First direct mass-measurement of the two-neutron halo nucleus 6He and improved mass for the four-neutron halo 8He

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. Lunney 1 A. Schwenk J. Dilling
1 CSNSM SNO
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière : UMR8609
Abstract : 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.
Type de document :
Article dans une revue
Physical Review Letters, American Physical Society, 2012, 108, pp.052504. <10.1103/PhysRevLett.108.052504>


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Soumis le : mardi 28 février 2012 - 14:23:34
Dernière modification le : mercredi 27 juillet 2016 - 14:48:48

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M. Brodeur, T. Brunner, C. Champagne, S. Ettenauer, M. J. Smith, et al.. First direct mass-measurement of the two-neutron halo nucleus 6He and improved mass for the four-neutron halo 8He. Physical Review Letters, American Physical Society, 2012, 108, pp.052504. <10.1103/PhysRevLett.108.052504>. <in2p3-00674911>

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