Points from Foregoing Letters


    Absorption experiments have been mado in lead and air of the primary radiation responsible for the heavy particle component of the cosmic rays. It is shown by W. Heitler, C. F. Powell and G. E. F. Fertel that this primary radiation consists neither of electrons nor mesotrons, and it is suggested that the best working hypothesis is provided by the assumption that the heavy particles are produced by neutrons. An atomic ‘explosion’ has been observed in which one of the fragments consists of a highly charged nucleus with a very great specific ionization and showing marked effects duo to ‘capture and loss’.

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    Points from Foregoing Letters. Nature 144, 292 (1939). https://doi.org/10.1038/144292b0

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