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Fill and dump measurement of the neutron lifetime using an asymmetric magneto-gravitational trap

Cude-Woods, C. and Gonzalez, F. M. and Fries, E. M. and Bailey, T. and Blatnik, M. and Callahan, N. B. and Choi, J. H. and Clayton, S. M. and Currie, S. A. and Dawid, M. and Filippone, B. W. and Fox, W. and Geltenbort, P. and George, E. and Hayen, L. and Hickerson, K. P. and Hoffbauer, M. A. and Hoffman, K. and Holley, A. T. and Ito, T. M. and Komives, A. and Liu, C.-Y. and Makela, M. and Morris, C. L. and Musedinovic, R. and O'Shaughnessy, C. and Pattie, R. W. and Ramsey, J. and Salvat, D. J. and Saunders, A. and Sharapov, E. I. and Slutsky, S. and Su, V. and Sun, X. and Swank, C. and Tang, Z. and Uhrich, W. and Vanderwerp, J. and Walstrom, P. and Wang, Z. and Wei, W. and Young, A. R. (2022) Fill and dump measurement of the neutron lifetime using an asymmetric magneto-gravitational trap. Physical Review C, 106 (6). Art. No. 065506. ISSN 2469-9985. doi:10.1103/physrevc.106.065506.

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The past two decades have yielded several new measurements and reanalysis of older measurements of the neutron lifetime. These have led to a 4.4 standard deviation discrepancy between the most precise measurements of the neutron decay rate producing protons in cold neutron beams and the most precise lifetime measured in neutron storage experiments. Measurements using different techniques are important for investigating whether there are unidentified systematic effects in any of the measurements. In this paper we report a new measurement using the Los Alamos asymmetric magneto-gravitational trap where the surviving neutrons are counted external to the trap using the fill and dump method. The new measurement gives a free neutron lifetime of τₙ = 876.3(2.4)_(stat)(0.8)_(syst). Although this measurement is not as precise, it is in statistical agreement with previous results using in situ counting in the same apparatus.

Item Type:Article
Related URLs:
URLURL TypeDescription
Fries, E. M.0000-0002-3788-8096
Blatnik, M.0000-0003-3496-0010
Filippone, B. W.0000-0002-2618-2688
Hickerson, K. P.0000-0001-7647-119X
Morris, C. L.0000-0003-2141-0255
Swank, C.0000-0001-5471-7312
Wei, W.0000-0002-9670-4787
Additional Information:This work was supported by the LANL LDRD Program; the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Awards No. DE-FG02-ER41042, No. DE-AC52-06NA25396, No. DE-AC05-00OR2272, and No. 89233218CNA000001 under proposal LANLEDM; NSF Grants No. 1614545, No. 1914133, No. 1506459, No. 1553861, No. 1812340, No. 1714461, No. 2110898, and No. 1913789; and a NIST precision measurements Grant.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-ER41042
Department of Energy (DOE)DE-AC52-06NA25396
Department of Energy (DOE)DE-AC05-00OR2272
Department of Energy (DOE)89233218CNA000001
National Institute of Standards and Technology (NIST)UNSPECIFIED
Issue or Number:6
Record Number:CaltechAUTHORS:20230125-514504700.12
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:118934
Deposited By: Research Services Depository
Deposited On:17 Feb 2023 23:24
Last Modified:21 Feb 2023 17:48

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