Neutron radiography of helium II

被引：3

作者：

Hayden, ME

Archibald, G

Barnes, PD

Buttler, WT

Clark, DJ

Cooper, MD

Espy, M

Greene, GL

Golub, R

Lamoreaux, SK

Lei, C

Marek, LJ

Peng, JC

Penttila, S

机构：

[1] Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada

[2] Los Alamos Natl Lab, Div Phys, Los Alamos, NM 87545 USA

[3] Hahn Meitner Inst Berlin GmbH, D-14109 Berlin, Germany

[4] Univ Illinois, Urbana, IL 61801 USA

来源：

PHYSICA B-CONDENSED MATTER | 2003年 / 329卷

关键词：

superfluidity; diffusion; He-3-He-4; mixtures; neutron radiography; helium vapour compression (HEVAC) effect;

D O I：

10.1016/S0921-4526(02)01974-9

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have used a neutron radiography technique to investigate the spatial distribution of He-3 atoms in very dilute liquid He-3-He-4 mixtures at temperatures below the superfluid transition temperature. By imposing heat currents and monitoring the subsequent redistribution of He-3 within the sample volume we obtain a direct measurement of the relevant mass diffusion coefficient. Data from these experiments provides a striking demonstration of the manner in which the distribution of impurity atoms within the liquid can be influenced by the presence of a free surface. (C) 2003 Elsevier Science B.V. All rights reserved.

引用

页码：236 / 237

页数：2

共 7 条

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[2]

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