LEVEL SCHEME OF GA-65

The level scheme of Ga-65 has been studied up to an excitation energy of 7035.3 keV and spin-parity values of (27/2(+)). Gamma-ray singles, gamma gamma-coincidences, angular distributions and Doppler shift atte nuation have been measured in the reaction Cu-63(alpha, 2n gamma) at 3 0 MeV. The spin and parity (J(pi)) assignments for several states belo nging to the previously known bands are confirmed. The mean life and t he parity of the 2814.7 keV state, hitherto unknown, are reported. The J(pi) for the 3733.2 keV state is proposed to be 15/2(+) on the basis of angular distribution data and its decay characteristics to the low er-lying states. Experimental evidence is presented in favour of the 3 733.2 keV state of being a bandhead for a rotation-like Delta I=2 posi tive-parity band with the excited members at 4547.5, 5643.5 and 7035.3 keV. The deduced B(E2) results indicate the presence of appreciable c ollectivity in the other positive-parity band built on the 9/2(+), 203 7.3 keV state. These bands in Ga-65 are discussed and compared with si milar bands in the neighbouring odd-A nucleus Ga-67.