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Measurement of the Neutron Lifetime Using a Gravitational Trap and a Low-Temperature Fomblin Coating |
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| Authors: | A. Serebrov V. Varlamov A. Kharitonov A. Fomin Yu. Pokotilovski P. Geltenbort J. Butterworth I. Krasnoschekova M. Lasakov R. Tal’daev A. Vassiljev O. Zherebtsov |
| Affiliation: | Petersburg Nuclear Physics Institute, Russian Academy of Sciences, 188300 Gatchina, Leningrad District, Russia;Joint Institute for Nuclear Research, Dubna, Moscow Region, 141980, Russia;Institut Max von Laue—Paul Langevin, B.P. 156, 38042 Grenoble Cedex 9, France;Petersburg Nuclear Physics Institute, Russian Academy of Sciences, 188300 Gatchina, Leningrad District, Russia |
| Abstract: | We present a new value for the neutron lifetime of 878.5 ± 0.7stat. ± 0.3syst. This result differs from the world average value by 6.5 standard deviations and by 5.6 standard deviations from the previous most precise result. However, this new value for the neutron lifetime together with a β-asymmetry in neutron decay, A0, of −0.1189(7) is in a good agreement with the Standard Model. |
| Keywords: | neutron lifetime ultracold neutrons |