Polarized ultra-cold neutrons in the next generation measurement of the neutron EDM

寻找自由中子的非零电偶极矩的实际精度达到了10-26 ecm数量级的极限。与过去的实验类似，所有即将进行的新实验都是在寻找极化超冷中子在一定的磁场和电场条件下储存和进动后中子自旋方向的变化。因此，为了提高灵敏度，FRMII的下一代nEDM实验需要对其每个子部件进行改进，这将接近可行性的极限。该项目的三个最终目标是将100%极化的超冷中子送入nEDM进动室，分析指定进动时间后的中子自旋，以及实施一种独特的工具来研究超过10-27ecm水平的几何相位效应。

The actual accuracy in the search for a non zero electric dipole moment of the free neutron reached a limit of the order of 10-26 ecm. Similar to past experiments, all new upcoming experiments are looking for a change in the neutron spin direction after the storage and precession of polarized ultracold neutrons under certain magnetic and electric field conditions. Therefore, in order to increase the sensitivity, the next generation nEDM experiment at the FRMII requires improvements in each of its subparts, which will come close to the limit of feasibility. The three final goals of the proposed project will be the delivery of 100% polarized of ultracold neutrons into the nEDM precession chambers, the analysis of the neutron spin after a defined precession time and the implementation of a unique tool to investigate geometric phase effects beyond the level of 10-27ecm.