Measurements of ultracold neutron upscattering and absorption in polyethylene and vanadium

E. I. Sharapov; C. L. Morris; M. Makela; A. Saunders; Evan R. Adamek; Y. Bagdasarova; L. J. Broussard; C. B. Cude-Woods; Deion E. Fellers; Peter Geltenbort; S. I. Hasan; K. P. Hickerson; G. Hogan; A. T. Holley; Chen Yu Liu; M. P. Mendenhall; J. Ortiz; R. W. Pattie; D. G. Phillips; J. Ramsey; D. J. Salvat; S. J. Seestrom; E. Shaw; S. K.L. Sjue; W. E. Sondheim; B. Vorndick; Z. Wang; T. L. Womack; A. R. Young; B. A. Zeck

doi:10.1103/PhysRevC.88.037601

Measurements of ultracold neutron upscattering and absorption in polyethylene and vanadium

E. I. Sharapov, C. L. Morris, M. Makela, A. Saunders, Evan R. Adamek, Y. Bagdasarova, L. J. Broussard, C. B. Cude-Woods, Deion E. Fellers, Peter Geltenbort, S. I. Hasan, K. P. Hickerson, G. Hogan, A. T. Holley, Chen Yu Liu, M. P. Mendenhall, J. Ortiz, R. W. Pattie, D. G. Phillips, J. RamseyD. J. Salvat, S. J. Seestrom, E. Shaw, S. K.L. Sjue, W. E. Sondheim, B. Vorndick, Z. Wang, T. L. Womack, A. R. Young, B. A. Zeck

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Abstract

The study of neutron cross sections for elements used as efficient "absorbers" of ultracold neutrons (UCN) is crucial for many precision experiments in nuclear and particle physics, cosmology and gravity. In this context, "absorption" includes both the capture and upscattering of neutrons to the energies above the UCN energy region. The available data, especially for hydrogen, do not agree between themselves or with the theory. In this report we describe measurements performed at the Los Alamos National Laboratory UCN facility of the UCN upscattering cross sections for vanadium and for hydrogen in CH² using simultaneous measurements of the radiative capture cross sections for these elements. We measured σ_up= 1972±130 b for hydrogen in CH², which is below theoretical expectations, and σ_up=25±9 b for vanadium, in agreement with the expectation for the neutron heating by thermal excitations in solids.

Original language	English
Article number	037601
Journal	Physical Review C - Nuclear Physics
Volume	88
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.88.037601
State	Published - Sep 3 2013
Externally published	Yes

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Sharapov, E. I., Morris, C. L., Makela, M., Saunders, A., Adamek, E. R., Bagdasarova, Y., Broussard, L. J., Cude-Woods, C. B., Fellers, D. E., Geltenbort, P., Hasan, S. I., Hickerson, K. P., Hogan, G., Holley, A. T., Liu, C. Y., Mendenhall, M. P., Ortiz, J., Pattie, R. W., Phillips, D. G., ... Zeck, B. A. (2013). Measurements of ultracold neutron upscattering and absorption in polyethylene and vanadium. Physical Review C - Nuclear Physics, 88(3), Article 037601. https://doi.org/10.1103/PhysRevC.88.037601

@article{bb8187d36fac41feb57ccac59daca4ef,

title = "Measurements of ultracold neutron upscattering and absorption in polyethylene and vanadium",

abstract = "The study of neutron cross sections for elements used as efficient {"}absorbers{"} of ultracold neutrons (UCN) is crucial for many precision experiments in nuclear and particle physics, cosmology and gravity. In this context, {"}absorption{"} includes both the capture and upscattering of neutrons to the energies above the UCN energy region. The available data, especially for hydrogen, do not agree between themselves or with the theory. In this report we describe measurements performed at the Los Alamos National Laboratory UCN facility of the UCN upscattering cross sections for vanadium and for hydrogen in CH2 using simultaneous measurements of the radiative capture cross sections for these elements. We measured σup= 1972±130 b for hydrogen in CH2, which is below theoretical expectations, and σup=25±9 b for vanadium, in agreement with the expectation for the neutron heating by thermal excitations in solids.",

