水银盘水平基准装置

本发明提供了一种水平基准的设计方法及其装置，实现水平基准平台的设计和选定，解决了背景技术中无法实现的技术问题。本发明是利用水银在常温下为液态且密度较高浮力较大的物理性质，使浮于其上的平面反射镜表面能和水平面平行，达到了选定水平基准平面的目的。本发明具有有高精度、高可靠性、体积小、结构简单、制作安装调试方便等显而易见的优点。

方波调制实现空间测角的方法

本发明提供了一种方波调制实现空间测角的方法，旨在实现高精度、稳定测角。该方法中，线偏振光经过外加的一种具体方波磁光调制信号的磁光玻璃后，成为携带调制信号的调制偏振信号光；调制偏振信号光经过渥拉斯顿棱镜，分为两路偏振方向相互垂直的信号光Io、Ie，分别被两个探测器接收，对接收到的信号输出至信号处理电路，进行特定的优化解算，从而得出渥拉斯顿棱镜光轴与起偏器光轴之间相对初始夹角45°的偏离方位角α。本发明消除了光源波动、两路信号增益差异、调制度mf波动的影响及Wollaston棱镜出射光强非线性的影响，提高了装置实用性，使整个装置具有测角精度高、测角速度快、稳定可靠等特点

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel