Mössbauer Effect in Thulium 169

[摘要] The recoil-free resonance absorption phenomenon has beenused 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 producinga 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 surroundingelectrons and the crystal field. Arguments are given to show that the magnetic hyperfine interaction is expected to be negligible.

[发布机构] University:California Institute of Technology;Department:Physics, Mathematics and Astronomy

[关键词] Physics