| Issue |
Europhys. Lett.
Volume 63, Number 5, September 2003
|
|
|---|---|---|
| Page(s) | 687 - 693 | |
| Section | Nuclear Physics | |
| DOI | https://doi.org/10.1209/epl/i2003-00576-1 | |
| Published online | 01 November 2003 | |
Extraction of radioactive positive ions across the surface of superfluid helium: A new method to produce cold radioactive nuclear beams
1
Department of Physics, PB 35 (YFL), University of Jyväskylä - FIN-40014, Finland
2
Institute of Modern Physics, Chinese Academy of Sciences - Lanzhou 730000, PRC
3
KVI - Zernikelaan 25, 9747 AA Groningen, The Netherlands
4
Ørsted Laboratory, Niels Bohr Institute - Universitetsparken 5 DK-2100 Copenhagen, Denmark
5
Osaka Gakuin University - Suita/Osaka, 564-8511, Japan
Corresponding author: huangwx@impcas.ac.cn
Received:
23
April
2003
Accepted:
20
June
2003
Alpha-decay recoils 
were stopped in superfluid
helium and positive ions were extracted by electric field into
the vapour phase. This first quantitative observation of
extraction was successfully conducted using highly sensitive
radioactivity detection. The efficiency for extraction across the
liquid surface was 
at 1.60
, the release time was
at 1.50 and the barrier for positive ions
through a free superfluid-helium surface was 
.
The pulsed second sound proved to be effective in enhancing the
extraction.
PACS: 29.90.+r – Other topics in elementary-particle and nuclear physics experimental methods and instrumentation / 67.40.Jg – Ions in liquid 
/ 29.27.Ac – Beam injection and extraction
© EDP Sciences, 2003
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