High-spin spectroscopy of Ga-63(31)32 and Ga-65(31)34

High-spin states in the nuclei Ga-63 and Ga-65 were studied following the r eaction S-32 + Ca-40 at a reaction energy of 125 MeV and using the GASP gam ma -ray spectrometer in combination with the ISIS charged-particle detector system. In addition to low-lying negative-parity states with single-partic le character, rotational-like cascades built on the 9/2(+) and 19/2(-) stat es have been observed in both nuclei. Sidebands with negative parity in Ga- 63 and positive parity in Ga-65 could be established. The experimental resu lts are compared with Total Routhian Surface calculations which describe th e nuclei as moderately deformed (beta (2) approximate to 0.25) and gamma so ft at low rotational frequencies. The highest experimentally observed posit ive-parity state in Ga-65 (41/2(+)) is in good agreement with the calculate d crossing of the collective band with a non-collective one terminating at this spin.