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First Penning-trap mass measurement in the millisecond half-life range: The exotic halo nucleus Li-11

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 1 J. Dilling
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière : UMR8609
Abstract : Perched precariously on the brink of nuclear stability, 11Li has the lowest two-neutron binding energy of all nuclei. This gives rise to the exotic phenomena of a nuclear halo that has a wavefunction extending beyond the range normally allowed for by the strong interaction. The most accurate mass measurements are achieved using Penning traps. In this letter, we report a new mass for 11Li using the TITAN trapping experiment at TRIUMF's ISAC facility where 'designer atomic nuclei' can be produced and studied in detail. 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. We derive a new two-neutron separation energy of 369.15(65) keV: seven times more precise than the best previous value. We also report results from state-of-the-art atomic-physics calculations using the new mass and extract a new charge radius for 11Li from recent isotope shift measurements
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Submitted on : Thursday, May 30, 2013 - 11:29:16 AM
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M. Smith, M. Brodeur, T. Brunner, S. Ettenauer, A Lapierre, et al.. First Penning-trap mass measurement in the millisecond half-life range: The exotic halo nucleus Li-11. Physical Review Letters, American Physical Society, 2008, 101, pp.202501. ⟨10.1103/PhysRevLett.101.202501⟩. ⟨in2p3-00828072⟩



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