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Direct Mass Measurement of the Four-Neutron Halo Nuclide He-8

V.L. Ryjkov M. Brodeur T. Brunner M. Smith R. Ringle A. Lapierre F. Ames P. Bricault M. Dombsky 1 P. Delheij D. Lunney 2 M.R. Pearson 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 : A high-precision Penning trap mass measurement of the exotic (8)He nuclide (T(1/2)=119 ms) has been carried out resulting in a reduction of the uncertainty of the halo binding energy by over an order of magnitude. The new mass, determined with a relative uncertainty of 9.2x10(-8) (delta m=690 eV) is 13 keV less bound than the previously accepted value. The mass measurement is of great relevance for the recent charge-radius measurement of (8)He [P. Mueller , Phys. Rev. Lett. 99, 252501 (2007).]. The (8)He mass is the first result from the newly-commissioned Penning trap: TITAN (TRIUMF's Ion Trap for Atomic and Nuclear science) at the ISAC (Isotope Separator and Accelerator) radioactive beam facility at TRIUMF.
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Submitted on : Thursday, May 23, 2013 - 5:14:33 PM
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V.L. Ryjkov, M. Brodeur, T. Brunner, M. Smith, R. Ringle, et al.. Direct Mass Measurement of the Four-Neutron Halo Nuclide He-8. Physical Review Letters, American Physical Society, 2008, 101, pp.012501. ⟨10.1103/PhysRevLett.101.012501⟩. ⟨in2p3-00825476⟩



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