IDENTIFICATION OF T=0 AND T=1 BANDS IN THE N=Z=37 NUCLEUS RB-74

The gamma decay of excited states in the N = Z odd-odd nucleus Rb-74 h as been observed for the first time. The reaction Ca-40(Ca-40,alpha pn )Rb-74 at 128 MeV beam energy was used. The ground state rotational ba nd can be interpreted as being formed from the T = 1 isobaric analog s tates of Kr-74 with pairing correlations based on T = 1, M(T) = 0 neut ron-proton pairs. At higher rotational frequency, a T = 0 rotational b and becomes energetically favored over the T = 1 ground state band, in agreement with the predictions of cranked shell model calculations wh ich explicitly include T = 0 and T = 1 pairs.