Online ISSN: 1884-4111 Print ISSN: 0033-8303
Radioisotopes 72(3): 281-292 (2023)


拡散霧箱中のアルファ線の通過方向と反対の方向に延びる飛跡についてOn the Track Extending in the Opposite Direction to the Passage of an Alpha-Particle in Diffusion Cloud Chamber

1名古屋大学Nagoya University

2仮説実験授業研究会Association for Studies in Hypothesis-experiment Class

受付日:2022年12月17日Received: December 17, 2022
受理日:2023年9月11日Accepted: September 11, 2023
発行日:2023年11月15日Published: November 15, 2023


Diffusion cloud chamber shows some mysterious phenomena. Although α-particles pass their whole length of the passage within 10 ns, the extension of the tracks are visible. Also, an incredible phenomenon was found that the tracks extended in the opposite direction to the passage of α-particles. The reason of the latter one was confirmed experimentally and theoretically that the temperature difference existed along the passage of α-particle and the density of the excess supersaturated molecules of ethanol near the end of the passage of α-particle was a few times larger than that near the beginning of the passage.

Key words: diffusion cloud chamber; alpha-particle; track; opposite direction; temperature distribution

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