Gyromagnetic Ratio of the 129-keV State in Iridium-191

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Abstract
The properties of the 82.4- and 129-keV levels of iridium-191 have been studied following electron capture in three-day platinum-191. The mean life of the 82.4-keV state was electronically measured to be 5.5±0.5 nsec; this was confirmed by the observation of a single-line Mössbauer spectrum of a corresponding width. A lower limit of 144±10 psec was established for the mean life of the 129-keV level by a Mössbauer-effect experiment. The gyromagnetic ratio of the 129-keV state was determined by a perturbed angular correlation of the 410-129-keV cascade with a source of platinum-191 diffused into an iron foil; the effective magnetic field at the iridium nucleus in this sample was measured by a Mössbauer-effect observation of the nuclear Zeeman effect of the 82.4-keV transition. The gyromagnetic ratio of the 129-keV state is +0.22±0.02. The observed magnetic moments of the ground state and of the 129-keV state and the magnetic dipole transition probability of the 129-keV state are inconsistent with the simple rotational model for iridium-191.

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