author = "Sharapov, {E. I.} and Morris, {C. L.} and M. Makela and A. Saunders and Adamek, {Evan R.} and Y. Bagdasarova and Broussard, {L. J.} and Cude-Woods, {C. B.} and Fellers, {Deion E.} and Peter Geltenbort and Hasan, {S. I.} and Hickerson, {K. P.} and G. Hogan and Holley, {A. T.} and Liu, {Chen Yu} and Mendenhall, {M. P.} and J. Ortiz and Pattie, {R. W.} and Phillips, {D. G.} and J. Ramsey and Salvat, {D. J.} and Seestrom, {S. J.} and E. Shaw and Sjue, {S. K.L.} and Sondheim, {W. E.} and B. Vorndick and Z. Wang and Womack, {T. L.} and Young, {A. R.} and Zeck, {B. A.}",

year = "2013",

month = sep,

day = "3",

doi = "10.1103/PhysRevC.88.037601",

language = "English",

volume = "88",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

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Sharapov, EI, Morris, CL, Makela, M, Saunders, A, Adamek, ER, Bagdasarova, Y, Broussard, LJ, Cude-Woods, CB, Fellers, DE, Geltenbort, P, Hasan, SI, Hickerson, KP, Hogan, G, Holley, AT, Liu, CY, Mendenhall, MP, Ortiz, J, Pattie, RW, Phillips, DG, Ramsey, J, Salvat, DJ, Seestrom, SJ, Shaw, E, Sjue, SKL, Sondheim, WE, Vorndick, B, Wang, Z, Womack, TL, Young, AR & Zeck, BA 2013, 'Measurements of ultracold neutron upscattering and absorption in polyethylene and vanadium', Physical Review C - Nuclear Physics, vol. 88, no. 3, 037601. https://doi.org/10.1103/PhysRevC.88.037601

TY - JOUR

T1 - Measurements of ultracold neutron upscattering and absorption in polyethylene and vanadium

AU - Sharapov, E. I.

AU - Morris, C. L.

AU - Makela, M.

AU - Saunders, A.

AU - Adamek, Evan R.

AU - Bagdasarova, Y.

AU - Broussard, L. J.

AU - Cude-Woods, C. B.

AU - Fellers, Deion E.

AU - Geltenbort, Peter

AU - Hasan, S. I.

AU - Hickerson, K. P.

AU - Hogan, G.

AU - Holley, A. T.

AU - Liu, Chen Yu

AU - Mendenhall, M. P.

AU - Ortiz, J.

AU - Pattie, R. W.

AU - Phillips, D. G.

AU - Ramsey, J.

AU - Salvat, D. J.

AU - Seestrom, S. J.

AU - Shaw, E.

AU - Sjue, S. K.L.

AU - Sondheim, W. E.

AU - Vorndick, B.

AU - Wang, Z.

AU - Womack, T. L.

AU - Young, A. R.

AU - Zeck, B. A.

PY - 2013/9/3

Y1 - 2013/9/3

N2 - The study of neutron cross sections for elements used as efficient "absorbers" of ultracold neutrons (UCN) is crucial for many precision experiments in nuclear and particle physics, cosmology and gravity. In this context, "absorption" includes both the capture and upscattering of neutrons to the energies above the UCN energy region. The available data, especially for hydrogen, do not agree between themselves or with the theory. In this report we describe measurements performed at the Los Alamos National Laboratory UCN facility of the UCN upscattering cross sections for vanadium and for hydrogen in CH2 using simultaneous measurements of the radiative capture cross sections for these elements. We measured σup= 1972±130 b for hydrogen in CH2, which is below theoretical expectations, and σup=25±9 b for vanadium, in agreement with the expectation for the neutron heating by thermal excitations in solids.

AB - The study of neutron cross sections for elements used as efficient "absorbers" of ultracold neutrons (UCN) is crucial for many precision experiments in nuclear and particle physics, cosmology and gravity. In this context, "absorption" includes both the capture and upscattering of neutrons to the energies above the UCN energy region. The available data, especially for hydrogen, do not agree between themselves or with the theory. In this report we describe measurements performed at the Los Alamos National Laboratory UCN facility of the UCN upscattering cross sections for vanadium and for hydrogen in CH2 using simultaneous measurements of the radiative capture cross sections for these elements. We measured σup= 1972±130 b for hydrogen in CH2, which is below theoretical expectations, and σup=25±9 b for vanadium, in agreement with the expectation for the neutron heating by thermal excitations in solids.

UR - http://www.scopus.com/inward/record.url?scp=84885140683&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.88.037601

DO - 10.1103/PhysRevC.88.037601

M3 - Article

AN - SCOPUS:84885140683

SN - 0556-2813

VL - 88

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 3

M1 - 037601

ER -

Measurements of ultracold neutron upscattering and absorption in polyethylene and vanadium

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