Photodisintegration of ^<40>Ca

概要

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Energy and angular distributions of the photoprotons from the ^<40>Ca(γ,p)^<39>K reaction have been measured using the bremsstrahlung beams with the end point energies of 25.5, 23.0, 20.5 and 18.0 MeV from a 31 MeV betatro. The dipole strengths are concentrated in the giant resonance region and are devided into seven peaks at 18.1, 18.7, 19.2, 19.9, 20.4, 20.9 and 21.5 MeV, rather strongly at 18.7, 19.2, 19.9 and 20.4 MeV. No significant peaks are observed above 22.5 MeV, which indicate that the absorptions in this energy region mainly lead the residual nucleus to the excited states and hardly to the ground. The asymmetric angular distributions around 90° observed in both sides of the giant resonance region suggest the existance of the absorption of M1 or E2. Collective correlation must be added to the shell model in order to explain the experimental results.
社団法人日本物理学会の論文
1971-11-05