A complete set of polarization transfer observables has been measured for the $^{ 12}{ \rm C}(p,n)$ reaction at $T_p=296 { \rm MeV}$ and $\theta_{ \rm lab}=0^{ \circ}$. The total spin transfer $\Sigma(0^{ \circ})$ and the observable $f_1$ deduced from the measured polarization transfer observables indicate that the spin--dipole resonance at $E_x \simeq 7 { \rm MeV}$ 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 $Q \simeq 3.6 { \rm fm}^{ -1}$ is discussed.
Categories: nucl-ex