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We report on direct time-of-flight based mass measurements of 16 lightneutron-rich nuclei. These include the first determination of the masses of theBorromean 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 $^{23}$Nand $^{31}$Ne are reported. Coupled with recent interaction cross-sectionmeasurements, the present results support the occurrence of a two-neutron haloin $^{22}$C, with a dominant $\nu2s_{1/2}^2$ configuration, and asingle-neutron halo in $^{31}$Ne with the valence neutron occupyingpredominantly the 2$p_{3/2}$ orbital. Despite a very low two-neutron separationenergy the development of a halo in $^{19}$B is hindered by the 1$d_{5/2}^2$character of the valence neutrons.

Direct mass measurements of 19B, 22C, 29F, 31Ne, 34Na and other light exotic nuclei