Measurement of gamma ray transitions in Se76 and Ge72 using a dual-parameter collection system

The states populated in the beta decay of As76 and Ga 72 were investigated by measuring the gamma-ray transitions in Se 76 and Ge72 using 25cc., 33cc. and 60cc. true-coaxial Gs(Li) detectors.;Coincidence experiments were performed with the 25cc. and 33cc. Ge(Li) detectors using the conventional fast-slow system in the case of As 76 and the dual-parameter system was used in coincidence work on Ga 72 employing the 33cc. and 60cc. detectors.;The energies and intensities of measured gamma-rays were determined. The level schemes were constructed and the log ft and parity were deduced. The collective aspects of certain states were discussed and some comparisons with the pure vibrational and two other collective models were attempted.;A dual-parameter data collection system was constructed to study gamma-gamma coincidence. Options were provided to enable corrections of the undesired contributions from Compton background and chance coincidences. Its performance was shown to be very reliable and effective.