Comparison of the Beta Spectra of B12 and N12

T. Mayer-Kuckuk and F. C. Michel
Phys. Rev. 127, 545 – Published 15 July 1962
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Abstract

The conserved-vector-current (CVC) theory predicts a deviation from the allowed shape of the B12 and N12 beta spectra. The ratio of the shape factors of the two spectra is expected to have an energy dependence of (1.10±0.17)% per MeV. If the CVC hypothesis is not invoked, this ratio is estimated to be an order of magnitude smaller. The two spectra have been measured with a magnetic spectrometer and found to give for this ratio the value (1.30±0.31)% per MeV. The branching fraction of the N12 decay to the 7.6-MeV state of C12 has been determined to be (3.0±0.5)%.

  • Received 12 March 1962

DOI:https://doi.org/10.1103/PhysRev.127.545

©1962 American Physical Society

Authors & Affiliations

T. Mayer-Kuckuk* and F. C. Michel

  • California Institute of Technology, Pasadena, California

  • *Now at the Max Planck Institut für Kernphysik, Heidelberg, Germany.

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Issue

Vol. 127, Iss. 2 — July 1962

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