Unbound states in $^{19}$O(d,p$\gamma$)$^{20}$O: tracing the $\nu$(d$_{3/2}$) orbital

TL;DR

This study investigates unbound states in $^{20}$O using a neutron transfer reaction, providing new insights into the nuclear structure and orbital configurations near the neutron separation energy.

Contribution

It reports the first observation of several unbound states in $^{20}$O through the $^{19}$O(d,p) reaction with particle-$eta$ spectroscopy, enhancing understanding of the $ u$(d$_{3/2}$) orbital.

Findings

Identification of unbound states between 7.6 and 9.8 MeV.

Improved angular distributions for bound states.

First-time access to certain unbound states via this reaction channel.

Abstract

The single-neutron transfer reaction $^{19}$O(d,p$\gamma$)$^{20}$O has been performed at GANIL, populating states up to and above the neutron separation energy. Bound states populated by s-wave and d-wave transfer have been observed with improved experimental angular distributions. Critically, several unbound states between 7.6 MeV and 9.8 MeV have been accessed for the first time through the 19O(d,p) channel, and isolated via particle-$\gamma$ spectroscopy.