Spin-flip probability in heavy-ion inelastic scattering☆

Abstract The spin-flip probability S (θ) was observed in the reactions 12 C( 13 C, 13 C′) 12 C(2 + 1 ) and 12 C( 15 N, 15 N′) 12 C(2 + 1 ) at E( 13 C ) = 87 and E( 15 N ) = 94 MeV , respectively, by particle-gamma angular correlations, in which gamma rays emitted both in-plane and out-of-plane were detected. Distorted-wave Born-approximation (DWBA) calculations required a strength of 2–3 MeV for the spin-orbit interaction to reproduce the observed S (θ), which is significantly larger than that given by the folding-model description.