Heavy Primary Cosmic Radiations : Prince Albert Project

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概要

• 論文の詳細を見る

• A systematic investigation on the heavy primary cosmic radiation is made on the basis of extensive analysis of the Prince Albert Stack. The experimental methods used in nuclear emulsion work for the determination of the charge and energy of the heavy primary are critically discussed and summarized. The experimental result described here is the first, and to date the only one, to give information on the figidity spectrum of various components of heavy primaries in the low rigidity region. The general shape of the spectrum, common to all components, is found to have a broad maximum which falls around 2.2 Gv with a width of about 0.6 Gv. The flux values above the atmosphere of the various components are as follows(in units of particles / m^2・sec・sterad.):[table] The effect of solar activity on the heavy primary cosmic radiation is discussed on the basis of the observations by the present authors compared with others. Our knowledge of the chemical composition of heavy primaries and its comparison with the astrophysical data on the abundance of various elements enable us to discuss the origin of cosmic rays. The chemical composition of heavy primaries has the following remarkable features: (i)Fe group elements are overabundant as compared with their abundance in usual stars. (ii)C is overabundant in C, N and O group elements as compared with usual stars. (iii)Ne is underabundant when compared with its abundance in stars and, at the same time, the abundance of Ne is comparable to that of Mg. (iv)On the whole, it is very similar to that of planetary nebulae up to elements of Z〜14. This fact as well as the consideration about the production efficiency of the cosmic ray particles makes it very plausible to consider that the main contribution to the cosmic ray component up to Z〜14 seems to come from late-stage giant stars whereas supernovae account for the component of Z≳20.

• 理論物理学刊行会の論文

著者

• NISHIMURA J.

  Institute of Space and Astronautical Science

• YOKOI K.

  Institute of Chemical Research, Kyoto University

• Aizu H.

  Science And Engineering Research Laboratory Waseda University

• AIZU H.

  Department of Physics, Rikkyo University

• FUJIMOTO Y.

  Institute for Nuclear Study, University of Tokyo

• HASEGAWA S.

  Institute for Nuclear Study, University of Tokyo

• KOSHIBA M.

  University of Chicago

• MITO I.

  Department of Physics, Konan University

• Mito I.

  Department Of Physics Konan University

• AIZU H.

  Department of Physics, Rikkyo University:North-Western University

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• The CALET Mission for Observing High Energy Cosmic Rays on Japanese Experiment Module of ISS
• SN1987Aから期待されるX線とぎんがによって観測されたX線(基研短期研究会「SN1987A」,研究会報告)
• MULTIPLE MESON PRODUCTION IN 10^ eV REGION(Large P_T and Dilepton,Proceedings of the Multiparticle Dynamics)
• Heavy Primary Cosmic Radiations : Prince Albert Project
• EVOLUTION OF GALAXIES AND ITS RELATION TO ORIGIN OF COSMIC RAYS.

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