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Shell structure of S43 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. and Weisshaar, D. (2020) Shell structure of S43 and collapse of the N=28 shell closure Physical Review C, 102 (3).

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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. 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 2p3/2 orbital in the experiment indicates that the breakdown of the N = 28 magic number is more rapid than the theoretical calculations suggest.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
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.
Weisshaar, D.
Date : 25 September 2020
Funders : Science and Technology Facilities Council (STFC)
DOI : 10.1103/PhysRevC.102.034325
Copyright Disclaimer : ©2020 American Physical Society
Depositing User : Diane Maxfield
Date Deposited : 01 Oct 2020 12:21
Last Modified : 01 Oct 2020 12:21

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