The 7-ray spectrum from the decay of "'I was measured with smalland large-volume, high-resolution Ge(Li) detectors, and 116transitions were assigned in its decay. Selected regions of the conversion-electron spectrum were measured with an iron double-focusing spectrometer. The IC-conversion coefficient of the 772-keV transition that was measured relative to the X-conversion coefficient of the 662-keV transition in '"Ba was used to normalize the electron and y spectra to obtain the K-conversion coefficients of the 262., and. 1398. 6-keV transitions. Conversion coeKcients of additional transitions were obtained from electron intensities of other work. From these conversion coeKcients, each of the above transitions was assigned an bI1 and/or Z2 multipolarity.

We report the results of a Mössbauer study of 57Co(57Fe) in CoSO4 as a function of temperature at atmospheric pressure and as a function of pressure at room temperature. In addition to the expected divalent 57Fe component, one also observes a trivalent component, the relative intensity of which decreases with increasing temperature or pressure. The isomer shifts of both charge states also decrease with increasing temperature or pressure. The behavior of the large quadrupole splittings observed in each charge state is analyzed using the crystal field approximation. We also find similar results in a temperature study of CoSO4·7H2O at atmospheric pressure. The relative intensity of the trivalent 57Fe component is considerably greater in the hydrate and also decreases with increasing temperature.

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