Experiments on the Electric Dipole Moment and Parity Non- Conserving Spin Rotations of the Neutron (Physics)

这项拟议的研究旨在将中子电偶极矩中的电流不确定度降低到原来的十分之一。这一基本重要的测量将为时间反转对称性破坏提供一种测试，并有助于区分CP破坏的理论。还将通过测量极化目标散射中的中子自旋旋转来研究宇称不守恒和时间反转对称性破坏。此外，还将通过测量自旋极化的中子在液体仲氢上的散射来确定中子-质子弱相互作用的耦合强度。这些实验将使用格勒诺布尔的ILL反应堆中的中子进行，是以前NSF拨款资助的工作的继续。

The proposed research is aimed at reducing, by a factor of ten, the current uncertainty in the neutron electric dipole moment. This fundamentally important measurement will provide a test for time reversal symmetry violation, and should help differentiate among theories of CP violation. Parity non-conservation and time reversal symmetry violation will also be studied through measurements of neutron spin rotation in scattering from polarized targets. In addition, the neutron-proton weak interaction coupling strength will be determined through measurements of the scattering of spin- polarized neutrons on liquid para-hydrogen. These experiments will be carried out using neutrons from the ILL reactor at Grenoble, and are a continuation of work funded under previous NSF grants.