P-A in the 48Ca(p,n)48Sc reaction at 135 MeV.

Abstract

The polarization (P) and the analyzing power (A) were measured for the $^{48}\mathrm{Ca}$(p,n${)}^{48}$Sc reaction at 135 MeV. Of special interest is the difference (P-A) in these two quantities for the transitions to the two ${1}^{+}$ states at 2.52 and 16.8 MeV. Because of the difference in the predominant one-particle--one-hole configurations for these two states, viz., (${\mathit{f}}_{7/2}$,${\mathit{f}}_{7/2}^{\mathrm{\ensuremath{-}}1}$) and (${\mathit{f}}_{5/2}$,${\mathit{f}}_{7/2}^{\mathrm{\ensuremath{-}}1}$), respectively, qualitative differences in P-A are predicted based on nonlocal exchange contributions. The experimental results agree qualitatively with these predicted differences, but there are significant quantitative differences indicating that other effects contribute as well.