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- W1609361305 abstract "This thesis, Beta Spectra of the Mass 12 Nuclei, is mainly concerned with an experimental test of the conserved-vector-current theory. This theory predicts a deviation from the allowed shape of the B12 and N12 beta spectra. The ratio of the shape factor of the two spectra is expected to have an energy dependence of 1.10 ± 0.17 percent 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 percent per Mev. In addition the branching fraction of the N12 decay to the 7.6-Mev state of C12 has been determined to be 3.0 ± 0.5 percent. The geometrical mean of the two shape factors was observed to have an unexpected linear energy dependence of 1.18 percent per Mev. Theoretical estimates are made of relevant matrix elements in search of an understanding of this. Baffle penetration by the beta particles gives a systematic effect estimated to account for about one third of the observed mean shape factor. The uncertainty in this estimate precludes a definite conclusion on the actual presence of this term in the spectra. Such penetration is expected, however, to have little influence on the conserved vector current theory test. A preliminary report of this work has been published (1, 2)." @default.
- W1609361305 created "2016-06-24" @default.
- W1609361305 creator A5030738597 @default.
- W1609361305 date "1962-01-01" @default.
- W1609361305 modified "2023-09-27" @default.
- W1609361305 title "The Beta Spectra of the Mass 12 Nuclei" @default.
- W1609361305 doi "https://doi.org/10.7907/4bw8-8827." @default.
- W1609361305 hasPublicationYear "1962" @default.
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