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Journal of open systems evolution problems

МОДЕЛИРОВАНИЕ ЭКСПЕРИМЕНТА ПО ИЗМЕРЕНИЮ УТЕЧКИ ПРИ РАЗ-ЛИЧНЫХ СКОРОСТЯХ UCN ПРИ ИСПОЛЬЗОВАНИИ ГРАВИТАЦИОННОЙ СПЕКТРОСКОПИИ

В.В. Несвижевский, Kylyshbek Turlybekuly, D.A. Kereibay, Е.В. Лычагин, S.K. Sakhiyev, Д.А. Керейбай, С.К. Сахиев, Д.А. Керейбай, С.К. Сахиев

Published Dec 22, 2020• 0 citations

Abstract

This work is devoted to simulation of precise experiment of loss coefficient measurement experiment at different velocities of UCN using gravitational spectroscopy and to choose optimal parameters of storage volume. The effect of various covers and materials of trap on loss coefficients preliminary was estimated. As result of simulation the size of experimentalset-up, optimal time diagram of measurements and optimal area of sample to measure loss coefficient with given accuracy were chosen. Keywords: loss coefficient, ultracold neutrons

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This work is devoted to simulation of precise experiment of loss coefficient measurement experiment at different velocities of UCN using gravitational spectroscopy and to choose optimal parameters of storage volume. The effect of various covers and materials of trap on loss coefficients preliminary was estimated. As result of simulation the size of experimentalset-up, optimal time diagram of measurements and optimal area of sample to measure loss coefficient with given accuracy were chosen. Keywords: loss coefficient, ultracold neutrons

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(Received July 14, 2013)Ultracold neutrons (UCNs) have very low kinetic energy, therefore they can be bound by terrestrialgravity above a reﬂecting mirror. The wave function of the bound state has a characteristic modu-lation. We developed a novel technique of magnifying the UCN distribution using a cylindrical rodas a convex mirror to overcome the current neutron detector resolution of several microns. The ob-served modulation is in good agreement with the prediction. The detector resolution is estimatedto be 0:7 m. This is the ﬁrst observation of gravitationally bound states of UCNs with submicronspatial resolution.

Modeling of ultracold neutron motion within the UCN

\tau

magneto-gravitational trap

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Spin Dynamics in the UCN

\tau

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Further improvement in the accuracy of any neutron lifetime experiment by means of ultracold neutrons (UCN) in material bottles is limited due to unavoidable systematic effects when the UCN are reflected from the walls. However, such effects can be excluded in principle if magnetic trapping of UCN is used. The storage of UCN in a small magnetic trap made of permanent magnets was demonstrated for the first time ever. The measured storage time in this feasibility study was (882 ± 16) s. At this level of accuracy no depolarization was observed.