Complete Set of Polarization Transfer Observables for the ${}^{12}\mathrm{C}(p,n)$ Reaction at 296 MeV and 0${}^{\circ }$

Abstract

A complete set of polarization transfer observables has been measured for the ${}^{12}\mathrm{C}(p,n)$ reaction at $T_p=296\mathrm{MeV}$ and $\hat{I}{¸}_{\mathrm{lab}}=0^{\circ }$. The total spin transfer $\hat{I}\pounds (0^{\circ })$ and the observable $f_1$ deduced from the measured polarization transfer observables indicate that the spin--dipole resonance at $E_x\simeq 7\mathrm{MeV}$ has greater $2^{-}$ strength than $1^{-}$ strength, which is consistent with recent experimental and theoretical studies. The results also indicate a predominance of the spin-flip and unnatural-parity transition strength in the continuum. The exchange tensor interaction at a large momentum transfer of $Q\simeq 3.6{\mathrm{fm}}^{-1}$ is discussed.

4 pages, 4 figures