Gross structure in reactions of deformed nuclei

Abstract

The Nilsson model is applied to determine the effect of nuclear deformation on gross structure in direct reaction spectra among intermediate nuclei. While the gross structure known for spherical nuclei is obscured to low resolution observations, it is replaced by an equally distinctive pattern whose major features are fixed relative to single nucleon levels in the undeformed well. Definite minima in the spectrum persist at magic number gaps even for fairly large deformations. Location of the gross structure pattern on a nuclear excitation scale is determined by deformation and nucleon population numbers, so that shifts of the structure among spectra of neighbouring nuclei are definite and predictable. The angular distribution in each part of the spectrum should be dominated by a few specific l min values even though the single particle l is not a quantum number and parities are mixed. The effects are illustrated numerically with respect to the (n, p) reaction on target isotopes of Rh, In and Sb.