Decay of 83Ym and 83Yg to Levels in 83Sr

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Abstract
The decays of 2.85 min 83Ym and of 7.06 min 83Yg have been investigated. Two photons are observed to be associated with the metastable decay, and one depopulates a 4.95 s metastable level at 259.3 keV in 83Sr. Seventeen γ rays are associated with the ground state decay, γ–γ coincidence and internal conversion measurements are carried out. Decay schemes are proposed with deduced log ft values for the various decay branches. Probable spin–parity assignments are given. The nature of the states involved are discussed within the context of the shell model.

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