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Published August 1, 1980 | public
Journal Article Open

Beta-alpha angular correlations in mass 8


A detailed study of the β∓-α angular correlations in the 8Li(β-) and 8B(β+) decays was performed. Since these decays proceed to the 2α continuum, detection of both alpha particles enabled determination of various correlations as functions of the final-state energy. The experimental results show a small (≈ 15% of weak magnetism) deviation from the conserved vector current prediction which is dependent on the final-state energy. An effect of this size cannot be interpreted as convincing evidence for the presence of second-class currents or a breakdown of conserved vector current theory. However, the inclusion of the vector second-forbidden terms in the nuclear weak current as predicted by the conserved vector current theory is crucial to obtain even approximate agreement with the experimental results.

Additional Information

© 1980 by The American Physical Society. Received 12 February 1980. We would like to acknowledge several enlightening conversations with Dr. B. Holstein and Dr. T. Bowles. The assistance of A. Davis during data acquisition is gratefully acknowledged. We would also like to thank the technical staff and Dynamitron operations staff at the Argonne Physics Division for their support. This work was performed under the auspices of the U.S. Department of Energy.


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