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

HAL: in2p3-00674911, version 1

arXiv: 1107.1684

DOI: 10.1103/PhysRevLett.108.052504

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Physical Review Letters 108 (2012) 052504

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. Lunney¹, A. Schwenk, J. Dilling

(2012)

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.

1:	CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse

Research team: CSNSM SNO

Subject(s)

Physics/Nuclear Experiment

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http://fr.arXiv.org/abs/1107.1684


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Submitted on: Tuesday, 28 February 2012 14:23:34
Updated on: Wednesday, 28 March 2012 10:42:39