Gordon W. F. Drake

Variational calculations of dispersion coefficients for interactions among H, He, and Li atoms

The dispersion coefficients

Nuclear Charge Radii of 9,11Li: The Influence of Halo Neutrons

{\mathit{C}}_{6}

First Penning-trap mass measurement of the exotic halo nucleus 11Li.

,

Laser Spectroscopic Determination of the ^6He Nuclear Charge Radius

{\mathit{C}}_{8}

Nuclear charge radius of 8He.

, and

High precision variational calculations for the 1s21S state of H − and the 1s21s, 1s2s 1s and 1s2s 3s states of helium☆

{\mathit{C}}_{10}

Nuclear Charge Radii of Be-7, Be-9, Be-10 and the one-neutron halo nucleus Be-11

for the interactions among H, He, and Li are calculated using variational wave functions in Hylleraas basis sets with multiple exponential scale factors. With these highly correlated wave functions, significant improvements are made upon previous calculations and our results provide definitive values for these coefficients. \textcopyright{} 1996 The American Physical Society.

First direct mass measurement of the two-neutron halo nucleus 6He and improved mass for the four-neutron halo 8He.

The nuclear charge radius of 11Li has been determined for the first time by high-precision laser spectroscopy. On-line measurements at TRIUMF-ISAC yielded a 7Li-11Li isotope shift (IS) of 25 101.23(13) MHz for the Doppler-free [FORMULA: SEE TEXT]transition. IS accuracy for all other bound Li isotopes was also improved. Differences from calculated mass-based IS yield values for change in charge radius along the isotope chain. The charge radius decreases monotonically from 6Li to 9Li, and then increases from 2.217(35) to 2.467(37) fm for 11Li. This is compared to various models, and it is found that a combination of halo neutron correlation and intrinsic core excitation best reproduces the experimental results.

Isotope shift measurements in the 2s1/2 → 2p3/2 transition of Be+ and extraction of the nuclear charge radii for 7, 10, 11Be

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, and J. Dilling TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver BC, Canada Technische Universität München, E12, James Franck Strasse, Garching, Germany Department of Physics, University of Windsor, Windsor, Ontario, Canada and CSNSM/CNRS/IN2P3, Universite de Paris-Sud, F-91405, Orsay, France (Dated: July 21, 2008)

A multiplet table for neutral helium (4He I) with transition rates

We have performed precision laser spectroscopy on individual 6He (t(1/2)=0.8 s) atoms confined and cooled in a magneto-optical trap, and measured the isotope shift between 6He and 4He to be 43 194.772+/-0.056 MHz for the 2(3)S1-3(3)P2 transition. Based on this measurement and atomic theory, the nuclear charge radius of 6He is determined for the first time in a method independent of nuclear models to be 2.054+/-0.014 fm. The result is compared with the values predicted by a number of nuclear structure calculations and tests their ability to characterize this loosely bound halo nucleus.