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Evidence for a Primary Cosmic-Ray Particle with Energy 10 20 eV

berger, M. T. Grisaru, S. W. MacDowell, and D. Y. Wong, Phys. Rev. 120, 2250 (1960). Other methods of calculating phase shifts in terms of scalar and vector particle exchanges have been considered by a number of authors. See, for example, R. Bryan, C. Dismukes, and W. Ramsay (to be published). 3R. Blankenbecler and M. L. Goldberger, Phys. Rev. 126, 766 (1962); G. F. Chew and S. C. Frautschi, Phys. Rev. Letters 7, 394 (1961); S. Frautschi, M. Gell-Mann, and F. Zachariasen, Phys. Rev. 126, 2204 (1962); D. Wong, Phys. Rev. 126, 1220 (1962). 4H. Stapp (private communication). 5M. Hull, K. Lassila, H. Ruppel, F. McDonald, and G. Breit, Phys. Rev. 122, 1606 (1961). 6C. de Vries, R. Hofstadter, and R. Herman, Phys. Rev. Letters 8, 381 (1962). 7J. Ball and D. Wong (to be published). EVIDENCE FOR A PRIMARY COSMIC-RAY PARTICLE WITH ENERGY 1020 eVt John Linsley Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts (Received 10 January 1963) Analysis of a cosmic-ray air shower recorded at the MIT Volcano Ranch station in February 1962 indicates that the total number of particles in the shower (Serial No. 2-4834) was 5 x 10'0. The total energy http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review Letters American Physical Society (APS)

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