Gamma Rays from the Proton Bombardment of ^24<M>g, ^25<M>g and ^26<M>g

概要

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The gamma-rays following the inelastic scattering of protons by ^24<M>g, ^25<M>g and ^26<M>g were investigated at proton energies up to 5.7MeV. The energy spectra of the gamma-rays at several proton energies have been obtained for each isotopes. 2^+ was assigned to the second, third and fourth excited level of ^26<M>g considering the gamma-ray branching ratios for those levels. The yields of gamma-rays from the first excited levels were found to have peaks at proton energies of 4.0, 4.6 and 5.05MeV for ^24<M>g(p, p'γ) reaction, 4.9 and 5.4MeV for ^25<M>g(p, p'γ) reaction respectively. These resonances correspond to the levels at 6.1, 6.7 and 7.14MeV for ^25<A>l, and 13.0 and 13.5MeV for ^27<A>l. To determine the spins for those levels, angular distributions were measured at resonance energies. Spin values of 3/2 and 5/2 are probable for 7.14MeV level in ^25<A>l and 13.0MeV level in ^27<A>l respectively. For the 13.5MeV level in ^27<A>l, the spin of 3/2 is also probable, but 5/2 can not be excluded because of the presence of the cascade gamma-rays from higher levels. The total cross sections for the gamma-ray emission are estimated to be about 700mb at 5.05MeV resonance for ^24<M>g and a few hundreds mb for the 4.9 and 5.4MeV resonances for ^26<M>g.
社団法人日本物理学会の論文
1959-03-05