Neutron spectroscopic factors of Ni isotopes from transfer reactions

TL;DR

This study systematically extracted 177 neutron spectroscopic factors for nickel isotopes from transfer reactions and compared them with shell model predictions, finding good agreement for ground states but less accuracy for excited states.

Contribution

It provides a comprehensive set of experimental spectroscopic factors for Ni isotopes and evaluates their consistency with different shell model interactions.

Findings

Ground state spectroscopic factors agree well with GXPF1A model predictions.

Other models tend to overestimate spectroscopic factors by about 30%.

Agreement for excited states is within a factor of two.

Abstract

177 neutron spectroscopic factors for nickel isotopes have been extracted by performing a systematic analysis of the angular distributions measured from (d,p) transfer reactions. A subset of the extracted spectroscopic factors are compared to predictions of large-basis shell models in the full pf model space using the GXPF1A effective interaction, and the (f5/2, p3/2, p1/2, g9/2) model space using the JJ4PNA interaction. For ground states, the predicted spectroscopic factors using the GXPF1A effective interaction in the full pf model space agree very well with the experimental values, while predictions based on several other effective interactions and model spaces are about 30% higher than the experimental values. For low-energy excited states (<3.5 MeV), the agreement between the extracted spectroscopic factors and shell model calculations is not better than a factor of two.