Abstract
BS>Se/sup 83/ was produced by irradiation of a selenium sample, enriched to 75% in Se/sup 82/, in the Pennsylvania State University research reactor. The gamma-ray spectrum of the 25-minute isomer was investigated by means of a 3-in. thick x 3-in. diameter NaI(Tl) crystal scintillation spectrometer. Gamma rays of 2.294 sintering time (0.833 sintering time 0.005, 0.712 sintering time 0.010, 0.524 sintering time 0.012, 0.358 sintering time 0.005, and 0.225 sintering time 0.005 Mev were found. The beta-ray spectrum was investigated by means of a plastic scintillator. In order to eliminate a competing activity from Se/sup 81/ it was found essential to restrict the observation of beta rays to those in coincidence with the Se/sup 83/ gamma spectrum. A coincidence circuit of 0.25microsecond resolving time was developed for this purpose. The beta spectrum was found to be complex with end-point energies of approximately 0.45, 1.0, and 1.7 Mev. From these data, together with gammagamma coincidence measurements, a decay scheme is proposed. (auth)
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