中子的永久电偶极矩的测量

论文标题

中子的永久电偶极矩的测量

Measurement of the permanent electric dipole moment of the neutron

论文作者

Abel, C., Afach, S., Ayres, N. J., Baker, C. A., Ban, G., Bison, G., Bodek, K., Bondar, V., Burghoff, M., Chanel, E., Chowdhuri, Z., Chiu, P. -J., Clement, B., Crawford, C. B., Daum, M., Emmenegger, S., Ferraris-Bouchez, L., Fertl, M., Flaux, P., Franke, B., Fratangelo, A., Geltenbort, P., Green, K., Griffith, W. C., van der Grinten, M., Grujić, Z. D., Harris, P. G., Hayen, L., Heil, W., Henneck, R., Hélaine, V., Hild, N., Hodge, Z., Horras, M., Iaydjiev, P., Ivanov, S. N., Kasprzak, M., Kermaidic, Y., Kirch, K., Knecht, A., Knowles, P., Koch, H. -C., Koss, P. A., Komposch, S., Kozela, A., Kraft, A., Krempel, J., Kuźniak, M., Lauss, B., Lefort, T., Lemière, Y., Leredde, A., Mohanmurthy, P., Mtchedlishvili, A., Musgrave, M., Naviliat-Cuncic, O., Pais, D., Piegsa, F. M., Pierre, E., Pignol, G., Plonka-Spehr, C., Prashanth, P. N., Quéméner, G., Rawlik, M., Rebreyend, D., Rienäcker, I., Ries, D., Roccia, S., Rogel, G., Rozpedzik, D., Schnabel, A., Schmidt-Wellenburg, P., Severijns, N., Shiers, D., Dinani, R. Tavakoli, Thorne, J. A., Virot, R., Voigt, J., Weis, A., Wursten, E., Wyszynski, G., Zejma, J., Zenner, J., Zsigmond, G.

论文摘要

我们提出了一个实验，以使用拉姆齐（Ramsey）用超电压中子（UCN）分离振动磁场的方法来测量保罗·施雷尔学院（Paul Scherrer Institute）中子的电偶极矩（EDM）。我们的测量位于EDM实验的悠久历史中，探测物理违反时间逆转的不变性。该实验的显着特征是使用HG-199 comagnetomer和一系列光学泵送的肝蒸气磁力计取消并校正磁场变化。统计分析是通过两个单独的组在盲目的数据集上进行的，而从前所未有的磁场知识中获得了系统效应的估计。中子EDM的测量值为$ d _ {\ rm n} =（0.0 \ pm1.1 _ {\ rm Stat} \ pm0.2 _ {\ rm sys}）\ times10^{ - 26} e \，{\ rm cm cm cm} $。

We present the result of an experiment to measure the electric dipole moment (EDM) of the neutron at the Paul Scherrer Institute using Ramsey's method of separated oscillating magnetic fields with ultracold neutrons (UCN). Our measurement stands in the long history of EDM experiments probing physics violating time reversal invariance. The salient features of this experiment were the use of a Hg-199 co-magnetometer and an array of optically pumped cesium vapor magnetometers to cancel and correct for magnetic field changes. The statistical analysis was performed on blinded datasets by two separate groups while the estimation of systematic effects profited from an unprecedented knowledge of the magnetic field. The measured value of the neutron EDM is $d_{\rm n} = (0.0\pm1.1_{\rm stat}\pm0.2_{\rm sys})\times10^{-26}e\,{\rm cm}$.

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