Gravitational induced phase effects are investigated in neutron interferometry for testing the validity of the Newtonian potential

应在大型中子干涉仪中系统地研究对中子产生的引力相。在完美晶体干涉仪中，单个中子在宏观上被分开几厘米，并经历相移，这取决于一条路径高于另一条路径的高度。但到目前为止测得的相移大约比预期的低1%。随着引力相移随着干涉仪尺寸的增大而增大，新一代大型中子干涉仪对引力的敏感性将大大提高。我们的目标是验证宏观上分离的非常轻的亚原子量子物体的牛顿引力定律。通过精确测量硅在不同晶格反射下的相干散射长度，同样的装置将被用于传感假设的非牛顿短程相互作用。我们设置的一个特殊功能是对亚微米相互作用机制的敏感性。这还有一个额外的好处，那就是同时获得了中子-电子散射长度的精确测量。

Gravitational phases induced on the neutron shall systematically be investigated in large neutron interferometers. In the perfect crystal interferometer, a single neutron is macroscopically separated by several centimetres and experiences phase shifts depending on the height of one path above the other. But the hitherto measured phase shifts are approximately 1% lower than expected. As the gravitational phase shift increases with the interferometer size the new generation of large neutron interferometers will be much more sensitive to gravitation. Our aim is the verification of the Newtonian gravitation law for a macroscopically separated very light sub-atomar quantum object. The same setup will be exploited for sensing hypothetic non-Newtonian short-range interactions by accurately measuring the coherent scattering length of silicon in a perfect crystal at different lattice reflections. A special feature of our setup is the sensitivity to the submicron interaction regime. This has the additional benefit that simultaneously a precision measurement of the neutron-electron scattering length is obtained.