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Precision ground state mass of (12)Be and an isobaric multiplet mass equation (IMME) extrapolation for 2(+) and 0(2)(+) states in the T=2, A=12 multiplet

S. Ettenauer M. Brodeur T. Brunner A. T. Gallant A. Lapierre R. Ringle M. R. Pearson P. Delheij J. Lassen D. Lunney 1 J. Dilling
1 CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Abstract : We report the mass measurement of the short-lived (12)Be nuclide (T(1/2) = 21.5 ms) performed using the Penning trap mass spectrometer TITAN at TRIUMF. Our mass excess value of 25 078.0(2.1) keV is in agreement with previous measurements, but is a factor of 7 more precise than the Atomic Mass Evaluation of 2003. To address an unresolved discussion on the spin assignment of isospin T = 2 states in (12)C and (12)O, we reevaluate the isobaric mass multiplet equation for the lowest lying T = 2 multiplet in the A = 12 system and use the extracted parameters to extrapolate from the known excited 2(+) and 0(+) states in (12)Be. Though this analysis favors the second known T = 2 state in (12)C to be 2(+), 0(+) cannot be excluded.
Keywords : TRUE CYCLOTRON FREQUENCY N=8 SHELL CLOSURE PENNING TRAP ENERGY-LEVELS ION-SOURCE ELECTRON TITAN ACCURACY LIFETIME
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http://hal.in2p3.fr/in2p3-00668104
Contributor : Christine Hadrossek <>
Submitted on : Thursday, February 9, 2012 - 9:50:50 AM
Last modification on : Wednesday, September 16, 2020 - 4:17:40 PM

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S. Ettenauer, M. Brodeur, T. Brunner, A. T. Gallant, A. Lapierre, et al.. Precision ground state mass of (12)Be and an isobaric multiplet mass equation (IMME) extrapolation for 2(+) and 0(2)(+) states in the T=2, A=12 multiplet. Physical Review C, American Physical Society, 2010, 81, pp.024314. ⟨10.1103/PhysRevC.81.024314⟩. ⟨in2p3-00668104⟩

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