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The Structure of ³³Si and the magicity of the N=20 gap at Z=14

Jongile, S., Lemasson, A., Sorlin, O., Wiedeking, M., Papka, P., Bazin, D., Borcea, C., Borcea, R., Gade, A., Iwasaki, H. , Khan, E., Lepailleur, A., Mutschler, A., Nowacki, F., Recchia, F., Roger, T., Rotaru, F., Stanoiu, M., Stroberg, S.R, Tostevin, J.A, Vanderbrouck, M., Weisshaar, D. and Wimmer, K. (2020) The Structure of ³³Si and the magicity of the N=20 gap at Z=14 Physical Review C, 102 (2), 024321.

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The structure of ³³Si was studied by a one-neutron knockout reaction from a ³⁴Si beam at 98.5 MeV/u incident on a 9 Be target. The prompt γ rays following the de-excitation of ³³Si were detected using the GRETINA γ -ray tracking array while the reaction residues were identified on an event-by-event basis in the focal plane of the S800 spectrometer at the National Superconducting Cyclotron Laboratory. The presently derived spectroscopic factor values, C 2 S , for the 3 / 2 + and 1 / 2 + states, corresponding to a neutron removal from the 0 d 3 / 2 and 1 s 1 / 2 orbitals, agree with shell model calculations and point to a strong N = 20 shell closure. Three states arising from the more bound 0 d 5 / 2 orbital are proposed, one of which is unbound by about 930 keV. The sensitivity of this experiment has also confirmed a weak population of 9 / 2 and 11 / 2 1 , 2 final states, which originate from a higher-order process. This mechanism may also have populated, to some fraction, the 3 / 2 and 7 / 2 negative-parity states, which hinders a determination of the C 2 S values for knockout from the normally unoccupied 1 p 3 / 2 and 0 f 7 / 2 orbits.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Jongile, S.
Lemasson, A.
Sorlin, O.
Wiedeking, M.
Papka, P.
Bazin, D.
Borcea, C.
Borcea, R.
Gade, A.
Iwasaki, H.
Khan, E.
Lepailleur, A.
Mutschler, A.
Nowacki, F.
Recchia, F.
Roger, T.
Rotaru, F.
Stanoiu, M.
Stroberg, S.R
Vanderbrouck, M.
Weisshaar, D.
Wimmer, K.
Date : 18 August 2020
Funders : Science and Technology Facility Council (STFC)
DOI : 10.1103/PhysRevC.102.024321
Copyright Disclaimer : © 2020 American Physical Society
Additional Information : 0 month embargo. No further action.
Depositing User : James Marshall
Date Deposited : 30 Jul 2020 11:00
Last Modified : 20 Aug 2020 09:45

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