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Neutron single-particle strength in silicon isotopes: Constraining the driving forces of shell evolution

Stroberg, SR, Gade, A, Tostevin, JA, Bader, VM, Baugher, T, Bazin, D, Berryman, JR, Brown, BA, Campbell, CM, Kemper KW, , Langer C, , Lunderberg E, , Lemasson, A, Noji, S, Otsuka, T, Reccia, F, Walz, C, Weisshaar, D and Williams, S (2015) Neutron single-particle strength in silicon isotopes: Constraining the driving forces of shell evolution Physical Review C: Nuclear Physics, 91 (4), 041302.

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Abstract

Shell evolution is studied in the neutron-rich silicon isotopes Si36,38,40 using neutron single-particle strengths deduced from one-neutron knockout reactions. Configurations involving neutron excitations across the N=20 and N=28 shell gaps are quantified experimentally in these rare isotopes. Comparisons with shell model calculations show that the tensor force, understood to drive the collective behavior in Si42 with N=28, is already important in determining the structure of Si40 with N=26. New data relating to cross-shell excitations provide the first quantitative support for repulsive contributions to the cross-shell T=1 interaction arising from three-nucleon forces.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Stroberg, SRUNSPECIFIEDUNSPECIFIED
Gade, AUNSPECIFIEDUNSPECIFIED
Tostevin, JAUNSPECIFIEDUNSPECIFIED
Bader, VMUNSPECIFIEDUNSPECIFIED
Baugher, TUNSPECIFIEDUNSPECIFIED
Bazin, DUNSPECIFIEDUNSPECIFIED
Berryman, JRUNSPECIFIEDUNSPECIFIED
Brown, BAUNSPECIFIEDUNSPECIFIED
Campbell, CMUNSPECIFIEDUNSPECIFIED
Kemper KW, UNSPECIFIEDUNSPECIFIED
Langer C, UNSPECIFIEDUNSPECIFIED
Lunderberg E, UNSPECIFIEDUNSPECIFIED
Lemasson, AUNSPECIFIEDUNSPECIFIED
Noji, SUNSPECIFIEDUNSPECIFIED
Otsuka, TUNSPECIFIEDUNSPECIFIED
Reccia, FUNSPECIFIEDUNSPECIFIED
Walz, CUNSPECIFIEDUNSPECIFIED
Weisshaar, DUNSPECIFIEDUNSPECIFIED
Williams, SUNSPECIFIEDUNSPECIFIED
Date : 15 April 2015
Identification Number : 10.1103/PhysRevC.91.041302
Related URLs :
Additional Information : Copyright 2015 The American Physical Society.
Depositing User : Symplectic Elements
Date Deposited : 22 May 2015 08:12
Last Modified : 22 May 2015 13:33
URI: http://epubs.surrey.ac.uk/id/eprint/807486

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