Gamma-rays from the 7.56 MeV LeVel in O15

概要

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The gamma-rays from the N14(p, γ)O15 reaction at the Ep=278 kev resonance, corresponding to the 7.56 MeV level in O15, were studied with a large crystal scintillation spectrometer. The direct ground state transition gamma-ray of about 3% in intensity of the total decay was found to exist in addition to the three known cascade lines. Angular distributions of these gamma-rays are all isotropic, supporting the Jπ=\frac12+ assignment to the resonance state. The transition strength (radiation width in units of Weisskopf single particle width) of the direct ground state transition El gamma-ray is calculated to be |M|2=4.15×10−6, which is by a factor of 10−4 smaller than the normal E1 transition strength found in light nuclei. Other transitions in O15 are estimated to be of normal strength compared with Wilkinson's estimation.
社団法人日本物理学会の論文