Nuclear charge radius of $^8$He

Details Nuclear charge radius of $^8$He Nuclear charge radius of $^8$He

2008-01-03

arxiv.org/abs/0801.0601v1

Phys.Rev.Lett.99:252501,2007

Physics

Nuclear Physics

Nuclear Experiment

Scientific paper

10.1103/PhysRevLett.99.252501

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.

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