Mössbauer Effect in Thulium 169

Citation

Cohen, Richard Lewis (1962) Mössbauer Effect in Thulium 169. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/F7HD-FD14. https://resolver.caltech.edu/CaltechTHESIS:07262011-095356834

Abstract

The recoil-free resonance absorption phenomenon has been used to study the 8.4 kev gamma ray which is emitted in the decay of the first excited state of Tm^(169) which is populated by the beta decay of Er^(169) . With sources and absorbers in various chemical forms, hyperfine structures which are strongly temperature dependent have been obtained. These have been studied with the aim of producing a source emitting an unsplit line. The observed absorption patterns are explained on the basis of a quadrupole interaction resulting from the interaction of the nuclear quadrupole moment of the excited state of Tm^(169) with the electric field gradient produced by the surrounding electrons and the crystal field. Arguments are given to show that the magnetic hyperfine interaction is expected to be negligible.

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