The decay of 23.0 min 79Rb to levels in 79Kr

Abstract The radioactive decay of 79 Rb (23.0±0.5 min) has been studied with the aid of semiconductor radiation detectors. Both singles and coincidence spectra have been recorded. The decay energy: 3520±45 keV was determined by measuring the endpoint of the positon spectrum in coincidence with prominent γ-rays. A decay scheme is proposed incorporating most of the measured γ-rays. The following energies in keV and parities of levels are assigned: ground state ( 1 2 − ), 130.01±0.12( 7 2 + ) , 147.3±0.7( 5 2 − ) , 182.4±0.5 3 2 + ) , 291.4±0.7( 5 2 − ) , 383.71±0.18, 532.82±0.33, 688.21±0.09, 751.7±0.7( 5 2 − ) , 934.0±1.4, 1089.4±0.4, 1474.7±0.3. The spin and parity of the 79 Rb ground state is most probably 3 2 − .