Relativistic Impulse Approximation, Nuclear Currents, and the Spin-Difference Function

Abstract

Traditional nonrelativistic impulse-approximation treatments of $p$-nucleus scattering using a local nucleon-nucleon $t$ matrix neglect nuclear currents which are intrinsic to relativistic approaches also employing a local $t$ matrix. Inclusion of these current terms is essential to the understanding of the spin-difference function, $({D}_{\mathrm{qk}}+{D}_{\mathrm{kq}})+i(P\ensuremath{-}Ay)$, as shown by comparison with $^{12}\mathrm{C}(p, {p}^{\ensuremath{'}})^{12}\mathrm{C}^{*}(12.71 \mathrm{MeV}, {1}^{+}, T=0)$ spin-difference data at 150 MeV.