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

Author:

C. R. Hoffman, R. S. Lubna, E. Rubino, S. L. Tabor, K. Auranen, P. C. Bender, C. M. Campbell, M. P. Carpenter, J. Chen, M. Gott, J. P. Greene, D. E. M. Hoff, T. Huang, H. Iwasaki, F. G. Kondev, T. Lauritsen, B. Longfellow, C. Santamaria, D. Seweryniak, T. L. Tang, G. L. Wilson, J. Wu, S. Zhu

Keyword:

Nuclear Experiment, Nuclear Experiment (nucl-ex)

journal:

date:

2023-05-25 16:00:00

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.

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