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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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arxiv 1107.1684 v4 pith:GY6Q5T77 submitted 2011-07-08 nucl-ex

M. Brodeur , T. Brunner , C. Champagne , S. Ettenauer , M. J. Smith , A. Lapierre , R. Ringle , V. L. Ryjkov
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S. Bacca P. Delheij G. W. F. Drake D. Lunney A. Schwenk J. Dilling
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keywords massdirectfirsthaloimprovedmass-measurementtwo-neutronaddition
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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.

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Cited by 2 Pith papers

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  1. Finite-range EFT for the $E1$ strength distribution of ${}^6$He

    nucl-th 2026-06 unverdicted novelty 6.0 of 10

    Finite-range Halo EFT with separable interactions computes the E1 strength distribution of ⁶He at NLO and rms charge radius 2.00 ± 0.09 fm, both agreeing with data within theory errors.

  2. Renormalizing Two-Neutron Halo Nuclei Without Neutron-Core Interaction

    nucl-th 2025-12 conditional novelty 6.0 of 10

    The Hongo-Son two-neutron halo EFT needs an extra renormalization condition—one input radius or scattering amplitude—before charge and matter radii can be predicted separately, and the resulting coupling has a Landau pole.

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