Nuclear charge radius of $^8$He

A. C. C. Villari; C. Eleon; G. Gaubert; G. W. F. Drake; I. A. Sulai; J. A. Alcantara-Nunez; J.-C. Thomas; K. Bailey; L.-B. Wang; M. Dubois

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Nuclear charge radius of ⁸He

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arxiv 0801.0601 v1 pith:TLJQTFXG submitted 2008-01-03 nucl-ex

Nuclear charge radius of ⁸He

P. Mueller , I. A. Sulai , A. C. C. Villari , J. A. Alcantara-Nunez , R. Alves-Conde , K. Bailey , G. W. F. Drake , M. Dubois

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C. Eleon G. Gaubert R. J. Holt R. V. F. Janssens N. Lecesne Z.-T. Lu T. P. O'Connor M.-G. Saint-Laurent J.-C. Thomas L.-B. Wang

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The root-mean-square (rms) nuclear charge radius of ^8He, 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 ^6He was measured to be 2.068(11) fm, in excellent agreement with a previous result. The significant reduction in charge radius from ^6He to ^8He is an indication of the change in the correlations of the excess neutrons and is consistent with the ^8He 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.

Nuclear charge radius of ⁸He

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