Charge transport in liquid helium at low temperatures

被引：0

作者：

Sethumadhavan, B. ^{[1
]}

Yao, W. ^{[1
]}

Eguchi, H. ^{[1
]}

Ghosh, A. ^{[1
]}

Huang, Y. H. ^{[1
]}

Kim, Y. H. ^{[1
]}

Lanou, R. E. ^{[1
]}

Maris, H. J. ^{[1
]}

Mochamuk-Macchia, A. N. ^{[1
]}

Seidel, G. M. ^{[1
]}

机构：

[1] Brown Univ, Dept Phys, Providence, RI 02912 USA

来源：

LOW TEMPERATURE PHYSICS, PTS A AND B | 2006年 / 850卷

关键词：

superfluid helium; metastables; surface; solar neutrino;

D O I：

暂无

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In an experiment to investigate the possibility of using superfluid helium as a detection medium for low energy solar neutrinos, we have studied the currents produced by a radioactive source in a helium cell having a liquid/vacuum interface at 50 mK. A number of phenomena have been observed that appear not to have been described in the literature. These include the following: 1) The current at very low voltages in a cell having a free surface can be 100 times greater than in a filled cell. This additional current is associated with Penning ionization of metastable triplet dimers in surface states. 2) There is a large amplification of current in modest electric fields with a free surface present in the cell. This is the result of charges accelerated across the vacuum having sufficient energy to produce ionization and additional free charges upon hitting a liquid surface. The amplification becomes sufficiently large that breakdown occurs at potential differences across the vacuum of less than 1000 V. The dependence on He-3 concentration of these phenomena has been studied.

引用

页码：159 / +

页数：2

共 2 条

[1]

ADAMS J, 2000, THESIS BROWN U

[2] Detection of a single electron produced inside bulk superfluid helium [J].

Sethumadhavan, B ;

Yao, W ;

Eguchi, H ;

Huang, YH ;

Kim, YH ;

Lanou, RE ;

Maris, HJ ;

Mocharnuk-Macchia, AN ;

Seidel, GM .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2004, 520 (1-3) :142-144

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