Total cross sections for ultracold neutrons scattered from gases

Seestrom, Susan Joyce; Adamek, Evan R.; Barlow, Dave; Blatnik, Marie; Broussard, Leah J.; Callahan, Nathan B.; Clayton, Steven M.; Cude-Woods, Chris; Currie, Scott Allister; Dees, Eric B.; Fox, Walt; Hoffbauer, Mark Arles; Hickerson, Kevin P.; Holley, Adam T.; Liu, Chen -Yu; Makela, Mark F.; Medina, Jason Jerry; Morley, Deborah Jean; Morris, Christopher L.; Pattie, Jr., Robert Wayne; Ramsey, John Clinton; Roberts, Amy; Salvat, Daniel J.; Saunders, Alexander; Sharapov, Eduard I.; Sjue, Sky K. L.; Slaughter, Brad A.; Walstrom, Peter Lowell; Wang, Zhehui; Wexler, Jonathon; Womack, Todd Lane; Young, Albert R.; Vanderwerp, John; Zeck, Bryan Alexander

doi:10.1103/PhysRevC.95.015501

Total cross sections for ultracold neutrons scattered from gases

Journal Article · Mon Jan 30 00:00:00 EST 2017 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.95.015501· OSTI ID:1345158

Seestrom, Susan Joyce ^[1]; Adamek, Evan R. ^[2]; Barlow, Dave ^[1]; Blatnik, Marie ^[1]; Broussard, Leah J. ^[1]; Callahan, Nathan B. ^[2]; ^[1]; Cude-Woods, Chris ^[2]; ^[1]; Dees, Eric B. ^[3]; Fox, Walt ^[2]; ^[1]; Hickerson, Kevin P. ^[4]; Holley, Adam T. ^[5]; Liu, Chen -Yu ^[2]; ^[1]; Medina, Jason Jerry ^[1]; Morley, Deborah Jean ^[1]; ^[1]; Pattie, Jr., Robert Wayne ^[1] more »

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Indiana Univ., Bloomington, IN (United States)
North Carolina State Univ., Raleigh, NC (United States)
California Inst. of Technology (CalTech), Pasadena, CA (United States)
Indiana Univ., Bloomington, IN (United States); Tennessee Technological Univ., Cookeville, TN (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Indiana Univ., Bloomington, IN (United States)
Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation)
North Carolina State Univ., Raleigh, NC (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Here, 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.

Research Organization:: Los Alamos National Laboratory (LANL)

Sponsoring Organization:: LDRD; USDOE

Grant/Contract Number:: AC52-06NA25396; FG02-97ER41042

OSTI ID:: 1345158

Alternate ID(s):: OSTI ID: 1341921

Report Number(s):: LA-UR-16-25127

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 1 Vol. 95; ISSN PRVCAN; ISSN 2469-9985

Publisher:: APSCopyright Statement

Country of Publication:: United States

Language:: English

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Measurement of the neutron lifetime using a magneto-gravitational trap and in situ detection Pattie, R. W.; Callahan, N. B.; Cude-Woods, C. Science, Vol. 360, Issue 6389 https://doi.org/10.1126/science.aan8895	journal	May 2018

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