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[en] We have studied the resonant elastic scattering reaction ¹⁸Ne+p in reverse kinematics, by using the intense (4 x 10⁶ pps) ¹⁸Ne radioactive beam at the Centre de Recherches du Cyclotron RIB facility at Louvain-la-Neuve. The recoil protons were detected at 20 different angles in the LEDA segmented silicon detector. The resulting elastic scattering cross sections have been analysed using the R-matrix method. We have observed for the first time the second excited state (J^π = 1/2+, l = 0) of the proton-rich nucleus ¹⁹Na at the center-of-mass energy E_c.m. = 1.066 ± 0.003 MeV with a proton width Γ_p = 101 ± 3 keV. The Coulomb shift between the 1/2+ mirror levels in 190 and ¹⁹Na is 0.73 MeV, among the largest values currently observed in light exotic nuclei

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[en] The excitation function for the elastic-scattering reaction p(¹⁸Ne,p)¹⁸Ne was measured with the first radioactive beam from the SPIRAL facility at the GANIL laboratory and with a solid cryogenic hydrogen target. Several broad resonances have been observed, corresponding to new excited states in the unbound nucleus ¹⁹Na. In addition, two-proton emission events have been identified and are discussed

[en] The g factors of ^31,32,33Al have been measured using the β-nuclear magnetic resonance (β-NMR) technique on spin-polarized beams produced in the fragmentation of a ³⁶S (77.5 MeV/u) beam on a ⁹Be target. Nearly pure beams of Al (Z=13) isotopes were selected with the high-resolution fragment separator LISE at GANIL. An asymmetry as high as 6% has been observed in the β-NMR curve for ³²Al implanted in a Si single crystal. The magnetic moment of the N=20 nucleus ³³Al is obtained for the first time: μ(Al33,I^π=5/2⁺)=4.088(5)μ_N, while those of ^31,32Al are obtained with improved accuracy: μ(Al31,I^π=5/2⁺)=3.830(5)μ_N and μ(Al32,I^π=1⁺)=1.9516(22)μ_N. Comparison of the results to shell-model calculations in the sd and the sdpf shell-model spaces leads to the conclusion that ³³Al must contain some contribution from 2p-2h intruder configurations in its ground-state wave function. This indicates a gradual transition from the normal sd shell Si (Z=14) isotopes to the intruder Mg (Z=12) isotopes

[en] Ground-state properties of neutron-rich ^29,31Mg have been recently measured at ISOLDE/CERN in the context of shell structure far from stability. By combining the results of β-NMR and hyperfine-structure measurements unambiguous values of the nuclear spin and magnetic moment of ³¹Mg are obtained. I ^π=1/2⁺ and μ=-0.88355(15) μ_N can be explained only by an intruder ground state with at least 2p-2h excitations, revealing the weakening of the N=20 shell gap in this nucleus. This result plays an important role in the understanding of the mechanism and boundaries of the so called ''island of inversion''. (orig.)

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