Evidence for the Existence of New Unstable Elementary Particles

@article{Rochester1947EvidenceFT,
  title={Evidence for the Existence of New Unstable Elementary Particles},
  author={G. Rochester and C. C. Butler},
  journal={Nature},
  year={1947},
  volume={160},
  pages={855-857}
}
AMONG some fifty counter-controlled cloud-chamber photographs of penetrating showers which we have obtained during the past year as part of an investigation of the nature of penetrating particles occurring in cosmic ray showers under lead, there are two photographs containing forked tracks of a very striking character. These photographs have been selected from five thousand photographs taken in an effective time of operation of 1,500 hours. On the basis of the analysis given below we believe… Expand

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