First direct mass-measurement of the two-neutron halo nucleus 6He and improved mass for the four-neutron halo 8He
| Autor: | Brodeur, M., Brunner, T., Champagne, C., Ettenauer, S., Smith, M. J., Lapierre, A., Ringle, R., Ryjkov, V. L., Bacca, S., Delheij, P., Drake, G. W. F., Lunney, D., Schwenk, A., Dilling, J. |
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| Přispěvatelé: | CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Physical Review Letters Physical Review Letters, American Physical Society, 2012, 108, pp.052504. ⟨10.1103/PhysRevLett.108.052504⟩ |
| ISSN: | 0031-9007 1079-7114 |
| DOI: | 10.1103/PhysRevLett.108.052504⟩ |
| Popis: | 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. Comment: 4 pages, 2 figures |
| Databáze: | OpenAIRE |
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