title: Direct mass measurements of 19B, 22C, 29F, 31Ne, 34Na and other light exotic nuclei.
abstract: 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 ν2s(1/2)(2) configuration, and a single-neutron halo in (31)Ne with the valence neutron occupying predominantly the 2p(3/2) orbital. Despite a very low two-neutron separation energy the development of a halo in (19)B is hindered by the 1d(5/2)(2) character of the valence neutrons.
authors.affiliation: GANIL, CEA/DSM-CNRS/IN2P3, BP 55027, F-14076 Caen, France. laurent.gaudefroy@cea.fr
authors.forename: L
authors.initials: L
authors.lastname: Gaudefroy
authors.forename: W
authors.initials: W
authors.lastname: Mittig
authors.forename: N A
authors.initials: NA
authors.lastname: Orr
authors.forename: S
authors.initials: S
authors.lastname: Varet
authors.forename: M
authors.initials: M
authors.lastname: Chartier
authors.forename: P
authors.initials: P
authors.lastname: Roussel-Chomaz
authors.forename: J P
authors.initials: JP
authors.lastname: Ebran
authors.forename: B
authors.initials: B
authors.lastname: Fernández-Domínguez
authors.forename: G
authors.initials: G
authors.lastname: Frémont
authors.forename: P
authors.initials: P
authors.lastname: Gangnant
authors.forename: A
authors.initials: A
authors.lastname: Gillibert
authors.forename: S
authors.initials: S
authors.lastname: Grévy
authors.forename: J F
authors.initials: JF
authors.lastname: Libin
authors.forename: V A
authors.initials: VA
authors.lastname: Maslov
authors.forename: S
authors.initials: S
authors.lastname: Paschalis
authors.forename: B
authors.initials: B
authors.lastname: Pietras
authors.forename: Yu-E
authors.initials: YE
authors.lastname: Penionzhkevich
authors.forename: C
authors.initials: C
authors.lastname: Spitaels
authors.forename: A C C
authors.initials: AC
authors.lastname: Villari