Total cross sections for ultracold neutrons scattered from gases

S. J. Seestrom; E. R. Adamek; D. Barlow; M. Blatnik; L. J. Broussard; N. B. Callahan; S. M. Clayton; C. Cude-Woods; S. Currie; E. B. Dees; W. Fox; M. Hoffbauer; K. P. Hickerson; A. T. Holley; C. Y. Liu; M. Makela; J. Medina; D. J. Morley; C. L. Morris; R. W. Pattie; J. Ramsey; A. Roberts; D. J. Salvat; A. Saunders; E. I. Sharapov; S. K.L. Sjue; B. A. Slaughter; P. L. Walstrom; Z. Wang; J. Wexler; T. L. Womack; A. R. Young; J. Vanderwerp; B. A. Zeck

doi:10.1103/PhysRevC.95.015501

Total cross sections for ultracold neutrons scattered from gases

S. J. Seestrom, E. R. Adamek, D. Barlow, M. Blatnik, L. J. Broussard, N. B. Callahan, S. M. Clayton, C. Cude-Woods, S. Currie, E. B. Dees, W. Fox, M. Hoffbauer, K. P. Hickerson, A. T. Holley, C. Y. Liu, M. Makela, J. Medina, D. J. Morley, C. L. Morris, R. W. PattieJ. Ramsey, A. Roberts, D. J. Salvat, A. Saunders, E. I. Sharapov, S. K.L. Sjue, B. A. Slaughter, P. L. Walstrom, Z. Wang, J. Wexler, T. L. Womack, A. R. Young, J. Vanderwerp, B. A. Zeck

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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.

Original language	English
Article number	015501
Journal	Physical Review C
Volume	95
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.95.015501
State	Published - Jan 30 2017
Externally published	Yes

Funding

This material is supported by the LANL LDRD program, the U.S. Department of Energy Office of Science, Office of Nuclear Physics through LANL DOE Grant No. 2015LANLE9BU and North Carolina State University Grant No. DE-FG02-97ER41042, the U.S. National Science Foundation through Indiana University Grants No. PHY-0969490 and No. PHY-1068712, and North Carolina State University grant NSF Grant No. 1307426.

Funders	Funder number
LANL LDRD
National Science Foundation
U.S. Department of Energy	2015LANLE9BU
Directorate for Mathematical and Physical Sciences	1307426
Indiana University	PHY-0969490, PHY-1068712
North Carolina State University	DE-FG02-97ER41042

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Seestrom, S. J., Adamek, E. R., Barlow, D., Blatnik, M., Broussard, L. J., Callahan, N. B., Clayton, S. M., Cude-Woods, C., Currie, S., Dees, E. B., Fox, W., Hoffbauer, M., Hickerson, K. P., Holley, A. T., Liu, C. Y., Makela, M., Medina, J., Morley, D. J., Morris, C. L., ... Zeck, B. A. (2017). Total cross sections for ultracold neutrons scattered from gases. Physical Review C, 95(1), Article 015501. https://doi.org/10.1103/PhysRevC.95.015501

@article{5888c356463a45bba99444a136a5e1f5,

title = "Total cross sections for ultracold neutrons scattered from gases",

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.",

author = "Seestrom, {S. J.} and Adamek, {E. R.} and D. Barlow and M. Blatnik and Broussard, {L. J.} and Callahan, {N. B.} and Clayton, {S. M.} and C. Cude-Woods and S. Currie and Dees, {E. B.} and W. Fox and M. Hoffbauer and Hickerson, {K. P.} and Holley, {A. T.} and Liu, {C. Y.} and M. Makela and J. Medina and Morley, {D. J.} and Morris, {C. L.} and Pattie, {R. W.} and J. Ramsey and A. Roberts and Salvat, {D. J.} and A. Saunders and Sharapov, {E. I.} and Sjue, {S. K.L.} and Slaughter, {B. A.} and Walstrom, {P. L.} and Z. Wang and J. Wexler and Womack, {T. L.} and Young, {A. R.} and J. Vanderwerp and Zeck, {B. A.}",

note = "Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

year = "2017",

month = jan,

day = "30",

doi = "10.1103/PhysRevC.95.015501",

language = "English",

volume = "95",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

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Seestrom, SJ, Adamek, ER, Barlow, D, Blatnik, M, Broussard, LJ, Callahan, NB, Clayton, SM, Cude-Woods, C, Currie, S, Dees, EB, Fox, W, Hoffbauer, M, Hickerson, KP, Holley, AT, Liu, CY, Makela, M, Medina, J, Morley, DJ, Morris, CL, Pattie, RW, Ramsey, J, Roberts, A, Salvat, DJ, Saunders, A, Sharapov, EI, Sjue, SKL, Slaughter, BA, Walstrom, PL, Wang, Z, Wexler, J, Womack, TL, Young, AR, Vanderwerp, J & Zeck, BA 2017, 'Total cross sections for ultracold neutrons scattered from gases', Physical Review C, vol. 95, no. 1, 015501. https://doi.org/10.1103/PhysRevC.95.015501

TY - JOUR

T1 - Total cross sections for ultracold neutrons scattered from gases

AU - Seestrom, S. J.

AU - Adamek, E. R.

AU - Barlow, D.

AU - Blatnik, M.

AU - Broussard, L. J.

AU - Callahan, N. B.

AU - Clayton, S. M.

AU - Cude-Woods, C.

AU - Currie, S.

AU - Dees, E. B.

AU - Fox, W.

AU - Hoffbauer, M.

AU - Hickerson, K. P.

AU - Holley, A. T.

AU - Liu, C. Y.

AU - Makela, M.

AU - Medina, J.

AU - Morley, D. J.

AU - Morris, C. L.

AU - Pattie, R. W.

AU - Ramsey, J.

AU - Roberts, A.

AU - Salvat, D. J.

AU - Saunders, A.

AU - Sharapov, E. I.

AU - Sjue, S. K.L.

AU - Slaughter, B. A.

AU - Walstrom, P. L.

AU - Wang, Z.

AU - Wexler, J.

AU - Womack, T. L.

AU - Young, A. R.

AU - Vanderwerp, J.

AU - Zeck, B. A.

PY - 2017/1/30

Y1 - 2017/1/30

N2 - 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.

AB - 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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U2 - 10.1103/PhysRevC.95.015501

DO - 10.1103/PhysRevC.95.015501

M3 - Article

AN - SCOPUS:85015237844

SN - 2469-9985

VL - 95

JO - Physical Review C

JF - Physical Review C

IS - 1

M1 - 015501

ER -

Total cross sections for ultracold neutrons scattered from gases

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