Total cross sections for ultracold neutrons scattered from gases
| Autor: | T. L. Womack, Leah Broussard, Mark A. Hoffbauer, Chen-Yu Liu, Robert W. Pattie, S. J. Seestrom, B. A. Zeck, N. B. Callahan, Scott Currie, Mark Makela, D. J. Morley, E. B. Dees, J. Medina, John Ramsey, Jonathon Wexler, Brad A. Slaughter, Steven Clayton, Dave Barlow, Kevin Hickerson, Walt Fox, J. Vanderwerp, C. Cude-Woods, Evan R. Adamek, Alexander Saunders, D. J. Salvat, Amy Roberts, E. I. Sharapov, Albert Young, Adam Holley, Zhehui Wang, M. Blatnik, P. L. Walstrom, Christopher Morris, Sky Sjue |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases Hydrogen 010308 nuclear & particles physics Monte Carlo method Absorption cross section chemistry.chemical_element 01 natural sciences 7. Clean energy 3. Good health chemistry.chemical_compound Neopentane chemistry 13. Climate action Propane 0103 physical sciences Ultracold neutrons Neutron Atomic physics Physics::Chemical Physics 010306 general physics Nuclear Experiment Water vapor |
| Popis: | 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 ^3He. 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 ^3He 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. |
| Databáze: | OpenAIRE |
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