Co^<59>(η,α)Mn^<56> and Mn^<55>(η,α)V^<52> Reactions Induced

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The angular and energy distributions of alpha particles resulting from Co^<59>(η,α)Mn^<56> and Mn^<55>(η,α)V^<52> reactions induced by 14.8-Mev neutrons were measured with Ilford C2 nuclear plates. As in the case of Al^<27>(η,α)Na^<24> reaction, the angular distributions for the entire energy region are approximately 90° symmetrical and concave upward, and the energy distributions show that the alpha particles with energies below the Coulomb barrier are more emitted than has been expected. The curves on a semilog plot of the relative level density calculated from the energy distributions of the alpha particles cannot fit a straight line. The total (η,α) cross sections of cobalt and manganese are 84mb±15% and 96mb±15% respectively. The results are compared with the predictions of the statistical theory of nuclear reactions.
社団法人日本物理学会の論文
1958-02-05