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Title: High resolution gamma-ray spectroscopy of ⁷⁶As, ²⁰⁷Bi and ⁷⁵Se
Author: Thomas, Ruth Valerie
Awarding Body: University of London
Current Institution: Royal Holloway, University of London
Date of Award: 1973
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The decay schemes of 76As, 207Bi and 75Se have been studied using Ge(Li) detectors and coincidence techniques with particular emphasis on the weaker modes of gamma decay. The feasibility of detecting weak modes of gamma decay is discussed and supporting electronic systems which have been developed to yield data suitable for reduction and analysis with computer programmes are described. Low energy gamma transitions in the decay of 75Se were studied using an X-ray Ge(Li) detector. Two previouslyunconfirmed transitions at 24.4 keV and 80.8 keV have beendetected and their positions in the decay scheme of 76As have been established. In the decay of 207Bi, an upper limit of 0.014 +/- 0.008 relative to the 570 keV transition as 100 has been placed on the intensity of the 'l-forbidden' gamma transition at 328 keV. The decay scheme of 76As has been shown to include two previously unreported gamma-rays at 220 keV and 316 keV and coincidence experiments have indicated a new energy level at 2006 keV. Several gamma-rays and level energies suggested by previous authors were not confirmed by this work.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Nuclear Physics And Radiation