Studies of the (p,n) reaction at medium energies

Abstract

We measured differential cross sections, analyzing powers, and the polarization-transfer coefficient [Formula: see text] for 135 MeV (p,n) reactions on 40Ca and 48Ca. The observed shapes for the analyzing-power angular distributions are in good overall agreement with distorted-wave-impulse-approximation calculations, and are more sensitive to nuclear structure than to whether or not spin transfer is involved. Measured spin-flip probabilities for [Formula: see text] combined with a multipole analysis of differential cross sections reveal that at 0°, the apparent continuum under and adjacent to the Gamow–Teller giant resonance is also primarily 1+ strength. A comparison of [Formula: see text] and [Formula: see text] shows no discernable signature of Gamow–Teller strength in the region –30 < Q(MeV) < –45. Utilizing information from high-resolution cross-section measurements and spin-flip probabilities, we decompose the spin-dipole resonance of 40Sc into its 0−, 1−, and 2− components.