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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.
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Contributor : Michel Lion <>
Submitted on : Monday, January 7, 2008 - 3:27:46 PM
Last modification on : Friday, September 4, 2020 - 3:02:05 PM

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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, American Physical Society, 2007, 99, pp.252501. ⟨10.1103/PhysRevLett.99.252501⟩. ⟨in2p3-00202461⟩



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