K-electron capture to positron emission ratios in allowed transitions

Fitzpatrick, Margaret Lynne (1974) K-electron capture to positron emission ratios in allowed transitions. PhD thesis, University of Glasgow.

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Abstract

This thesis describes measurements of the ratios for the K/beta+ ratios for the decays of [30]P and [91]Mo to the ground states of [30]Si and [91]Nb, respectively, and the ft values of the weak transitions to excited states of these nuclei. It also contains a review of all available experimental values of K/beta+ and epsilon/beta[+] ratios for allowed transitions. The work was carried out at the Kelvin Laboratory, University of Glasgow, between October 1969 and October 1973, excluding the period from October 1971 to January 1972. The first chapter contains an introduction to beta decay theory. Orbital electron capture, particularly K-capture, is considered and a theoretical expression given for the ratio of K-electron capture to positron emission for allowed transitions. The following chapter examines the agreement between experimental and theoretical values of the K/beta+ ratio for nuclei with Z ≤ 15. The review of K/beta+ measurements in this region was carried out in collaboration with Ur K. W. D. Ledingham and Dr J. Y. Gourlay. The measurement of the K/beta+ of [30]P ratio described in this chapter was performed by Dr Gourlay and Lr Ledingham together with Dr J. G. Lynch. The present author assisted in the analysis of some of the data. A description of the [30]P experiment is included since it is typical of the low Z K/beta+ measurements and demonstrates the experimental techniques applicable in this region. The experimental K/beta+ ratios for the low Z region are compared with theoretical K/beta+ ratios calculated by the author and Dr Gourlay employing published tables of Fermi functions.

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Additional Information: Adviser: K W D
Keywords: High energy physics
Date of Award: 1974
Depositing User: Enlighten Team
Unique ID: glathesis:1974-74026
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 23 Sep 2019 15:33
Last Modified: 23 Sep 2019 15:33
URI: http://theses.gla.ac.uk/id/eprint/74026

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