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The first direct mass-measurement of $^{6}$He has been performed with theTITAN Penning trap mass spectrometer at the ISAC facility. In addition, themass of $^{8}$He was determined with improved precision over our previousmeasurement. 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 fromthe literature of 4$\sigma$. With these new mass values and the previouslymeasured atomic isotope shifts we obtain charge radii of 2.060(8) fm and1.959(16) fm for $^{6}$He and $^{8}$He respectively. We present a detailedcomparison to nuclear theory for $^6$He, including new hyperspherical harmonicsresults. A correlation plot of the point-proton radius with the two-neutronseparation energy demonstrates clearly the importance of three-nucleon forces.

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