Publication: Nuclear charge radius of _8He

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Title Nuclear charge radius of _8He
Authors/Editors* P. Mueller, I. A. Sulai, A. C. C. Villari, J. A. Alcántar-Núñez, R. Alves-Conde, K. Bailey, G. W. F. drake, M. Dubois, C. Eléon, G. Gaubert, R. J. Holt, R. V. F. Janssens, N. Lecesne, Z. T. Lu, T. P. O'Connor, M. G. Saint-Laurent, J. P. Schiffer, J. C. Thomas, L. B. Wang
Where published* Phys. Rev. Lett.
How published* Journal
Year* 2008
Volume 99
Pages 252501 (4 pages)
The root-mean-square (rms) nuclear charge radius of He-8, the most neutron-rich of all particle-stable nuclei, has been determined for the first time to be 1.93(3) fm. In addition, the rms charge radius of He-6 was measured to be 2.068(11) fm, in excellent agreement with a previous result. The significant reduction in charge radius from He-6 to He-8 is an indication of the change in the correlations of the excess neutrons and is consistent with the He-8 neutron halo structure. The experiment was based on laser spectroscopy of individual helium atoms cooled and confined in a magneto-optical trap. Charge radii were extracted from the measured isotope shifts with the help of precision atomic theory calculations.
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