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Journal Articles Physical Review C Year : 2015

Spectroscopy of $^{28}$Na: shell evolution toward the drip line

K. Wimmer
V. Bader
  • Function : Author
C. Bancroft
  • Function : Author
D. Barofsky
  • Function : Author
B. Bastin
T. Baugher
  • Function : Author
Dominique Bazin
  • Function : Author
V. Bildstein
  • Function : Author
C. Borcea
  • Function : Author
R. Borcea
  • Function : Author
B.A. Brown
  • Function : Author
A. Gade
L. Gaudefroy
  • Function : Author
H. Iwasaki
  • Function : Author
T. Kröll
  • Function : Author
C. Langer
  • Function : Author
O. Llidoo
  • Function : Author
J. Lloyd
  • Function : Author
F. Negoita
  • Function : Author
G. Perdikakis
  • Function : Author
F. Recchia
  • Function : Author
T. Redpath
  • Function : Author
T. Roger
F. Rotaru
  • Function : Author
S. Saenz
  • Function : Author
D. Smalley
  • Function : Author
D. Sohler
M. Stanoiu
  • Function : Author
S.R. Stroberg
  • Function : Author
D. Weisshaar
A. Westerberg
  • Function : Author

Abstract

Excited states in $^{28}$Na have been studied using the $\beta$-decay of implanted $^{28}$Ne ions at GANIL/LISE as well as the in-beam $\gamma$-ray spectroscopy at the NSCL/S800 facility. New states of positive (J$^{\pi}$=3,4$^+$) and negative (J$^{\pi}$=1-5$^-$) parity are proposed. The former arise from the coupling between 0d$_{5/2}$ protons and a 0d$_{3/2}$ neutron, while the latter are due to couplings with 1p$_{3/2}$ or 0f$_{7/2}$ neutrons. While the relative energies between the J$^{\pi}$=1-4$^+$ states are well reproduced with the USDA interaction in the N=17 isotones, a progressive shift in the ground state binding energy (by about 500 keV) is observed between $^{26}$F and $^{30}$Al. This points to a possible change in the proton-neutron 0d$_{5/2}$-0d$_{3/2}$ effective interaction when moving from stability to the drip line. The presence of J$^{\pi}$=1-4$^-$ negative parity states around 1.5 MeV as well as of a candidate for a J$^{\pi}$=5$^-$ state around 2.5 MeV give further support to the collapse of the N=20 gap and to the inversion between the 0f$_{7/2}$ and 1p$_{3/2}$ levels below Z=12. These features are discussed in the framework of Shell Model and EDF calculations, leading to predicted negative parity states in the low energy spectra of the $^{26}$F and $^{25}$O nuclei.

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Dates and versions

in2p3-01136493 , version 1 (27-03-2015)

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A. Lepailleur, K. Wimmer, A. Mutschler, O. Sorlin, V. Bader, et al.. Spectroscopy of $^{28}$Na: shell evolution toward the drip line. Physical Review C, 2015, 92 (5), pp.054309. ⟨10.1103/PhysRevC.92.054309⟩. ⟨in2p3-01136493⟩
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