The purpose of the work was a study of autoionization phenomenon following nuclear beta<sup>-</sup>-decay. Three approaches have been adopted in this respect, first, a study of total internal ionization probability and internal ionization probability as a function of beta<sup>-</sup>-particle energy, using a coincidence technique between emitted electrons (beta<sup>-</sup>-particles + orbital electrons) and subsequent K X-rays. Two isotopes have been studied using this approach, thallium-204 and promethium-147, where measurements of internal ionization probabilities for K-electrons are presented and results are discussed in terms of available theoretical treatments on total internal ionization. A second approach was applied in the case of thallium-204 where the internal ionization probability for K-electrons is deduced by comparison of mercury K X-rays resulting from an electron capture process with lead K X-rays due to the studied phenomenon. The third approach was applied in a measurement on erbium-169 using the straight forward technique of comparing the 118 Kev gamma-ray transition with thulium K X-rays and cn upper limit for K-shell internal ionization probability has been estimated. Difficulties and drawbacks of the experiment have been discussed. The two solid state detectors used in this work were a lithium drifted silicon detector for electrons and lithium drifted germanium X-ray detector for photons.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:448293 |
| Date | January 1975 |
| Creators | Ateek, Mariam Mokhtar |
| Publisher | Royal Holloway, University of London |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://repository.royalholloway.ac.uk/items/a6fc97c6-036a-4ad6-b10e-1563dbd76cab/1/ |
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