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We report measurements of the cross section and a complete set ofpolarization observables for the Gamow--Teller ${}^{12}{\rmC}(\vec{p},\vec{n}){}^{12}{\rm N}({\rm g.s.},1^+)$ reaction at a bombardingenergy of 296 MeV.  The data are compared with distorted wave impulse approximation calculationsemploying transition form factors normalized to reproduce the observedbeta-decay $ft$ value.  The cross section is significantly under-predicted by the calculations atmomentum transfers $q \gtrsim $ 0.5 ${\rm fm^{-1}}$.  The discrepancy is partly resolved by considering the non-locality of thenuclear mean field. However, the calculations still under-predict the crosssection at large momentum transfers of $q$ $\simeq$ 1.6 ${\rm fm^{-1}}$.  We also performed calculations employing random phase approximation responsefunctions and found that the observed enhancement can be attributed in part topionic correlations in nuclei.

Study of nuclear correlation effects via 12C(p,n)12N(g.s.,1+) at 296 MeV