학술논문
Shell evolution approaching the N=20 island of inversion: Structure of 26Na
Document Type
article
Author
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.G. 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
Source
Physics Letters B, Vol 759, Iss C, Pp 417-423 (2016)
Subject
Language
English
ISSN
0370-2693
1873-2445
84042850
1873-2445
84042850
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.