PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Cosmic-Ray Physics (Indirect, CRI)
Carl Anderson´s 1932 upward going positron
P. Carlson
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Pre-published on: August 03, 2023
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The 1932 discovery-photo of the positron track in Carl Anderson´s cloud chamber has been shown in numerous books and articles over the years. The 63 MeV positron strangely went upwards in the chamber, a fact not much discussed over the years. In his 1961 article about the early work on the positron and muon[1] Anderson writes: ”Curiously enough, despite the strong admonitions of Dr. Millikan that upward-moving cosmic-ray particles were rare, this indeed was an example of one of those very rare upward-moving cosmic ray particles.” However, no explanation about the origin of the upward going positron has been published. In this work we discuss different positron sources and give a detailed explanation of the likely origin of Anderson´s upward going positron.
DOI: https://doi.org/10.22323/1.444.0337
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