208 articles – 1675 references  [version française]
 HAL: in2p3-00752211, version 1
 arXiv: 1211.3235
 Physical Review Letters 109 (2012) 202503
 Direct mass measurements of 19B, 22C, 29F, 31Ne, 34Na and other light exotic nuclei
 (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.
 Research team: structure nucléaire
 Subject(s) : Physics/Nuclear Experiment