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Improved neutron lifetime measurement with UCNτ

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arxiv 2106.10375 v2 pith:7B5N7WPH submitted 2021-06-18 nucl-ex hep-exnucl-th

Improved neutron lifetime measurement with UCNτ

F. M. Gonzalez , E. M. Fries , C. Cude-Woods , T. Bailey , M. Blatnik , L. J. Broussard , N. B. Callahan , J. H. Choi
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S. M. Clayton S. A. Currie M. Dawid E. B. Dees B. W. Filippone W. Fox P. Geltenbort E. George L. Hayen K. P. Hickerson M. A. Hoffbauer K. Hoffman A. T. Holley T. M. Ito A. Komives C.-Y. Liu M. Makela C. L. Morris R. Musedinovic C. O'Shaughnessy R. W. Pattie Jr. J. Ramsey D. J. Salvat A. Saunders E. I. Sharapov S. Slutsky V. Su X. Sun C. Swank Z. Tang W. Uhrich J. Vanderwerp P. Walstrom Z. Wang W. Wei A. R. Young
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We report an improved measurement of the free neutron lifetime $\tau_{n}$ using the UCN$\tau$ apparatus at the Los Alamos Neutron Science Center. We counted a total of approximately $38\times10^{6}$ surviving ultracold neutrons (UCN) after storing in UCN$\tau$'s magneto-gravitational trap over two data acquisition campaigns in 2017 and 2018. We extract $\tau_{n}$ from three blinded, independent analyses by both pairing long and short storage-time runs to find a set of replicate $\tau_{n}$ measurements and by performing a global likelihood fit to all data while self-consistently incorporating the $\beta$-decay lifetime. Both techniques achieve consistent results and find a value $\tau_{n}=877.75\pm0.28_{\text{ stat}}+0.22/-0.16_{\text{ syst}}$~s. With this sensitivity, neutron lifetime experiments now directly address the impact of recent refinements in our understanding of the standard model for neutron decay.

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