K-shell ionisation in the positron decay branch of68Ga

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Abstract
The number of K-shell vacancies produced per positron emitted in the beta + decay branch of 68Ga has been found to be (10.3+or-1.0)*10-4. This is 50% higher than the prediction of the theory of Law and Suzuki, which has proved successful in beta - decay, and confirms the trend of the experimental results obtained in the three other positron decays which have so far been investigated. The importance of the final-state interaction in beta + decay has recently been shown theoretically by Intemann and by Batkin et al., and a successful theory will probably require a combination of their approach with that of Law and Suzuki, which emphasises many-body effects.