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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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Abstract

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 :
NameEmailORCID
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.AJ.Tostevin@surrey.ac.uk
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
URI: http://epubs.surrey.ac.uk/id/eprint/858326

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