The Electric-Octupole Transitions of Nuclei

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Abstract
The j-forbidden electric octupole transitions of nuclei are explained on the basis of configuration mixing. The main contributions to the matrix element of the j-forbidden electric octupole transitions come from a proton transition for odd proton nuclei, and from both proton and surfon transitions for odd neutron nuclei. In the case of a proton transition, the allowed matrix element is of the first order for odd proton nuclei. For odd neutron nuclei, the mixing of proton configuration must be taken into account. The matrix element for a proton transition is of the second order. The allowed matrix element for a surfon transition is also of the second order. The calculations are based upon the perturbation theory. The agreement between the calculated and observed lifetimes are qualitatively good.

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