIS VolumeINIS Volume
INIS IssueINIS Issue