New Neutron Lifetime Measurements with the Big Gravitational Trap and Review of Neutron Lifetime Data
| Autor: | A. P. Serebrov, V. E. Varlamov, P. Geltenbort, A. V. Vassiljev, M.G.D. van der Grinten, A. V. Chechkin, A. N. Pirozhkov, A. K. Fomin, I. A. Krasnoschekova, O. Zimmer, I. V. Shoka, Mark Tucker, S. N. Ivanov, E. A. Kolomensky, T. Jenke, M. E. Chaikovskiy, D. M. Prudnikov |
|---|---|
| Přispěvatelé: | Institut Laue-Langevin ( ILL ), ILL, Institut Laue-Langevin (ILL) |
| Rok vydání: | 2018 |
| Předmět: |
Physics
010308 nuclear & particles physics Physical constant Extrapolation [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] Weak interaction 01 natural sciences 7. Clean energy Nuclear physics Gravitation Collision frequency Big Bang nucleosynthesis 13. Climate action 0103 physical sciences Thermal Neutron [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex] Nuclear Experiment 010306 general physics |
| Zdroj: | KnE Energ.Phys. 3rd International Conference on Particle Physics and Astrophysics 3rd International Conference on Particle Physics and Astrophysics, Oct 2017, Moscow, Russia. KnE Energ.Phys., 3, pp.121-128, 2018, 〈10.18502/ken.v3i1.1733〉 3rd International Conference on Particle Physics and Astrophysics, Oct 2017, Moscow, Russia. pp.121-128, ⟨10.18502/ken.v3i1.1733⟩ 'KnE Energy ', vol: 3, pages: 121-128 (2018) |
| ISSN: | 2413-5453 |
| Popis: | Neutron lifetime is one of the most important physical constants which determines parameters of the weak interaction and predictions of primordial nucleosynthesis theory. In our experiment we measure the storage time of UCN in the material trap coated with a hydrogen-free fluorine-containing polymer (Fomblin grease UT-18). The stability of this coating to multiple thermal cycles between 80 K and 300 K was tested. The achieved storage time is only 1.5% less than free neutron lifetime. Using additional surface, which can be plunged into the trap to change the collision frequency of UCN with walls, we calculate free neutron lifetime by extrapolation to zero collision frequency. The result of the measurements with this new experimental setup is τ n =881.5±0.7 stat ±0.6 syst s τn=881.5±0.7stat±0.6systs which is consistent with the conventional value of 880.2±1.0 880.2±1.0 presented in Particle Data Group. In conclusion, we present an analysis of currently-available data on measurements of neutron. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|