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

被引：0

作者：

Yan, H. ^{[1
]}

Baxter, D. V. ^{[1
]}

Jiang, C. Y. ^{[1
]}

Kaiser, H. ^{[1
]}

Shin, Y. C. ^{[1
]}

Snow, W. M. ^{[1
]}

Tong, X. ^{[1
]}

机构：

[1] Indiana Univ IUCF, Dept Phys, Bloomington, IN 47408 USA

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2011年 / 269卷 / 04期

基金：

美国国家科学基金会;

关键词：

Neutron moderator; Methane; Aerogel glass; Total scattering cross-section; POROUS VYCOR GLASS; NEUTRON SOURCE; SCATTERING; MODERATOR; HYDROGEN;

D O I：

10.1016/j.nimb.2010.12.035

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We report measurements of the energy dependence of the total neutron scattering cross-section of CH(4) both in bulk and confined in aerogel glass for neutron energies between similar to 0.3 and similar to 200 meV. Solid CH(4) 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). (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：425 / 430

页数：6

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