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Direct mass measurements of 19B, 22C, 29F, 31Ne, 34Na and other light exotic nuclei
Gaudefroy L., Mittig W., Orr N.A., Varet S., Chartier M. et al
Physical Review Letters 109 (2012) 202503 - http://hal.in2p3.fr/in2p3-00752211
Physics/Nuclear Experiment
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
1:  GANIL - Grand Accélérateur National d'Ions Lourds
http://www.ganil-spiral2.eu
CNRS : UPR3266 – IN2P3 – CEA : DSM/GANIL
Bvd Henri Becquerel - BP 55027 - 14076 CAEN CEDEX 5
France
2:  DAM/DIF - DAM Île-de-France
http://www-dam.cea.fr/
CEA : DAM/DIF
CEA Bruyères-le-Châtel 91297 Arpajon cedex
France
3:  LPCC - Laboratoire de Physique Corpusculaire de Caen
http://www.lpc-caen.in2p3.fr/
CNRS : UMR6534 – IN2P3 – Université de Caen Basse-Normandie – Ecole Nationale Supérieure d'Ingénieurs de Caen
ENSICAEN - 6, boulevard du Marechal Juin 14050 Caen Cedex
France
4:  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
CEA : DSM/IRFU
France
structure nucléaire
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.

Article in peer-reviewed journal
2012
Physical Review Letters (Phys. Rev. Lett.)
Publisher American Physical Society
ISSN 0031-9007 (eISSN : 1079-7114)
109
202503

GANIL 2012-118 A
21.10.Dr, 21.10.Gv, 21.60.Jz
5 pages, expérience GANIL/SISSI
Fulltext link: 
http://fr.arXiv.org/abs/1211.3235