Journal
SCIENCE
Volume 360, Issue 6389, Pages 627-631Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aan8895
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Funding
- Los Alamos Laboratory Directed Research and Development (LDRD) office [20140568DR]
- LDRD Program of Oak Ridge National Laboratory [8215]
- National Science Foundation [130692, 1307426, 161454, 1306997, 1553861]
- NIST Precision Measurement Grant
- IU Center for Space Time Symmetries (IUCSS)
- LANSCE Rosen Scholarship program
- U.S. DOE Low Energy Nuclear Physics [DE-FG02-97ER41042, DE-AC05-00OR22725]
- Direct For Mathematical & Physical Scien [1306997] Funding Source: National Science Foundation
- Division Of Physics [1506459] Funding Source: National Science Foundation
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The precise value of the mean neutron lifetime, tau(n), plays an important role in nuclear and particle physics and cosmology. It is used to predict the ratio of protons to helium atoms in the primordial universe and to search for physics beyond the Standard Model of particle physics. We eliminated loss mechanisms present in previous trap experiments by levitating polarized ultracold neutrons above the surface of an asymmetric storage trap using a repulsive magnetic field gradient so that the stored neutrons do not interact with material trap walls. As a result of this approach and the use of an in situ neutron detector, the lifetime reported here [877.7 +/- 0.7 (stat) +0.4/-0.2 (sys) seconds] does not require corrections larger than the quoted uncertainties.
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