Neutron Transfer Reactions for Deformed Nuclei Using Sturmian Basis

Abstract

We study the spin-parity distribution P(J${}^{\pi }$,E) of ${}^{156}$Gd excited states above the neutron separation energy that are expected to be populated via the neutron pickup reaction ${}^{157}$Gd(${}^3$He,${}^4$He)${}^{156}$Gd. In general, modeling of the spin-parity distribution is important for the applicability of the surrogate reaction technique as a method of deducing reaction cross sections. We model excited states in ${}^{156}$Gd as rotational states built on intrinsic states consisting of a hole in the core where the hole represents neutron removal form a deformed single particle state. The reaction cross section to each excited state is calculated using standard reaction code that uses spherical reaction form-factor input. The spectroscopic factor associated with each form-factor is the expansion coefficient of the deformed neutron state in a spherical Sturmian basis consisting of the spherical reaction form-factors.

12 pages (two columns), 13 figures (16 graphs), 3 tables, revtex4, bibTeX, pdfTeX