Experimental study of the S38 excited level scheme

Information on the $^{38}\mathrm{S}$ level scheme was expanded through experimental work utilizing a fusion-evaporation reaction and in-beam $\ensuremath{\gamma}$-ray spectroscopy. Prompt $\ensuremath{\gamma}$-ray transitions were detected by the Gamma-Ray Energy Tracking Array (GRETINA) and recoiling $^{38}\mathrm{S}$ residues were selected by the Fragment Mass Analyzer (FMA). Tools based on machine-learning techniques were developed and deployed for the first time in order to enhance the unique selection of $^{38}\mathrm{S}$ residues and identify any associated $\ensuremath{\gamma}$-ray transitions. The new level information, including the extension of the even-spin yrast sequence through ${J}^{\ensuremath{\pi}}={8}^{(+)}$, was interpreted in terms of a basic single-particle picture as well shell-model calculations which incorporated the empirically derived FSU interaction. A comparison between the properties of the yrast states in the even-$Z, N=22$ isotones from $Z=14$ to 20, and for $^{36}\mathrm{Si}--^{38}\mathrm{S}$ in particular, was also presented with an emphasis on the role and influence of the neutron $1{p}_{3/2}$ orbital on the structure in the region.