Physics Letters B (Aug 2016)
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.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
Affiliations
- G.L. Wilson
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, UK
- W.N. Catford
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, UK
- N.A. Orr
- LPC, ENSICAEN, CNRS/IN2P3, UNICAEN, Normandie Université, 14050 Caen Cedex, France
- C.Aa. Diget
- Department of Physics, University of York, York, YO10 5DD, UK
- A. Matta
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, UK
- G. Hackman
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
- S.J. Williams
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
- I.C. Celik
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, UK
- N.L. Achouri
- LPC, ENSICAEN, CNRS/IN2P3, UNICAEN, Normandie Université, 14050 Caen Cedex, France
- H. Al Falou
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
- R. Ashley
- Department of Physics, University of Liverpool, Liverpool, L69 3BX, UK
- R.A.E. Austin
- Department of Physics, St Mary's University, Halifax, NS, B3H 3C3, Canada
- G.C. Ball
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
- J.C. Blackmon
- Department of Physics, Louisiana State University, Baton Rouge, LA 70803, USA
- A.J. Boston
- Department of Physics, University of Liverpool, Liverpool, L69 3BX, UK
- H.C. Boston
- Department of Physics, University of Liverpool, Liverpool, L69 3BX, UK
- S.M. Brown
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, UK
- D.S. Cross
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
- M. Djongolov
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
- T.E. Drake
- Department of Physics, University of Toronto, Toronto, Ontario, M5S 1A7, Canada
- U. Hager
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
- S.P. Fox
- Department of Physics, University of York, York, YO10 5DD, UK
- B.R. Fulton
- Department of Physics, University of York, York, YO10 5DD, UK
- N. Galinski
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
- A.B. Garnsworthy
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
- D. Jamieson
- Department of Physics, University of Guelph, Guelph, ON, N1G 2W1, Canada
- R. Kanungo
- Department of Physics, St Mary's University, Halifax, NS, B3H 3C3, Canada
- K.G. Leach
- Department of Physics, University of Guelph, Guelph, ON, N1G 2W1, Canada
- J.N. Orce
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
- C.J. Pearson
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
- M. Porter-Peden
- Department of Physics, Colorado School of Mines, Golden, CO 80401, USA
- F. Sarazin
- Department of Physics, Colorado School of Mines, Golden, CO 80401, USA
- E.C. Simpson
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, UK
- S. Sjue
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
- D. Smalley
- Department of Physics, Colorado School of Mines, Golden, CO 80401, USA
- C. Sumithrarachchi
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
- S. Triambak
- TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
- C. Unsworth
- Department of Physics, University of Liverpool, Liverpool, L69 3BX, UK
- R. Wadsworth
- Department of Physics, University of York, York, YO10 5DD, UK
- DOI
- https://doi.org/10.1016/j.physletb.2016.05.093
- Journal volume & issue
-
Vol. 759,
no. C
pp. 417 – 423
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.
Keywords
