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Title: On the theory of beta-radioactivity
Author: Smith, A. M.
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 1952
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The theory of beta-radioactivity has been developed for a linear combination of the five usual forms of interaction and the resulting modifications to the energy distribution of the emitted radiation have been determined. The linear combination has been restricted in such a way that those explanations of beta spectra, allowed and forbidden, which have already been established with a particular form of the interaction, remain valid. A critical examination of the beta spectra of P32, Tc99, Sn125, Tm170, Tl204 and Rae, so far unexplained, has been carried out, making reasonable assumptions about spin and parity changes. On the basis of this discussion it is concluded that the interaction can only be a mixture of vector and tensor forms. Furthermore, the arbitrariness in the theoretical predictions has been reduced for two nuclei by evaluation of the nuclear matrix elements involved, using a simple model of the nucleus. By comparing these predictions with experiment an attempt has been made to determine the actual form of the interaction. The conclusion is that the interaction is a mixture of vector and tensor forms in the approximate ratio of two to one.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available