Polarization Transfer in the ~(16)O(p,p') Reaction at Forward Angles and Structure of the Spin-dipole Resonances

摘要

Cross sections and polarization transfer observables in the ~(16)O(p,p') reactions at 392 MeV were measured at forward angles including 0° The non-spin-flip (ΔS = 0) and spin-flip (ΔS = 1) strengths in transitions to several discrete states and broad resonances in ~(16)O were extracted using a model-independent method. The giant resonances in the energy region of E_x = 19-27 MeV were found to be predominantly excited by ΔL = 1 transitions. The strength distribution of spin-dipole transitions with ΔS = 1 and ΔL = 1 were deduced. The obtained distribution was compared with a recent shell model calculation. Experimental results are reasonably explained by distorted-wave impulse-approximation calculations with the shell model wave functions.