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.
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Journal articles
Physical Review Letters, American Physical Society, 2012, 109, pp.202503. <10.1103/PhysRevLett.109.202503>


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Submitted on : Thursday, November 15, 2012 - 10:00:00 AM
Last modification on : Monday, October 13, 2014 - 3:00:43 PM

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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>

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