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Published May 1, 1950 | Published
Journal Article Open

Cloud-Chamber Observations of the New Unstable Cosmic-Ray Particles


Thirty-four "forked tracks" similar to two previously reported by Rochester and Butler have been observed in 11,000 cloud-chamber photographs of cosmic-ray penetrating showers, confirming their conclusion that new unstable neutral and charged particles exist. The lifetime of the neutral particles is found to be about 3×10^-10 sec., and some information as to the nature of the decay products is given.

Additional Information

© 1950 The American Physical Society Received 6 March 1950 It is a pleasure to acknowledge the assistance given by the Naval Ordnance Test Station, China Lake, California in the use of their facilities on White Mountain. Supported in part by the joint program of the ONR and the AEC.

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