Decay scheme of excited states in67Ge

Publisher Website
Google Scholar
Abstract
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 ( tau m=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 5/2 with a proposed negative parity.