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Journal Articles Physical Review Letters Year : 2007

Nuclear charge radius of $^8$He

Abstract

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.

Dates and versions

in2p3-00202461 , version 1 (07-01-2008)

Identifiers

Cite

P. Mueller, I.A. Sulai, A.C.C. Villari, J.A. Alcantara-Nunez, R. Alves Condé, et al.. Nuclear charge radius of $^8$He. Physical Review Letters, 2007, 99, pp.252501. ⟨10.1103/PhysRevLett.99.252501⟩. ⟨in2p3-00202461⟩
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