The Heavy Nuclei of the Primary Cosmic Radiation

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Abstract

The flux of primary cosmic-ray nuclei, heavier than protons, was determined at geomagnetic latitudes $\ensuremath{\lambda}=55\ifmmode^\circ\else\textdegree\fi{}$ and $\ensuremath{\lambda}=30\ifmmode^\circ\else\textdegree\fi{}$ \ifmmode^\circ\else\textdegree\fi{}N. It is shown that at $\ensuremath{\lambda}=30\ifmmode^\circ\else\textdegree\fi{}$ at least one-half of the incident nucleons and a significant fraction of the incident cosmic-ray energy is due to the heavy component.The distribution of atomic numbers among the primaries was determined at both latitudes; the relative magnitude of the fluxes of the nuclei H:He:C,N,O: (nuclei of charge $Z>10$ is given approximately by the ratio 4000:1000:35:10.The possible significance of these results for the theories on the origin of cosmic rays is discussed.

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