Department of Chemistry, Simon Fraser University, Burnaby 2, B.C., Canada
Abstract:
The energies and relative intensities of γ-rays following the β-decay of 78As (and 76As) to levels in 78Se (and 76Se) have been measured using an 8 cm3 Ge(Li) spectrometer. The β-decay of 78As has been measured using a superconducting magnet beta-ray spectrometer with two 3 mm thick Si(Li) detectors. These data plus β-γ and γ-γ coincidence results have been used to construct a level scheme with 18 excited levels in 78Se. The half-life of 78As was measured to be 90.7±0.2 min.