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

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)ħω 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.
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G.L. Wilson, W.N. Catford, N.A. Orr, C.Aa. Diget, A. Matta, et al.. Shell evolution approaching the N=20 island of inversion: Structure of 26Na. Physics Letters B, Elsevier, 2016, 759, pp.417-423. ⟨10.1016/j.physletb.2016.05.093⟩. ⟨in2p3-01326382⟩

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