학술논문
Proof-of-principle Experiment of 4He Excimer Cluster Generation via Neutron-3He Absorption Reaction for Visualization of Velocity Fields in Superfluid 4He / 超流動4He中の流れ場可視化にむけた中性子3He吸収反応による4He励起分子集団生成の実証
Document Type
Journal Article
Author
D. Ito; H. Hayashida; H. Tomita; H.M. Shimizu; K. Hiroi; K. Hirota; M. Hishida; M. Kitaguchi; N. Wada; S. Suzuki; S. Waki; T. Iguchi; T. Maruyama; T. Matsushita; T. Shinohara; V. Sonnenschein; Volker Sonnenschein; W. Guo; Wei Guo; Y. Kiyanagi; Y. Saito; Y. Tsuji; 丸山 巧; 井口 哲夫; 伊藤 大介; 北口 雅暁; 和田 信雄; 富田 英生; 広田 克也; 廣井 孝介; 松下 琢; 林田 洋寿; 清水 裕彦; 篠原 武尚; 脇 慎一郎; 菱田 真由; 辻 義之; 鈴木 颯; 鬼柳 善明; 齊藤 泰司
Source
波紋 / hamon. 2020, 30(4):192
Subject
Language
Japanese
ISSN
1349-046X
1884-636X
1884-636X
Abstract
For visualization of flows in superfluid 4He, an excited helium molecule (excimer) 4He2* is an ideally suitable flow tracer, because it has a molecular size with a minimum influence to flow, and follows only normal-component flow around 1K but only vortices below 0.5 K. However, to visualize flow fields in 3D, small clouds (clusters) of 4He2* are required, whose generation method has not been established. To generate such clusters, we proposed the use of neutron-3He absorption reaction. In the proof-of-principle experiments, we have confirmed the 4He2* generation, while the detail of clusters still remains undetermined. The concept, methods, progress, and present status are shown.