Total cross sections for ultracold neutrons scattered from gases

S. J. Seestrom et al.
Phys. Rev. C 95, 015501 – Published 30 January 2017

Abstract

We have followed up on our previous measurements of upscattering of ultracold neutrons (UCNs) from a series of gases by making measurements of total cross sections on the following gases hydrogen, ethane, methane, isobutene, n-butane, ethylene, water vapor, propane, neopentane, isopropyl alcohol, and He3. The values of these cross sections are important for estimating the loss rate of trapped neutrons due to residual gas and are relevant to neutron lifetime measurements using UCNs. The effects of the UCN velocity and path-length distributions were accounted for in the analysis using a Monte Carlo transport code. Results are compared to our previous measurements and with the known absorption cross section for He3 scaled to our UCN energy. We find that the total cross sections for the hydrocarbon gases are reasonably described by a function linear in the number of hydrogen atoms in the molecule.

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  • Received 12 July 2016

DOI:https://doi.org/10.1103/PhysRevC.95.015501

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 95, Iss. 1 — January 2017

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