Y. Sugiyama et al., NEW APPROACH TO SPIN ASSIGNMENTS OF INTERMEDIATE STRUCTURES IN C-12(O-16,C-12[2(1)-16(])O), Physical review. C. Nuclear physics, 49(6), 1994, pp. 3305-3308
Magnetic substate populations for the 2+ state at 4.44 MeV in C-12 wer
e measured in resonant C-12 + O-16 inelastic scattering by the gamma-r
ay recoil method. The m-substate population has been determined in the
coordinate frame where a quantization axis is taken along the center
of mass scattering angle of a reaction product. This coordinate frame
gives an advantage that a resonance spin J can be obtained directly fr
om m-substate angular distributions compared with the beam-axis frame.
In addition a decay L value is sensitive to the relative intensity be
tween each m-substate cross section. Our data suggest a spin assignmen
t of J(pi) = 16+ or 17- for the structures at E(c.m.) = 29.8 MeV and 3
1.8 MeV. Both structures are determined to decay dominantly through th
e aligned configuration of L = J - 2.