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

arXiv - PHYS - Nuclear Experiment Pub Date : 2024-09-09 DOI:arxiv-2409.05560

R. MusedinovicNorth Carolina State University, L. S. BloklandIndiana University, Bloomington, C. B. Cude-WoodsLos Alamos National Laboratory, M. SinghLos Alamos National Laboratory, M. A. BlatnikLos Alamos National LaboratoryKellogg Radiation Laboratory, California Institute of Technology, N. CallahanArgonne National Laboratory, J. H. ChoiNorth Carolina State University, S. ClaytonLos Alamos National Laboratory, B. W. FilipponeKellogg Radiation Laboratory, California Institute of Technology, W. R. FoxIndiana University, Bloomington, E. FriesKellogg Radiation Laboratory, California Institute of Technology, P. GeltenbortInstitut Laue-Langevin, F. M. GonzalezOak Ridge National Laboratory, L. HayenNorth Carolina State University, K. P. HickersonKellogg Radiation Laboratory, California Institute of Technology, A. T. HolleyTennessee Technological University, T. M. ItoLos Alamos National Laboratory, A. KomivesDePauw University, S LinLos Alamos National Laboratory, Chen-Yu LiuUniversity of Illinois, M. F. MakelaLos Alamos National Laboratory, C. M. O'ShaughnessyLos Alamos National Laboratory, R. W. Pattie JrEast Tennessee State University, J. C. RamseyOak Ridge National Laboratory, D. J. SalvatIndiana University, Bloomington, A. SaundersOak Ridge National Laboratory, S. J. SeestromLos Alamos National Laboratory, E. I. SharapovJoint Institute for Nuclear Research, Z. TangLos Alamos National Laboratory, F. W. UhrichLos Alamos National Laboratory, J. VanderwerpIndiana University, Bloomington, P. WalstromLos Alamos National Laboratory, Z. WangLos Alamos National Laboratory, A. R. YoungNorth Carolina State UniversityTriangle Universities Nuclear Laboratory, C. L. MorrisLos Alamos National Laboratory

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Abstract

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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利用原位探测测量磁引力陷阱中自由中子的寿命

我们在此公布在洛斯阿拉莫斯中子科学中心的洛斯阿拉莫斯超冷中子设施进行的 UCNtau 实验的三年数据。这些数据是对我们之前公布的数据的补充。本文的目标是更好地理解和量化系统不确定性，并提高寿命统计精度。我们报告了2020-2022年这些运行的中子寿命的测量值877.94+/-0.37秒；在对UCNtau的所有数据进行平均后，我们报告了更新的寿命值877.82+/-0.22（统计）+0.20-0.17（系统）秒。我们使用了改进的监测探测器，减少了由于 UCN 在环境气体中的上散射而造成的校正，并采用了四种不同的主要 UCN 探测器几何结构，以减少速率依赖性所需的校正，并探索相空间演化可能造成的贡献。

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arXiv - PHYS - Nuclear Experiment

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