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ROSSI 1939

Rossi, B.; Van Norman Hilbery, H.; Hoag, J.B.;
The Disintegration of Mesotrons
Phys. Rev. 56 (1939) 837;

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Motivation
In order to test the hypothesis of the spontaneous decay of mesotrons we have compared the absorption of the mesotron component of cosmic radiation in air and in carbon.
The mesotrons were detected by the coincidences of three Geiger-Müller tubes arranged in a vertical plane. The counters were shielded with 10 cm of lead on each side to prevent coincidences from the air showers. Also, 12.7 cm of lead was placed between the counters in order to cut off the soft component. (Extracted from the introductory part of the paper.).

Accelerator COSM Detectors CNTR

Reactions

μ± charged (neutrals)

Particles studied

	μ–	w
	μ+	w

Record comments
First evidence of muon decay and first estimation of its lifetime.

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