The spin-parity Jπ of the spin dipole resonances (SDR) in 12N and 12B are investigated via the measurements of polarization observables, the transverse polarization transfer coefficient DNN for the (p→,n→) reaction at 197 and 295 MeV and the tensor analyzing power Axx for the (d→, 2He) reaction at 270 MeV. The polarization observables, DNN and Axx for the peak at 4.5 MeV are consistent with the DWIA prediction with 2- but those for the peak at 7.5 MeV contradict the predictions with an expected Jπ = 1-. Neither polarization observables could detect any concentration of 0- strength. The usefulness of these spin observables in identifying Jπ is shown.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics