| Thème(s) : |
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Physique/Physique Nucléaire Expérimentale
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| Titre : |
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First direct mass-measurement of the two-neutron halo nucleus 6He and improved mass for the four-neutron halo 8He |
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| Auteur : |
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M. Brodeur, T. Brunner, C. Champagne, S. Ettenauer, M. J. Smith, A. Lapierre, R. Ringle, V. L. Ryjkov, S. Bacca, P. Delheij, G. W. F. Drake, D. Lunney1, A. Schwenk, J. Dilling |
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| Laboratoire : |
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| équipe(s) de recherche : |
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CSNSM SNO |
| Résumé : |
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The first direct mass-measurement of $^{6}$He has been performed with the TITAN Penning trap mass spectrometer at the ISAC facility. In addition, the mass of $^{8}$He was determined with improved precision over our previous measurement. The obtained masses are $m$($^{6}$He) = 6.018 885 883(57) u and $m$($^{8}$He) = 8.033 934 44(11) u. The $^{6}$He value shows a deviation from the literature of 4$\sigma$. With these new mass values and the previously measured atomic isotope shifts we obtain charge radii of 2.060(8) fm and 1.959(16) fm for $^{6}$He and $^{8}$He respectively. We present a detailed comparison to nuclear theory for $^6$He, including new hyperspherical harmonics results. A correlation plot of the point-proton radius with the two-neutron separation energy demonstrates clearly the importance of three-nucleon forces. |
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| Type de publication : |
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Articles dans des revues avec comité de lecture |
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Date de publication
ou d'écriture : |
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2012 |
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| Nom du périodique : |
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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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108 |
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| Page/Article : |
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052504 |
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| Identifiant local : |
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CSNSM SNO |
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| Classification PACS : |
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21.10.Dr 27.20.+n 21.45.-v |
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| Commentaire : |
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4 pages, 2 figures |
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