Inelastic scattering of polarized protons to unnatural parity states in 40Ca and 28Si

Cross sections and analyzing powers leading to unnatural parity states of 2-, T = 0 (6.025 and 6.75 MeV), 2-, T = 1 (8.42 MeV) in 40Ca and 6-, T = 0 (11.58 MeV) and 6-, T = 1 (14,36 MeV) in 28Si were measured at 65 MeV. These states are pair states of different isospin with same spin-parity. The analyzing powers for a pair of T = 0 and T = 1 excitations in 40Ca show an isospin dependence and those in 28Si do not show. The measured angular distributions were compared with microscopic DWBA calculations using two sets of the effective nucleon-nucleon interaction. In the case when the tensor interaction is essential in reproducing the cross section data, good agreements between the calculations and the data for the analyzing powers are obtained. The trends are common to the calculations using two sets of the interaction. (author)