DECAY SCHEME OF EXCITED-STATES IN GE-67

Excited states in 67Ge were studied using the reaction 64Zn(alpha,n gamma ). Excitation functions for the production of 67Ge determined the Q value for this reaction to be -8993+or-5 keV. Neutron-gamma coincidences at Ealpha=15 MeV and gamma - gamma coincidences at Ealpha=13 and 15 MeV helped in the placing of 25 gamma rays into a decay scheme of 14 levels in 67Ge. The first excited state was placed at 18.3 keV and the 734 keV gamma 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 ( tau m=21.0+or-0.3 mu s) and 751.8 keV (taum=160+or-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 (Jpi= 9/2+) and the angular distribution and linear polarisation measured for the 734 keV gamma ray have limited the spin of the level at 1803 keV to 5/2with a proposed negative parity.