Abstract
The structure in the /beta/-delayed proton spectra of the precursors /sup 1//sub 66//sup 47/Dy/sup /ital g//, /sup 1//sub 68//sup 49/Er/sup /ital g//, and /sup 1//sub 70//sup 51/Yb/sup /ital g// is analyzed within the framework of a doorway-state model. Indications from /gamma/-ray decay studies, /beta/ strength-function measurements, and calculations of state densities and Gamow-Teller strength distributions, lead us to suggest that some of the observed proton transitions arise from the preequilibrium decay of doorway states populated in /beta//sup +/ decay or electron capture.
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