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Neutron Shell Breaking in Neutron-Rich Neon Isotopes

Brown, Simon Mark (2010) Neutron Shell Breaking in Neutron-Rich Neon Isotopes Doctoral thesis, University of Surrey.

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Abstract

The breaking of the N=20 shell gap in neutron-rich nuclei is investigated by studying the single-particle structure of 27Ne via neutron transfer onto a 26Ne beam. The observation of low-lying negative parity states in 27Ne above the 3/2+ ground state is further evidence of the raising of the νd3/2 orbital that is seen in other neutron-rich nuclei in the N=20 region. The previously unseen 7/2− state has been identified as unbound by 331 keV and lies above the already known 3/2− level. The measurements of the present work contradict SDPF-M Monte-Carlo Shell Model predictions, but are in good agreement with WBP shell model calculations in which the single-particle energies of the pf shell are artificially lowered by 1 MeV. This modification was made to mimic the closing of the N = 20 shell gap in neutron-rich nuclei. The predictions of the modifiedWBP calculations are also in agreement with experimental measurements in the adjacent nuclei of 25Ne and 29Mg. The calculations show that core-excited configurations play a significant role in both the 3/2+ ground state and the 7/2− intruder state in 27Ne.

Item Type: Thesis (Doctoral)
Additional Information: Copyright remains with the author.
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Simon Brown
Date Deposited: 07 Apr 2011 12:50
Last Modified: 23 Sep 2013 18:40
URI: http://epubs.surrey.ac.uk/id/eprint/2829

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