Shell structure of 43S and collapse of the N = 28 shell closure

Momiyama, S.; Wimmer, K.; Bazin, D.; Belarge, J.; Bender, P.; Elman, B.; Gade, A.; Kemper, K. W.; Kitamura, N.; Longfellow, B.; Lunderberg, E.; Niikura, M.; Ota, S.; Schrock, P.; Tostevin, J. A.; Weisshaar, D.

doi:10.1103/physrevc.102.034325

Shell structure of ⁴³S and collapse of the N = 28 shell closure

Journal Article · Fri Sep 25 00:00:00 EDT 2020 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.102.034325· OSTI ID:1669897

Momiyama, S. ^[1]; ^[2]; Bazin, D. ^[3]; Belarge, J. ^[3]; Bender, P. ^[3]; Elman, B. ^[3]; ^[3]; ^[4]; Kitamura, N. ^[5]; Longfellow, B. ^[3]; Lunderberg, E. ^[3]; ^[6]; Ota, S. ^[5]; Schrock, P. ^[5]; Tostevin, J. A. ^[7]; ^[3]

The University of Tokyo (Japan); Michigan State University
The University of Tokyo (Japan); Instituto de Estructura de la Materia, Madrid (Spain)
Michigan State University, East Lansing, MI (United States)
Florida State University, Tallahassee, FL (United States)
University of Tokyo, Saitama (Japan)
The University of Tokyo (Japan)
University of Surrey (United Kingdom)

The single-particle structure of the N = 27 isotones provides insights into the shell evolution of neutron-rich nuclei from the doubly-magic ⁴⁸Ca toward the drip line. ⁴³S was studied employing the one-neutron knockout reaction from a radioactive ⁴⁴S beam. Using a combination of prompt and delayed γ-ray spectroscopy the level structure of ⁴³S was clarified. Momentum distributions were analyzed and allowed for spin and parity assignments. The deduced spectroscopic factors show that the ⁴⁴S ground-state configuration has a strong intruder component. Here, the results were confronted with shell model calculations using two effective interactions. General agreement was found between the calculations, but strong population of states originating from the removal of neutrons from the 2p_3/2 orbital in the experiment indicates that the breakdown of the N = 28 magic number is more rapid than the theoretical calculations suggest.

View Accepted Manuscript (DOE)

Research Organization:: Michigan State University, East Lansing, MI (United States)

Sponsoring Organization:: National Science Foundation; Science and Technology Facilities Council; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-05CH11231; SC0014537; SC0020451

OSTI ID:: 1669897

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 3 Vol. 102; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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