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Studying the Mass Composition of Cosmic Rays with Energies of 1015–1017 eV in the PRISMA Project

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Bulletin of the Russian Academy of Sciences: Physics Aims and scope

Abstract

The mass composition of primary cosmic rays remains an unresolved problem of physics in the region of energies above the knee. Results from different experiments are contradictory in assessments of the mean mass number and its variation as the primary energy grows. The PRISMA project is designed to study the energy spectrum and mass composition of cosmic rays at energies of 1015–1017 eV. The project is based on a detector capable of simultaneously detecting the electromagnetic and hadron components of a shower. The results are presented from measurements with the PRISMA-YBJ prototype located at 4300 m a.s.l., made over 3.5 years of operation. A new way of estimating the average mass composition from the electron/neutron ratio is tested.

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FUNDING

This work was supported by the Russian Foundation for Basic Research, projects nos. 16-29-13067_ofi_m and 18-02-00339; and by the program of the Presidium of the Russian Academy of Sciences “The Physics of Fundamental Interactions and Nuclear Technologies.”

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Authors and Affiliations

  1. Institute for Nuclear Research, Russian Academy of Sciences, 142190, Moscow, Russia

    O. B. Shchegolev, V. V. Alekseenko, Yu. V. Stenkin, V. I. Stepanov & Ya. V. Yanin

  2. National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 115409, Moscow, Russia

    Yu. V. Stenkin

  3. Institute of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, China

    Z. Cao, X. Xe, X. Ma & J. Zhao

  4. Heibei Normal University, , 050041, Shijiazhuang,, China

    Z. Cai, S. Cui, X. Guo, C. Guo & Y. Liu

Authors
  1. O. B. Shchegolev
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  2. V. V. Alekseenko
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  3. Yu. V. Stenkin
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  4. V. I. Stepanov
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  5. Ya. V. Yanin
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  6. Z. Cai
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  7. Z. Cao
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  8. S. Cui
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  9. X. Guo
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  10. C. Guo
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  11. X. Xe
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  12. Y. Liu
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  13. X. Ma
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  14. J. Zhao
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Corresponding author

Correspondence to O. B. Shchegolev.

Additional information

Translated by G. Dedkov

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Shchegolev, O.B., Alekseenko, V.V., Stenkin, Y.V. et al. Studying the Mass Composition of Cosmic Rays with Energies of 1015–1017 eV in the PRISMA Project. Bull. Russ. Acad. Sci. Phys. 83, 632–634 (2019). https://doi.org/10.3103/S1062873819050320

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  • DOI: https://doi.org/10.3103/S1062873819050320

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