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Title: Total cross sections for ultracold neutrons scattered from gases

Abstract

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.

Authors:
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  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Indiana Univ., Bloomington, IN (United States)
  3. North Carolina State Univ., Raleigh, NC (United States)
  4. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  5. Indiana Univ., Bloomington, IN (United States); Tennessee Technological Univ., Cookeville, TN (United States)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Indiana Univ., Bloomington, IN (United States)
  7. Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation)
  8. North Carolina State Univ., Raleigh, NC (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1345158
Alternate Identifier(s):
OSTI ID: 1341921
Report Number(s):
LA-UR-16-25127
Journal ID: ISSN 2469-9985; PRVCAN; TRN: US1700912
Grant/Contract Number:  
AC52-06NA25396; 2015LANLE9BU; FG02-97ER41042
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 95; Journal Issue: 1; Journal ID: ISSN 2469-9985
Publisher:
APS
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Atomic and Nuclear Physics; ultra cold neutrons; neutron lifetime

Citation Formats

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, and Zeck, Bryan Alexander. Total cross sections for ultracold neutrons scattered from gases. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.95.015501.
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. Total cross sections for ultracold neutrons scattered from gases. United States. doi:10.1103/PhysRevC.95.015501.
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, and Zeck, Bryan Alexander. Mon . "Total cross sections for ultracold neutrons scattered from gases". United States. doi:10.1103/PhysRevC.95.015501. https://www.osti.gov/servlets/purl/1345158.
@article{osti_1345158,
title = {Total cross sections for ultracold neutrons scattered from gases},
author = {Seestrom, Susan Joyce and Adamek, Evan R. and Barlow, Dave and Blatnik, Marie and Broussard, Leah J. and Callahan, Nathan B. and Clayton, Steven M. and Cude-Woods, Chris and Currie, Scott Allister and Dees, Eric B. and Fox, Walt and Hoffbauer, Mark Arles and Hickerson, Kevin P. and Holley, Adam T. and Liu, Chen -Yu and Makela, Mark F. and Medina, Jason Jerry and Morley, Deborah Jean and Morris, Christopher L. and Pattie, Jr., Robert Wayne and Ramsey, John Clinton and Roberts, Amy and Salvat, Daniel J. and Saunders, Alexander and Sharapov, Eduard I. and Sjue, Sky K. L. and Slaughter, Brad A. and Walstrom, Peter Lowell and Wang, Zhehui and Wexler, Jonathon and Womack, Todd Lane and Young, Albert R. and Vanderwerp, John and Zeck, Bryan Alexander},
abstractNote = {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.},
doi = {10.1103/PhysRevC.95.015501},
journal = {Physical Review C},
number = 1,
volume = 95,
place = {United States},
year = {2017},
month = {1}
}

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