Complete set of polarization transfer observables for the \({}^{16}{\rm O}(\vec{p},\vec{n}){}^{16}{\rm F}\) reaction at 296 MeV and 0 degrees

Abstract

We report measurements of the cross section and a complete set of polarization transfer observables for the \({}^{16}{\rm O}(\vec{p},\vec{n}){}^{16}{\rm F}\) reaction at a bombarding energy of \(T_p\) = 296 MeV and a reaction angle of \(\theta_{\rm lab}\) = \(0^{\circ}\). The data are compared with distorted-wave impulse approximation calculations employing the large configuration-space shell-model (SM) wave functions. The well-known Gamow-Teller and spin-dipole (SD) states at excitation energies of \(E_x\) \(\lesssim\) 8 MeV have been reasonably reproduced by the calculations except for the spin--parity \(J^{\pi}\) = \(2^-\) state at \(E_x\) = 5.86 MeV. The SD resonance at \(E_x\) \(\simeq\) 9.5 MeV appears to have more \(J^{\pi}\) = \(2^-\) strength than \(J^{\pi}\) = \(1^-\) strength, consistent with the calculations. The data show significant strength in the spin-longitudinal polarized cross section \(ID_L(0^{\circ})\) at \(E_x\) \(\simeq\) 15 MeV, which indicates existence of the \(J^{\pi}\) = \(0^-\) SD resonance as predicted in the SM calculations.