High-precision Penning trap mass measurements of 9,10Be and the one-neutron halo nuclide 11Be

Penning trap mass measurements of ⁹Be, ¹⁰Be (t1 / 2 = 1.51 My), and the one-neutron halo nuclide ¹¹Be (t1 / 2 = 13.8 s) have been performed using TITAN at TRIUMF. The resulting ¹¹Be mass excess (ME = 20 177.60 (58) keV) is in agreement with the current Atomic Mass Evaluation (AME03) [G. Audi, et al., Nucl. Phys. A 729 (2003) 337] value, but is over an order of magnitude more precise. The precision of the mass values of ^9,10Be have been improved by about a factor of four and reveal a ≈ 2 σ deviation from the AME mass values. Results of new atomic physics calculations are presented for the isotope shift of ¹¹Be relative to ⁹Be, and it is shown that the new mass values essentially remove atomic mass uncertainties as a contributing factor in determining the relative nuclear charge radius from the isotope shift. The new mass values of ^10,11Be also allow for a more precise determination of the single-neutron binding energy of the halo neutron in ¹¹Be. © 2009 Elsevier B.V. All rights reserved.

Duke Scholars

Author Jens Dilling Physics