Problem of the storage of ultracold neutrons at aperiodic pulsed neutron sources. Simulation of nonstationary storage of ultracold neutrons in neutron guides with an exit end reflector

摘要

The results are presented of a Monte-Carlo simulation of nonstationary transport and storage of ultracold neutrons (UCN) in curved vertical and horizontal neutron guides of rectangular cross section with a reflector at the exit end. Included were neutron losses due to capture and diffuse neutron scattering by imperfectly smooth reflecting guide wall surfaces. It is shown that a significant part of UCN, reaching the end section of the neutron guide (30-50%) may be trapped in a small volume 1-2 l. 3 refs., 6 figs. (Atomindex citation 27:038827)