https://doi.org/10.1140/epja/s10050-024-01399-z
Regular Article – Experimental Physics
Single-neutron adding on 
S
1
Department of Physics, Davidson College, 28035, Davidson, NC, USA
2
Physics Division, Argonne National Laboratory, 60439, Argonne, IL, USA
3
Department of Physics, Florida State University, 32306, Tallahassee, FL, USA
4
Department of Physics & Astronomy, Ursinus College, 19426, Collegeville, PA, USA
Received:
3
July
2024
Accepted:
12
August
2024
Published online:
5
September
2024
Single-neutron adding data was collected in order to determine the distribution of the single-neutron strength of the 
, 
, 
and 
orbitals outside of 
, S. The S(d,p)
S reaction has been measured at 8 MeV/u to investigate cross sections to excited states in S. Outgoing proton yields and momenta were analyzed by the Super-Enge Split-Pole Spectrograph in conjunction with the CeBrA demonstrator located at the John D. Fox Laboratory at Florida State University. Angular distributions were compared with Distorted Wave Born Approximation calculations in order to extract single-neutron spectroscopic overlaps. Spectroscopic overlaps and strengths were determined for states in S up through 6 MeV in excitation energy. Each orbital was observed to have fragmented strength where a single level carried the majority. The single-neutron centroids of the , , and orbitals were determined to be 
keV, 
keV, 
keV, and 
keV, respectively. A previous discrepancy in the literature with respect to the distribution of the neutron strength was resolved. The integration of the normalized spectroscopic strengths, up to 5.1 MeV in excitation energy, revealed fully-vacant occupancies for the , , and orbitals, as expected. The spacing in the single-neutron energies highlighted a reduction in the traditional 
shell-gap, relative to both the 1p spin-orbit energy difference (
) and the lower limit on the 
shell spacing.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
