Interpretation on Nitrogen- and Proton-Induced Nuclear Reactions

概要

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Excitation functions for α-, 2p- and 2α-emissions are calculated on the basis of the compound nucleus formalism for both of nitrogen-induced reactions on ^<12>C and proton-induced reactions on ^<25>Mg. The results are compared with the observed excitation curves in respective cases. A good agreement between the theoretical and the experimental results in(p ; 2p), (p ; α)and(p ; 2α)reactions indicates that the evaporation theory is valid for explaining the intermediate energy reactions even in those light nuclei. The overall behaviour of observed(N ; α)and (N ; 2p)excitation curves is in agreement with those obtained by the calculation and suggests that some sort of compound nucleus is formed in the nitrogen induced reaction. However the large magnitude of(N ; 2α)cross section cannot be explained by the successive of two alpha particles, if the first alpha particle emerges from the conglomorate nucleus proceeding toward the complete compound state. Hence the large(N ; 2α)cross section is regarded as due to direct processes such as alpha-capture or stripping. The occurrence of direct processes may explain a small discrepancy in the shape of(N ; α)excitation curve at high incident energies.
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