| Summary: | A long-lens type beta ray spectrometer was modified by the addition of a central electron-focusing coil to the system. An increase in the transmission of the spectrometer of over a factor of five was realized with small loss in resolution. Recently observed 10 and 15 hour osmium activities produced by proton bombardment of rhenium were studied with a gamma ray spectrometer, a 28 channel kicksorter, a 180° beta ray spectrograph, and a slow coincidence assembly, as well as with the improved spectrometer. Measurement of their relative field cross sections assigned the two activities to Os183, establishing the existence of an isomeric state.
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