A measurement of the change of the energy dependence of the total cross-section of phase II solid methane from confinement in aerogel glass

H. Yan; D. V. Baxter; C. Y. Jiang; H. Kaiser; Y. C. Shin; W. M. Snow; X. Tong

doi:10.1016/j.nimb.2010.12.035

A measurement of the change of the energy dependence of the total cross-section of phase II solid methane from confinement in aerogel glass

H. Yan, D. V. Baxter, C. Y. Jiang, H. Kaiser, Y. C. Shin, W. M. Snow, X. Tong

Neutron Optics & Polarization

Research output: Contribution to journal › Article › peer-review

Abstract

We report measurements of the energy dependence of the total neutron scattering cross-section of CH4 both in bulk and confined in aerogel glass for neutron energies between ∼0.3and ∼200 meV. Solid CH4 in phase II is an effective slow neutron moderation medium. Aerogel glass is one example of a broad class of disordered porous media with a large internal surface area. Many disordered materials possess excess low energy modes which have been seen in neutron scattering, and it is known that the confinement of materials inside porous media can produce modifications of the thermodynamic and excitation properties large enough to influence the neutron scattering cross-section. Our measurement shows that the confinement of the methane in pores of aerogel modifies the energy dependence total cross-section relative to bulk CH ₄.

Original language	English
Pages (from-to)	425-430
Number of pages	6
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	269
Issue number	4
DOIs	https://doi.org/10.1016/j.nimb.2010.12.035
State	Published - Feb 15 2011

Funding

This work was supported through Grants from the National Science Foundation (NSF PHY-0758018 and PHY-0457219 ). We thank Paul Sokol for the loan of the cell and the refrigerator used in this measurement.

Keywords

Aerogel glass
Methane
Neutron moderator
Total scattering cross-section

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10.1016/j.nimb.2010.12.035

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Yan, H., Baxter, D. V., Jiang, C. Y., Kaiser, H., Shin, Y. C., Snow, W. M., & Tong, X. (2011). A measurement of the change of the energy dependence of the total cross-section of phase II solid methane from confinement in aerogel glass. Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, 269(4), 425-430. https://doi.org/10.1016/j.nimb.2010.12.035

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title = "A measurement of the change of the energy dependence of the total cross-section of phase II solid methane from confinement in aerogel glass",

abstract = "We report measurements of the energy dependence of the total neutron scattering cross-section of CH4 both in bulk and confined in aerogel glass for neutron energies between ∼0.3and ∼200 meV. Solid CH4 in phase II is an effective slow neutron moderation medium. Aerogel glass is one example of a broad class of disordered porous media with a large internal surface area. Many disordered materials possess excess low energy modes which have been seen in neutron scattering, and it is known that the confinement of materials inside porous media can produce modifications of the thermodynamic and excitation properties large enough to influence the neutron scattering cross-section. Our measurement shows that the confinement of the methane in pores of aerogel modifies the energy dependence total cross-section relative to bulk CH 4.",

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author = "H. Yan and Baxter, \{D. V.\} and Jiang, \{C. Y.\} and H. Kaiser and Shin, \{Y. C.\} and Snow, \{W. M.\} and X. Tong",

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Yan, H, Baxter, DV, Jiang, CY, Kaiser, H, Shin, YC, Snow, WM & Tong, X 2011, 'A measurement of the change of the energy dependence of the total cross-section of phase II solid methane from confinement in aerogel glass', Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, vol. 269, no. 4, pp. 425-430. https://doi.org/10.1016/j.nimb.2010.12.035

A measurement of the change of the energy dependence of the total cross-section of phase II solid methane from confinement in aerogel glass. / Yan, H.; Baxter, D. V.; Jiang, C. Y. et al.
In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, Vol. 269, No. 4, 15.02.2011, p. 425-430.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - A measurement of the change of the energy dependence of the total cross-section of phase II solid methane from confinement in aerogel glass

AU - Yan, H.

AU - Baxter, D. V.

AU - Jiang, C. Y.

AU - Kaiser, H.

AU - Shin, Y. C.

AU - Snow, W. M.

AU - Tong, X.

PY - 2011/2/15

Y1 - 2011/2/15

N2 - We report measurements of the energy dependence of the total neutron scattering cross-section of CH4 both in bulk and confined in aerogel glass for neutron energies between ∼0.3and ∼200 meV. Solid CH4 in phase II is an effective slow neutron moderation medium. Aerogel glass is one example of a broad class of disordered porous media with a large internal surface area. Many disordered materials possess excess low energy modes which have been seen in neutron scattering, and it is known that the confinement of materials inside porous media can produce modifications of the thermodynamic and excitation properties large enough to influence the neutron scattering cross-section. Our measurement shows that the confinement of the methane in pores of aerogel modifies the energy dependence total cross-section relative to bulk CH 4.

AB - We report measurements of the energy dependence of the total neutron scattering cross-section of CH4 both in bulk and confined in aerogel glass for neutron energies between ∼0.3and ∼200 meV. Solid CH4 in phase II is an effective slow neutron moderation medium. Aerogel glass is one example of a broad class of disordered porous media with a large internal surface area. Many disordered materials possess excess low energy modes which have been seen in neutron scattering, and it is known that the confinement of materials inside porous media can produce modifications of the thermodynamic and excitation properties large enough to influence the neutron scattering cross-section. Our measurement shows that the confinement of the methane in pores of aerogel modifies the energy dependence total cross-section relative to bulk CH 4.

KW - Aerogel glass

KW - Methane

KW - Neutron moderator

KW - Total scattering cross-section

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DO - 10.1016/j.nimb.2010.12.035

M3 - Article

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SN - 0168-583X

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JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

IS - 4

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Yan H, Baxter DV, Jiang CY, Kaiser H, Shin YC, Snow WM et al. A measurement of the change of the energy dependence of the total cross-section of phase II solid methane from confinement in aerogel glass. Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms. 2011 Feb 15;269(4):425-430. doi: 10.1016/j.nimb.2010.12.035

A measurement of the change of the energy dependence of the total cross-section of phase II solid methane from confinement in aerogel glass

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