Shell evolution approaching the N=20 island of inversion: Structure of Na-26



Wilson, GL, Catford, WN, Orr, NA, Diget, CA, Matta, A, Hackman, G, Williams, SJ, Celik, IC, Achouri, NL, Al Falou, H
et al (show 29 more authors) (2016) Shell evolution approaching the N=20 island of inversion: Structure of Na-26. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 759. 417 - 423.

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Abstract

The levels in 26Na with single particle character have been observed for the first time using the d(25Na, pγ) reaction at 5 MeV/nucleon. The measured excitation energies and the deduced spectroscopic factors are in good overall agreement with (0+1)hω shell model calculations performed in a complete spsdfp basis and incorporating a reduction in the N=20 gap. Notably, the 1p3/2 neutron configuration was found to play an enhanced role in the structure of the low-lying negative parity states in 26Na, compared to the isotone 28Al. Thus, the lowering of the 1p3/2 orbital relative to the 0f7/2 occurring in the neighbouring Z=10 and 12 nuclei - 25,27Ne and 27,29Mg - is seen also to occur at Z=11 and further strengthens the constraints on the modelling of the transition into the island of inversion.

Item Type: Article
Uncontrolled Keywords: 81V35, Nuclear structure, 26Naγ-Ray transitions, Transfer reactions, Shell migration
Depositing User: Symplectic Admin
Date Deposited: 09 Oct 2018 08:29
Last Modified: 23 Nov 2020 12:14
DOI: 10.1016/j.physletb.2016.05.093
Open Access URL: https://www.sciencedirect.com/science/article/pii/...
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URI: http://livrepository.liverpool.ac.uk/id/eprint/3027284