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18 April 2024

» arxiv » 1107.1684

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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 ; A. Schwenk ; J. Dilling ;
Date:	8 Jul 2011
Abstract:	The first direct mass-measurement of $^{6}$He (half-life $t_{1/2}$ = 807 ms) has been carried out with the TITAN Penning trap mass spectrometer at the ISAC facility. In addition, the mass of $^{8}$He ($t_{1/2}$ = 119 ms) 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) = 8.033 934 435(114) u. The $^{6}$He value shows a deviation from the literature of 4$sigma$. Very precise masses are required for extracting charge radii from optical spectroscopy measurements and atomic theory. With these recent mass measurements we obtain updated values for the charge radii of 2.059(7) fm and 1.959(16) fm for $^{6}$He and $^{8}$He, respectively, an improvement in precision of 23% and 38%. Here 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.
Source:	arXiv, 1107.1684
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