Decay scheme of excited states in 67Ge

Excited states in 67Ge were studied using the reaction 64Zn(α, n γ). Excitation functions for the production of 67Ge determined the Q value for this reaction to be -8993 +- 5 kev. Neutron-gamma coincidences at Esub(α) = 15 MeV and γ-γ coincidences at Esub(α) = 13 and 15 MeV helped in the placing of 25 γ rays into a decay scheme of 14 levels in 67Ge. The first excited state was placed at 18.3 kev and the 734 kev γ ray has been identified as a decay from a level at 751.8 kev to the 18.3 kev level. The mean lifetimes of the isomeric states at 18.3 kev (tausub(m) = 21.0 +- 0.3 μs) and 751.8 kev (tausub(m) = 160 +- 2 ns) have been determined by pulsed-beam techniques, the decay of the 18.3 kev state being detected by x-ray detection. The mean lifetime of the level at 751.8 kev (Jsup(π) = 9+/2) and the angular distribution and linear polarisation measured for the 734 kev γ ray have limited the spin of the level at 1803 kev to 5/2 with a proposed negative parity. (author)