| Subject(s): |
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Physics/Nuclear Experiment
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| Title: |
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Direct mass measurements of 19B, 22C, 29F, 31Ne, 34Na and other light exotic nuclei |
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| Author: |
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L. Gaudefroy1, 2, W. Mittig1, N.A. Orr3, S. Varet2, M. Chartier, P. Roussel-Chomaz1, J. P. Ebran2, B. Fernández-Domínguez, G. Frémont1, P. Gangnant1, A. Gillibert4, S. Grévy1, J. F. Libin1, V. A. Maslov, S. Paschalis, B. Pietras, Yu. -E. Penionzhkevich, C. Spitaels1, A. C. C. Villari |
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| Laboratory: |
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| Research team: |
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structure nucléaire |
| Abstract: |
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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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| Document of the type: |
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Article in peer-reviewed journal |
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Publication or writing
date: |
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2012 |
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| Journal: |
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| Physical Review Letters (Phys. Rev. Lett.) |
| Publisher |
American Physical Society |
| ISSN |
0031-9007 (eISSN : 1079-7114) |
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| Volume: |
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109 |
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| Page/Article: |
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202503 |
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| Internal call number: |
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GANIL 2012-118 A |
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| PACS Classification: |
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21.10.Dr, 21.10.Gv, 21.60.Jz |
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| Comments: |
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5 pages, expérience GANIL/SISSI |
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