Neutron Transfer Reactions for Deformed Nuclei Using Sturmian Basis
Abstract
We study the spin-parity distribution P(Jπ,E) of 156Gd excited states above the neutron separation energy that are expected to be populated via the neutron pickup reaction 157Gd(3He,4He)156Gd. 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 156Gd 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.