TRIAXIALITY AND ISOSPIN-FORBIDDEN E1 DECAYS IN THE N = Z NUCLEUS GE-64

The neutron-deficient isotope G-64(32)32 was produced in the reaction C-12(Fe-54, 2n-gamma)64Ge at a beam energy of 165 MeV. The production cross section for 64Ge was measured to be 640 +/- 70-mu-b, which represents only approximately 0.1% of the total fusion cross section. The Daresbury recoil separator was operated in conjunction with a large gamma-array to study recoil-gamma-gamma-correlations and measure recoil-gamma angular distributions. A level scheme for 64Ge was constructed containing 19 levels. The nucleus appears to have a structure consistent with a gamma-soft shape. Shape changes induced by aligned g9/2 nucleons are discussed. An overview of octupole correlations in the A congruent-to 60-80 mass region is given. Evidence for forbidden E1 transitions was found which is indicative of considerable isospin mixing.