RUI: Neutron Interferometry

Drs。伯恩斯坦和霍恩提议研究中子干涉和衍射。这些研究包括开发新的物质敏感探针和研究基本量子现象。该项目延续了与麻省理工学院Shull教授的十年合作，该合作在中子干涉测量学的发展中发挥了核心作用。作为探针，晶体中的中子比自由空间中的中子对扰动影响更敏感。有效的质量增强和一种新的共振现象都将被利用。当晶体内中子受到适当大小的均匀磁场时，就会发生这种新的共振。他们将研究有效质量增强的可能改进，两种效应的可能组合，它们在寻找其他中子特性方面的应用，例如，电偶极矩，以及使用铁电晶体衍射获得更高灵敏度的可能性。在理论方面，他们还期望研究引力等效原理应用的改进，菲索效应（运动介质中的相移）的描述以及与一维狄拉克方程的精确类比。实验测试将在格勒诺布尔安装的设施中进行，如果可能的话，还将在计划中的NBS冷中子源中进行。干涉测量的这项工作导致了基本的量子原理和效应。在这里，他们打算研究一个新发现的系统，它违反了贝尔不等式，但像最初的EPR实验一样，不涉及自旋。他们还将继续他们的相干研究，包括中子波包的性质和精确自旋旋转对称性的研究。

Drs. Bernstein and Horne propose to investigate neutron interferometry and diffraction. These investigations include development of new sensitive probes of matter and study of fundamental quantum phenomena. This project continues the ten year collaboration with Professor Shull at MIT, a collaboration that has played a central role in the development of neutron interferometry. As a probe, neutrons in crystals are more sensitive to perturbing influences than in free space. Both the effective mass enhancement and that of a new resonance phenomenon will be exploited. This new resonance occurs when in-crystal neutrons are subject to a homogeneous magnetic field of the proper magnitude. They will study possible improvements in the effective mass enhancements, possible combinations of the two effects, their application to search for other neutron properties, e.g., the electric dipole moment, and the possibility of using ferroelectric crystal diffraction for even greater sensitivity. On the theoretical side, they also expect to investigate refinements in the application of the gravitational equivalence principle, the description of the Fizeau effect (phase shift in a moving medium) and an exact analogy to the one- dimensional Dirac equation. Experimental tests will be performed at a facility being installed at Grenoble and, if possible, at the planned NBS cold neutron source. This work on interferometry leads to fundamental quantum principles and effects. Here they intend to pursue a newly discovered system that violates Bell's inequality but, like the original EPR experiment, does not involve spin. They will also continue their coherence studies including the nature of neutron wave-packets and investigations of exact spin rotation symmetry.