High-precision Penning trap mass measurements of (9,10)Be and the one-neutron halo nuclide (11)Be
Abstract
Penning trap mass measurements of (9)Be, (10)Be (t(1/2) = 1.51 My), and the one-neutron halo nuclide (11)Be (t(1/2) = 13.8 s) have been performed using TITAN at TRIUMF. The resulting (11)Be mass excess (ME = 20177.60(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 (9,10)Be have been improved by about a factor of four and reveal a approximate to 2 sigma deviation from the AME mass values. Results of new atomic physics calculations are presented for the isotope shift of (11)Be relative to (9)Be. 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 (10,11)Be also allow for a more precise determination of the single-neutron binding energy of the halo neutron in (11)Be. (C) 2009 Elsevier B.V. All rights reserved.