SPIN-FLIP PROBABILITY VIA THE MG-26(HE-3,T-GAMMA)AL-26 REACTION

The spin-flip probability for the charge-exchange reaction Mg-26(He-3,tgamma)Al-26 (1+; 1.06 MeV) has been measured at E = 53 MeV and theta(lab) = 10-degrees. The extracted value is 0.41 +/- 0.04. A microscopic DWBA calculation with empirically determined effective interactions reproduces the observed cross sections fairly well but the spin-flip probability poorly. To supplement the (He-3,tgamma) study, the spin-flip probability has been measured for the same state by the charge-exchange (p,ngamma) reaction at 35 MeV and theta(lab) = 30-degrees and found to be 0.52 +/- 0.11. Though statistically not significant the lower value of S in the (He-3,t) reaction may reflect on the more complex nature of this reaction at the present bombarding energy