New gravitational experiment with ultracold neutrons

Spectroscopy of ultracold neutrons diffracted by a moving grating

“…It can be shown that the condition of the smallness of their contribution is the relation χ 1 4q 2 0z , which is valid with the reasonable accuracy in the experiments [35][36][37]. As a result, we obtain the following system of reduced differential equations of the first order:…”

“…As in [28,29,[35][36][37] The grating was examined using an atomic force microscope. Two fragments of the grating positioned at different distances from the center were scanned.…”

“…The nonstationary phenomenon of neutron diffraction by a moving grating has found its application in the experiments testing the weak equivalence principle for the neutron [35].…”

“…Unfortunately, the gravity spectrometry with interference filters used in Refs. [28,29,[35][36][37] has proved to be inadequate for the problem because it makes it possible to observe only ±1 diffraction orders.…”

Direct observation limits on antimatter gravitation

“…First, there are experiments that drop, throw, or (gravitationally or otherwise) deflect different types of matter and measure the resulting paths or forces [3] [4] [5] [6] [7]. These can be considered to be "direct" measurements, since they address the quantity (force or acceleration) in which we are specifically interested, and depend on no framework (other than that needed to arrive at the force or acceleration results themselves) to interpret their data.…”