Publication: First Penning-trap mass measurement of the exotic halo nucleus 11-Li

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Title	First Penning-trap mass measurement of the exotic halo nucleus 11-Li
Authors/Editors*	M. Smith, M. Brodeur, T. Brunner, S. Ettenauer, A Lapierre, R. Ringle, V.L. Ryjkov, F. Ames, P. Bricault, G.W.F. Drake, P. Delheij, D Lunney, and J. Dilling
Where published*	Phys. Rev. Lett.
How published*	Journal
Year*	2008
Volume	100
Number
Pages	in press
Publisher
Keywords
Link
Abstract	In this letter, we report a new mass for 11Li using the trapping experiment TITAN at TRIUMF's ISAC facility. This is by far the shortest-lived nuclide, t1=2 = 8:8 ms, for which a mass measurement has ever been performed with a Penning trap. Combined with our mass easurements of 8;9Li we derive a new two-neutron separation energy of 369.15(65) keV: a factor of seven more precise than the best previous value. This new value is a critical ingredient for the determination of the halo charge radius from isotope-shift measurements. We also report results from state-of-the-art atomic physics calculations using the new mass and extract a new charge radius for 11Li. This result is a remarkable confuence of nuclear and atomic physics.