Abstract

A discussion of the total intensities of isovector excitations in nuclei is presented. In addition to transitions of the electromagnetic type leading to states in the same nucleus, single charge transfer processes leading to states in the neighbouring nuclei are considered. In nuclei with an excess of neutrons, the three intensities are not simply related by rotations in isospin space. The relation of these intensities to the excitation strengths to states of definite isospin T, T+1, and T − 1 is studied and explicit estimates are given for the case of transitions of the electric dipole type.

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