Energy Spectra of Inelastic Scattering of 28.4-MeV Alpha Particles

概要

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Thin targets of ^58<N>i, Cu, Ag, Ta and Au were bombarded with 28.4-MeV alpha particles and the energy spectra of emitted alpha particles were measured at several angles. The experimental values of the peak energies in the energy spectra at 150° arising from the compound-nucleus process were found to be in good agreement with the values of the Coulomb barrier height for an optical model potential. Prominent features of the energy spectra for Ag are as follows. The differential cross sections at a forward angle (30°) increase with alpha-particle energy, while those at backward angles (more than 90°) decrease with alpha-particle energy. At an intermediate angle (60°) between them, the energy spectrum is nearly flat. General features of the energy spectra for Ta and Au resemble those for Ag except for the low energy parts where the cross sections are decreased by the higher Coulomb barrier. These features may be explained by a mechanism which takes account of the collective excitation of the residual nucleus.
社団法人日本物理学会の論文
1967-08-05