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 $\nu2s_{1/2}^2$ 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.
Document type :
Journal articles
Physical Review Letters, American Physical Society, 2012, 109, pp.202503. <10.1103/PhysRevLett.109.202503>

http://hal.in2p3.fr/in2p3-00752211
Contributor : Michel Lion <>
Submitted on : Thursday, November 15, 2012 - 10:00:07 AM
Last modification on : Friday, September 11, 2015 - 9:51:28 AM

Citation

L. Gaudefroy, W. Mittig, N.A. Orr, S. Varet, M. Chartier, et al.. Direct mass measurements of 19B, 22C, 29F, 31Ne, 34Na and other light exotic nuclei. Physical Review Letters, American Physical Society, 2012, 109, pp.202503. <10.1103/PhysRevLett.109.202503>. <in2p3-00752211>

Metrics

Consultations de la notice