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Physical Review Letters 109 (2012) 202503
Direct mass measurements of 19B, 22C, 29F, 31Ne, 34Na and other light exotic nuclei
L. Gaudefroy1, 2, W. Mittig1, N.A. Orr3, S. Varet2, M. Chartier, P. Roussel-Chomaz1, J. P. Ebran2, B. Fernández-Domínguez, G. Frémont1, P. Gangnant1, A. Gillibert4, S. Grévy1, J. F. Libin1, V. A. Maslov, S. Paschalis, B. Pietras, Yu. -E. Penionzhkevich, C. Spitaels1, A. C. C. Villari
(2012)

We report on direct time-of-flight based mass measurements of 16 light neutron-rich nuclei. These include the first determination of the masses of the Borromean drip-line nuclei $^{19}$B, $^{22}$C and $^{29}$F as well as that of $^{34}$Na. In addition, the most precise determinations to date for $^{23}$N and $^{31}$Ne are reported. Coupled with recent interaction cross-section measurements, the present results support the occurrence of a two-neutron halo in $^{22}$C, with a dominant $\nu2s_{1/2}^2$ configuration, and a single-neutron halo in $^{31}$Ne with the valence neutron occupying predominantly the 2$p_{3/2}$ orbital. Despite a very low two-neutron separation energy the development of a halo in $^{19}$B is hindered by the 1$d_{5/2}^2$ character of the valence neutrons.
1:  GANIL - Grand Accélérateur National d'Ions Lourds
2:  DAM/DIF - DAM Île-de-France
3:  LPCC - Laboratoire de Physique Corpusculaire de Caen
4:  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
structure nucléaire
Physics/Nuclear Experiment
Fulltext link: 
http://fr.arXiv.org/abs/1211.3235