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

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  • W. N. Catford
  • N. A. Orr
  • 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
  • N. Galinski
  • A. B. Garnsworthy
  • D. Jamieson
  • R. Kanungo
  • K. G. Leach
  • J. N. Orce
  • M. Porter-Peden
  • F. Sarazin
  • S. Sjue
  • D. Smalley
  • C. Sumithrarachchi
  • S. Triambak
  • C. Unsworth


Publication details

JournalPhysics Letters B
DateAccepted/In press - 31 May 2016
DateE-pub ahead of print - 2 Jun 2016
DatePublished (current) - 10 Aug 2016
Number of pages7
Pages (from-to)417-423
Early online date2/06/16
Original languageEnglish


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.

    Research areas

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


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