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Measurement of the Free Neutron Lifetime in a Magneto-Gravitational Trap with In Situ Detection

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arxiv 2409.05560 v1 pith:VOFSPEA6 submitted 2024-09-09 nucl-ex

Measurement of the Free Neutron Lifetime in a Magneto-Gravitational Trap with In Situ Detection

R. Musedinovic (1) , L. S. Blokland (2) , C. B. Cude-Woods (3) , M. Singh (3) , M. A. Blatnik (3 , 4) , N. Callahan (5) , J. H. Choi (1)
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S. Clayton (3) B. W. Filippone (4) W. R. Fox (2) E. Fries (4) P. Geltenbort (6) F. M. Gonzalez (7) L. Hayen (1) K. P. Hickerson (4) A. T. Holley (8) T. M. Ito (3) A. Komives (9) S Lin (3) Chen-Yu Liu (10) M. F. Makela (3) C. M. O'Shaughnessy (3) R. W. Pattie Jr (11) J. C. Ramsey (7) D. J. Salvat (2) A. Saunders (7) S. J. Seestrom (3) E. I. Sharapov (12) Z. Tang (3) F. W. Uhrich (3) J. Vanderwerp (2) P. Walstrom (3) Z. Wang (3) A. R. Young (1 13) C. L. Morris (3)((1) North Carolina State University (2) Indiana University Bloomington (3) Los Alamos National Laboratory (4) Kellogg Radiation Laboratory California Institute of Technology (5) Argonne National Laboratory (6) Institut Laue-Langevin (7) Oak Ridge National Laboratory (8) Tennessee Technological University (9) DePauw University (10) University of Illinois (11) East Tennessee State University (12) Joint Institute for Nuclear Research (13) Triangle Universities Nuclear Laboratory)
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Here we publish three years of data for the UCNtau experiment performed at the Los Alamos Ultra Cold Neutron Facility at the Los Alamos Neutron Science Center. These data are in addition to our previously published data. Our goals in this paper are to better understand and quantify systematic uncertainties and to improve the lifetime statistical precision. We report a measured value for these runs from 2020-2022 for the neutron lifetime of 877.94+/-0.37 s; when all the data from UCNtau are averaged we report an updated value for the lifetime of 877.82+/-0.22 (statistical)+0.20-0.17 (systematic) s. We utilized improved monitor detectors, reduced our correction due to UCN upscattering on ambient gas, and employed four different main UCN detector geometries both to reduce the correction required for rate dependence and explore potential contributions due to phase space evolution.

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    nucl-th 2025-09 conditional novelty 6.0

    The first quantum Monte Carlo evaluation of the nuclear-structure-dependent radiative correction in carbon-10 confirms the NCSM dispersion result, with the residual uncertainty set by two undetermined low-energy constants.