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First direct mass-measurement of the two-neutron halo nucleus 6He and improved mass for the four-neutron halo 8He
Brodeur M., Brunner T., Champagne C., Ettenauer S., Smith M.J. et al
Physical Review Letters 108 (2012) 052504 - http://hal.in2p3.fr/in2p3-00674911
Physique/Physique Nucléaire Expérimentale
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
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
http://www-csnsm.in2p3.fr/
CNRS : UMR8609 – IN2P3 – Université Paris XI - Paris Sud
batiments 104 et 108 - 91405 Orsay Campus
France
CSNSM SNO
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.

Articles dans des revues avec comité de lecture
2012
Physical Review Letters (Phys. Rev. Lett.)
Publisher American Physical Society
ISSN 0031-9007 (eISSN : 1079-7114)
108
052504

CSNSM SNO
21.10.Dr 27.20.+n 21.45.-v
4 pages, 2 figures
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1107.1684