Direct Experimental Verification of Neutron Acceleration by the Material Optical Potential of Solid H22
Altarev, I. and Atchison, F. and Daum, M. and Frei, A. and Gutsmiedl, E. and Hampel, G. and Hartmann, F.~J. and Heil, W. and Knecht, A. and Kratz, J.~
Keywords
Neutron sources, Neutron transport: diffusion and moderation
Abstract
We have measured the acceleration of neutrons by the material optical potential of solid 2H2. Using a gravitational spectrometer, we find a minimal kinetic energy Ec=(99±7)_s13_s178201_s19_s13_s178201_s19neV of neutrons from a superthermal ultracold neutron (UCN) source with solid 2H2 as an UCN converter. The result is in excellent agreement with theoretical predictions, Ec=106_s13_s178201_s19_s13_s178201_s19neV.
