Shell evolution approaching the N=20 island of inversion - Research Database, The University of York

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

Research output: Contribution to journal › Article › peer-review

Full text download(s)

1s20S0370269316302489main
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Published copy (DOI)

10.1016/j.physletb.2016.05.093

Author(s)

Department/unit(s)

Publication details

Journal	Physics Letters B
Date	Accepted/In press - 31 May 2016
Date	E-pub ahead of print - 2 Jun 2016
Date	Published (current) - 10 Aug 2016
Volume	759
Number of pages	7
Pages (from-to)	417-423
Early online date	2/06/16
Original language	English

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 1p_3/2 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 1p_3/2 orbital relative to the 0f_7/2 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.

Research areas

81V35, Na, Nuclear structure, Shell migration, Transfer reactions, γ-Ray transitions

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