Phys. Rev. 127, 545–554 (1962)Comparison of the Beta Spectra of B12 and N12Received 12 March 1962; published in the issue dated July 1962 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)%. © 1962 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRev.127.545
DOI:
10.1103/PhysRev.127.545
PACS:
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