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27 April 2024

» arxiv » 1508.1757

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Shell evolution approaching the N=20 island of inversion: structure of 26Na
G.L. Wilson ; W.N. Catford ; N.A. Orr ; C.Aa. Diget ; A. Matta ; G. Hackman ; S.J. Williams ; I.C. Celik ; N.L. Achouri ; H. Al Falou ; R. Ashley ; R.A.E. Austin ; G.C. Ball ; J.C. Blackmon ; A.J. Boston ; H.C. Boston ; S.M. Brown ; D.S. Cross ; M. Djongolov ; T.E. Drake ; U. Hager ; S.P. Fox ; B.R. Fulton ; N. Galinski ; A.B. Garnsworthy ; D. Jamieson ; R. Kanungo ; K. Leach ; J.N. Orce ; C.J. Pearson ; M. Porter-Peden ; F. Sarazin ; E.C. Simpson ; S. Sjue ; D. Smalley ; C. Sumithrarachchi ; S. Triambak ; C. Unsworth ; R. Wadsworth ;
Date:	7 Aug 2015
Abstract:	The levels in 26Na with single particle character have been observed for the first time using the d(25Na,p gamma) reaction at 5 MeV/nucleon. The measured excitation energies and the deduced spectroscopic factors are in good overall agreement with (0+1) hbar-omega 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 occuring in the neighbouring Z=10 and 12 nuclei -- 25,27Ne and 27,29Mg -- is seen to extend to Z=11. Together with the newly measured splitting of the spin multiplets formed by odd-odd proton-neutron coupling, this provides further, stronger constraints on the modelling of the transition into the island of inversion.
Source:	arXiv, 1508.1757
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