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Is the structure of 42Si understood?

Gade, A., Brown, B.A., Tostevin, J. A., Bazin, D., Bender, P. C., Campbell, C.M., Crawford, H. L., Elman, B., Kemper, K. W., Longfellow, B. , Lunderberg, E., Rhodes, D. and Weisshaar, D. (2019) Is the structure of 42Si understood? Physical Review Letters, 122 (22), 222501. 222501-1 - 222501-6.

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A more detailed test of the implementation of nuclear forces that drive shell evolution in the pivotal nucleus 42Si – going beyond earlier comparisons of excited-state energies – is important. The two leading shell-model effective interactions, SDPF-MU and SDPF-U-Si, both of which reproduce the low-lying 42Si(2+ 1) energy, but whose predictions for other observables differ significantly, are interrogated by the population of states in neutron-rich 42Si with a one-proton removal reaction from 43P projectiles at 81 MeV/nucleon. The measured cross sections to the individual 42Si final states are compared to calculations that combine eikonal reaction dynamics with these shell-model nuclear structure overlaps. The differences in the two shell-model descriptions are examined and linked to predicted low-lying excited 0+ states and shape coexistence. Based on the present data, which are in better agreement with the SDPF-MU calculations, the state observed at 2150(13) keV in 42Si is proposed to be the (0+ 2) level.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Gade, A.
Brown, B.A.
Tostevin, J.
Bazin, D.
Bender, P. C.
Campbell, C.M.
Crawford, H. L.
Elman, B.
Kemper, K. W.
Longfellow, B.
Lunderberg, E.
Rhodes, D.
Weisshaar, D.
Date : 7 June 2019
Funders : Science and Technology Facilities Council (STFC)
DOI : 10.1103/PhysRevLett.122.222501
Copyright Disclaimer : © 2019 American Physical Society
Related URLs :
Depositing User : Clive Harris
Date Deposited : 20 May 2019 13:14
Last Modified : 11 Jun 2019 08:01

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