New measurement of the neutron lifetime with a large gravitational trap
| Autor: | A. P. Serebrov, A. N. Pirozhkov, M. E. Chaikovskii, A. K. Fomin, O. Zimmer, P. Geltenbort, A. V. Vassiljev, A. V. Chechkin, I. A. Krasnoschekova, I. V. Shoka, S. N. Ivanov, M. A. H. Tucker, M.G.D. van der Grinten, V. E. Varlamov, D. M. Prudnikov, T. Jenke, E. A. Kolomenskiy |
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| Přispěvatelé: | Institut Laue-Langevin (ILL), ILL |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Solid-state physics 010308 nuclear & particles physics Particle Data Group engineering.material Weak interaction [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] 01 natural sciences 7. Clean energy Coating Nucleosynthesis 0103 physical sciences engineering Neutron Atomic physics 010306 general physics Nuclear Experiment Cooling down Physical quantity |
| Zdroj: | JETP Lett. JETP Lett., 2017, 106 (10), pp.623-629. ⟨10.1134/S0021364017220143⟩ |
| Popis: | International audience; The lifetime of the neutron is one of the key physical quantities used to determine the weak interaction parameters and to test predictions of the theory of primary nucleosynthesis. The lifetime of the neutron has been measured in the reported experiment by the method of storing neutrons in a material trap with a gravitational valve. Fomblin grease UT-18 hydrogen-free fluorine polymer has been used as coating. The resistance of the coating to repeated cooling down to 80 K combined with heating up to 300 K has been studied. The probability of losses in the trap is as small as 1.5% of the neutron decay probability. The lifetime of the neutron τ$_{n}$ = (881.5 ± 0.7$_{stat}$ ± 0.6$_{syst}$)s obtained at the new step is in good agreement with a commonly accepted value of (880.2 ± 1.0) s presented by the Particle Data Group. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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