Improved Neutron Lifetime Measurement with UCNτ
| Popis: | 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. Comment: 7 pages, 2 figures, 3 tables |
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| Popis souboru: | application/pdf |
| ISSN: | 1079-7114 0031-9007 |
| Přístupová URL adresa: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6fcde125f88c4c94021162aedd864523 https://doi.org/10.1103/physrevlett.127.162501 |
| Rights: | OPEN |
| Přírůstkové číslo: | edsair.doi.dedup.....6fcde125f88c4c94021162aedd864523 |
| Autor: | W. Fox, A. R. Young, P. Geltenbort, E. I. Sharapov, P. L. Walstrom, Christopher Morris, R. Musedinovic, mi> τ, Zhehui Wang, S. Slutsky, B. W. Filippone, N. B. Callahan, Scott Currie, T. Bailey, Steven Clayton, J. Vanderwerp, L. Hayen, Kevin Hickerson, J. H. Choi, John Michael Ramsey, K. Hoffman, Wanchun Wei, F. Gonzalez, Mark A. Hoffbauer, Takeyasu M. Ito, A. T. Holley, Mark Makela, E. George, V. Su, D.J. Salvat, R. W. Pattie, Alexander Saunders, C. Cude-Woods, M. Blatnik, Christopher O'Shaughnessy, X. Sun, Eric Fries, Leah Broussard, C.-Y. Liu, W. Uhrich, mrow, E. B. Dees, C. Swank, A. Komives, Zhaowen Tang, M. Dawid |
| Přispěvatelé: | Institut Laue-Langevin (ILL), ILL, UCNτ |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Nuclear Theory data acquisition 010308 nuclear & particles physics Center (category theory) n: decay General Physics and Astronomy semileptonic decay [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] sensitivity 01 natural sciences High Energy Physics - Experiment Standard Model Nuclear physics Pairing 0103 physical sciences Ultracold neutrons n: lifetime Neutron Sensitivity (control systems) Nuclear Experiment 010306 general physics n --> p electron antineutrino experimental results |
| Zdroj: | Phys.Rev.Lett. Phys.Rev.Lett., 2021, 127 (16), pp.162501. ⟨10.1103/PhysRevLett.127.162501⟩ |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | 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. Comment: 7 pages, 2 figures, 3 tables |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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