2019年7月15日
Generation of 4 He 2∗ Clusters via Neutron- 3 He Absorption Reaction Toward Visualization of Full Velocity Field in Quantum Turbulence
Journal of Low Temperature Physics
- 巻
- 196
- 号
- 1-2
- 開始ページ
- 275
- 終了ページ
- 282
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1007/s10909-018-02112-3
For flow visualization study of quantum turbulence in superfluid He, He2∗ excimers are unique tracers which follow only normal-fluid component flow above 1 K. To generate detectable small He2∗ clouds (clusters) required for full-space velocity field measurements, we have adopted a new method based on neutron absorption reaction of He impurities in He and conducted proof-of-principle experiments. Generation of the He2∗ excimers was detected by laser-induced fluorescence using photomultiplier tubes. The fluorescence was observed to increase proportionally to the neutron flux, suggesting that a sufficient amount of He2∗ excimers were generated by neutrons. We also estimated the number of He2∗ excimers possibly generated by γ-rays and found that the relevant contribution was less than 40%. Thus, the majority of the He2∗ excimers was confirmed to be generated via n- He absorption reactions. 4 3 4 3
- リンク情報
- ID情報
-
- DOI : 10.1007/s10909-018-02112-3
- ISSN : 0022-2291
- eISSN : 1573-7357
- SCOPUS ID : 85058447197