使用非对称磁磁陷阱来填充和转储测量中子寿命

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使用非对称磁磁陷阱来填充和转储测量中子寿命

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

论文作者

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, 5 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.

论文摘要

过去二十年来，对中子寿命的较旧测量结果产生了一些新的测量和重新分析。这些导致在冷中子束中产生质子的中子衰减速率的最精确测量与中子储存实验中测量的寿命之间的最精确测量之间导致了4.4标准偏差差异。使用不同技术的测量对于研究在任何测量中是否存在未识别的系统效应很重要。在本文中，我们报告了使用Los Alamos非对称磁磁陷阱的新测量，其中使用填充和转储方法对陷阱的外部进行了存活的中子。新的测量可提供免费的中子寿命。尽管该测量并不那么精确，但它与以前使用相同设备中的原位计数的结果符合统计一致。

The past two decades have yielded several new measurements and reanalyses 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 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. The new measurement gives a free neutron lifetime of . 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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