Nuclear Charge Radius of He 8
2007; American Physical Society; Volume: 99; Issue: 25 Linguagem: Inglês
10.1103/physrevlett.99.252501
ISSN1092-0145
AutoresPeter Mueller, Ibrahim Sulai, A. C. C. Villari, J A Alcántara-Núñez, R. Alvès-Condé, K. Bailey, G. W. F. Drake, M. Dubois, C. Eléon, G. Gaubert, R. J. Holt, R. V. F. Janssens, N. Lecesne, Zheng‐Tian Lu, Thomas P. O’Connor, M. G. Saint‐Laurent, J. C. Thomas, Li-Bang Wang,
Tópico(s)Quantum, superfluid, helium dynamics
ResumoThe 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.
Referência(s)