The ratio of K-electron capture to positron emission in the decay of91Mo

Abstract
The K-capture to positron emission ratio (PK/Pbeta +) for the decay of 91Mo to the ground state of 91Nb has been measured and found to be about 9% lower than the theoretical value. This tends to agree with a recent review which indicated that experimental PK/Pbeta + ratios disagree with theory, particularly for high-Z nuclei.
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