Level Structure of ⁸²Kr

抄録

The level structure of ⁸²Kr, from the decay of 35.3 h ⁸²Br, has been investigated using a 64.1 cc Ge(Li) detector (FWHM≈2.1 keV at 1.33 MeV) in singles mode and Ge(Li)–NaI(Tl) (64.1 cc and 3″×3″ respectively) detector set-up in coincidence mode (2τ=6 nsec). These measurements confirmed the existence of 129.22, 180.5, 280.8, 332.5, 470.28, 735.7, 1 173.3, 1427.2 and 1871.7 keV weak gamma ray transitions, while the 345.65, 599.5, 625.5, 692.7, 726.8 and 932.1 keV gamma rays reported earlier, could not be observed.
The gamma-gamma directional correlation measurements have been done on 15 cascades, out of which the 221–(606)–1044, 273–1014, 606–1044 and 221–1650 keV cascades have been attempted for the first time. Based on these measurements, the spin 3⁺ has been confirmed for the 2426.79 keV level in ⁸²Kr. Also the multipole admixtures in the 221.34, 273.45, 606.30, 619.07, 698.32, 827.81, 1007.57, 1043.98, 1317.46 and 1650.28 keV gamma transitions have been evaluated.