Experimental Study of the ${}^{\text{38}}$S Excited Level Scheme

Abstract

Information on the ${}^{38}$S level scheme was expanded through experimental work utilizing a fusion-evaporation reaction and in-beam $\gamma$-ray spectroscopy. Prompt $\gamma$-ray transitions were detected by the Gamma-Ray Energy Tracking Array (GRETINA) and recoiling ${}^{38}$S residues were selected by the Fragment Mass Analayzer (FMA). Tools based on machine-learning techniques were developed and deployed for the first time in order to enhance the unique selection of ${}^{38}$S residues and identify any associated $\gamma$-ray transitions. The new level information, including the extension of the even-spin yrast sequence through $J^{\pi }=8^{(+)}$, 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 ${}^{36}$Si-${}^{38}$S in particular, was also presented with an emphasis on the role and influence of the neutron $1p_{3/2}$ orbital on the structure in the region.

References in corpus (8)

• Machine Learning in Nuclear Physics
• Shape transitions in exotic Si and S isotopes and tensor-force-driven Jahn-Teller effect
• A new effective interaction for $0\hslash \omega$ shell model calculations in the sdpf valence space
• The Neutron-Rich Edge of the Nuclear Landscape. Experiment and Theory
• Evolution of the N=20 and 28 Shell Gaps and 2-particle-2-hole states in the FSU Interaction
• Probing shell structure and shape changes in neutron-rich sulfur isotopes through transient-field g factor measurements on fast radioactive beams of 38S and 40S
• Structure of ${}^{38}$Cl and the quest for a comprehensive shell model interaction
• Shell structure underlying the evolution of quadrupole collectivity in S-38 and S-40 probed by transient-field g-factor measurements on fast radioactive beams