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

Cude-Woods, C.; Gonzalez, F. M.; Fries, E. M.; Bailey, T.; Blatnik, M.; Callahan, N. B.; Choi, J. H.; Clayton, S. M.; Currie, S. A.; Dawid, M.; Filippone, B. W.; Fox, W.; Geltenbort, P.; George, E.; Hayen, L.; Hickerson, K. P.; Hoffbauer, M. A.; Hoffman, K.; Holley, A. T.; Ito, T. M.; Komives, A.; Liu, C.-Y.; Makela, M.; Morris, C. L.; Musedinovic, R.; O'Shaughnessy, C.; Pattie, Jr., R. W.; Ramsey, J.; Salvat, D. J.; Saunders, A.; Sharapov, E. I.; Slutsky, S.; Su, V.; Sun, X.; Swank, C.; Tang, Z.; Uhrich, W.; Vanderwerp, J.; Walstrom, P.; Wang, Z.; Wei, W.; Young, A. R.

doi:10.1103/physrevc.106.065506

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

Journal Article · Mon Dec 26 00:00:00 EST 2022 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.106.065506· OSTI ID:1907568

Cude-Woods, C. ^[1]; Gonzalez, F. M. ^[2]; Fries, E. M. ^[3]; Bailey, T. ^[4]; Blatnik, M. ^[3]; Callahan, N. B. ^[5]; Choi, J. H. ^[1]; Clayton, S. M. ^[6]; Currie, S. A. ^[6]; Dawid, M. ^[7]; Filippone, B. W. ^[3]; Fox, W. ^[7]; Geltenbort, P. ^[8]; George, E. ^[9]; Hayen, L. ^[1]; Hickerson, K. P. ^[3]; Hoffbauer, M. A. ^[6]; Hoffman, K. ^[9]; Holley, A. T. ^[9]; Ito, T. M. ^[6] more »

North Carolina State Univ., Raleigh, NC (United States); Duke Univ., Durham, NC (United States). Triangle Universities Nuclear Laboratory
Indiana Univ., Bloomington, IN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
California Institute of Technology (CalTech), Pasadena, CA (United States)
North Carolina State Univ., Raleigh, NC (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Indiana Univ., Bloomington, IN (United States)
Inst. Laue-Langevin (ILL), Grenoble (France)
Tennessee Technological Univ., Cookeville, TN (United States)
DePauw University, Greencastle, IN (United States)
East Tennessee State Univ. (ETSU), Johnson CIty, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation)

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. In this work, the new measurement gives a free neutron lifetime of $$τ_n$$ = 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.

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Research Organization:: Duke Univ., Durham, NC (United States). Triangle Universities Nuclear Laboratory; Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF); National Institute of Standards and Technology (NIST)

Grant/Contract Number:: FG02-97ER41033; FG02-97ER41042; AC52-06NA25396; AC05-00OR2272; 89233218CNA000001; 1614545; 1914133; 1506459; 1553861; 1812340; 1714461; 2110898; 1913789; FG02-ER41042

OSTI ID:: 1907568

Alternate ID(s):: OSTI ID: 1906742

Journal Information:: Physical Review. C, Vol. 106, Issue 6; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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