Skip to Main content Skip to Navigation
Journal articles

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.
Document type :
Journal articles
Complete list of metadata

http://hal.in2p3.fr/in2p3-00674911
Contributor : Christine Hadrossek Connect in order to contact the contributor
Submitted on : Tuesday, February 28, 2012 - 2:23:34 PM
Last modification on : Wednesday, September 16, 2020 - 5:40:34 PM

Links full text

Identifiers

Collections

Citation

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⟩

Share

Metrics

Record views

152