Angular correlation, spin alignment, and systematics of mis-matched 12C+12C inelastic scattering resonances

Particle gamma-ray angular correlation measurements have been used to study the spin alignment and magnetic-substate population parameters for the 2+1 (4.443 MeV) state in 12C, populated in the 12C(12C,12C[0+2])12C(2+1) inelastic scattering reaction in the vicinity of a prominent, narrow peak in the scattering excitation function. The data show a strong alignment of the spin with the orbital angular momentum, and suggest that the cross section peak corresponds to a spin 14+ resonance at Ec.m.=28.0 MeV. This energy is close to that where a strong peak is also observed in the 0+1+0+2 excitation function. A comparison between the data for these two channels lends some support to recent theoretical calculations of resonance behavior for angular-momentum-mismatched channels in 12C+12C inelastic scattering