在球形谐振器中用声学方法测试物质的中性
Testing the neutrality of matter by acoustic means in a spherical resonator
摘要：
报道了用声学方法测试物质中性的新测量方法。该装置是基于一个球形电容器充满了气态SF $_6$由振荡电场激发。该装置已被校准测量电极化率。假设在中子的$β$衰变中电荷守恒，实验给出了电子-质子电荷差的极限为$ε_\text{p-e}\lesssim1\cdot10^{-21}$，中子的电荷也是如此。严格审查以前的测量结果，发现不正确：目前的结果是用这种技术获得的最佳限度。
英文摘要：
New measurements to test the neutrality of matter by acoustic means are reported. The apparatus is based on a spherical capacitor filled with gaseous SF$_6$ excited by an oscillating electric field. The apparatus has been calibrated measuring the electric polarizability. Assuming charge conservation in the $β$ decay of the neutron, the experiment gives a limit of $ε_\text{p-e}\lesssim1\cdot10^{-21}$ for the electron-proton charge difference, the same limit holding for the charge of the neutron. Previous measurements are critically reviewed and found incorrect: the present result is the best limit obtained with this technique.
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