LEPAILLEUR, A.; WIMMER, K.; MUTSCHLER, A.; SORLIN, O.; BADER, V.; BANCROFT, C.; BAROFSKY, D.; BASTIN, B.; BAUGHER, T.; BAZIN, Dominique; BILDSTEIN, V.; BORCEA, C.; BORCEA, R.; BROWN, B.A.; CACERES, L.; GADE, A.; GAUDEFROY, L.; GRÉVY, S.; GRINYER, G.F.; IWASAKI, H.; KHAN, E.; KRÖLL, T.; LANGER, C.; LEMASSON, A.; LLIDOO, O.; LLOYD, J.; NEGOITA, F.; DE OLIVEIRA SANTOS, Francois; PERDIKAKIS, G.; RECCHIA, F.; REDPATH, T.; ROGER, T.; ROTARU, F.; SAENZ, S.; SAINT-LAURENT, M.G.; SMALLEY, D.; SOHLER, D.; STANOIU, M.; STROBERG, S.R.; THOMAS, J.C.; VANDEBROUCK, M.; WEISSHAAR, D.; WESTERBERG, A.

doi:10.1103/PhysRevC.92.054309

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LEPAILLEUR, A.
Grand Accélérateur National d'Ions Lourds [GANIL]

WIMMER, K.

MUTSCHLER, A.
Institut de Physique Nucléaire d'Orsay [IPNO]

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Physical Review C. 2015-11, vol. 92, n° 5, p. 054309

American Physical Society

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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.< Réduire

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23.20.Lv

21.60.Cs

27.30.+t

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

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