Heavy component spectra and secondary to primary ratios obtained by RUNJOB experiment

M. Ichimura, V. A. Derbina, V. I. Galkin, M. Hareyama, Y. Hirakawa, Y. Horiuchi, N. Inoue, E. Kamioka, T. Kobayashi, V. V. Kopenkin, S. Kuramata, A. K. Managadze, H. Matsutani, N. P. Misnikova, R. A. Mukhamedshin, S. Nagasawa, R. Nakano, M. Namiki, M. Nakazawa, H. NanjoS. N. Nazarov, S. Ohata, H. Ohtomo, V. I. Osedlo, D. S. Oshuev, P. A. Publichenko, I. V. Rakobolskaya, T. M. Roganova, C. Saito, G. P. Sazhina, H. Semba, T. Shibata, D. Shuto, H. Sugimoto, R. Suzuki, L. G. Sveshnikova, V. M. Taran, N. Yajima, T. Yamagami, I. V. Yashin, E. A. Zamchalova, G. T. Zatsepin, I. S. Zayarnaya

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2 Citations (Scopus)

Abstract

RUNJOB final results on the energy spectra of primary heavy cosmic ray components are presented. Data are from ten RUNJOB campaigns performed from 1995 through 1999. And the energy spectra of CNO, NeMgSi and Fe groups are shown here as well as the energy dependence of the secondary/primary ratio. We find our heavy component spectra are in agreement with the extrapolation from those at lower energies obtained by CRN (Chicago group), monotonically decreasing with energy, in contrast to JACEE and SOKOL data, which indicated a gradual increase with energy, particularly for the CNO group at ̃ 5 TeV/nucleon. As for the secondary to primary ratio we have observed in TeV/nucleon energy region, it is difficult to determine the energy dependence of their average path lengths by the RUNJOB data only, because the large uncertainty of atmospheric corrections due to the poor statistics exists.

Original languageEnglish
Pages21-24
Number of pages4
Publication statusPublished - 2005 Jan 1
Event29th International Cosmic Ray Conference, ICRC 2005 - Pune, India
Duration: 2005 Aug 32005 Aug 10

Conference

Conference29th International Cosmic Ray Conference, ICRC 2005
CountryIndia
CityPune
Period05/8/305/8/10

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Ichimura, M., Derbina, V. A., Galkin, V. I., Hareyama, M., Hirakawa, Y., Horiuchi, Y., Inoue, N., Kamioka, E., Kobayashi, T., Kopenkin, V. V., Kuramata, S., Managadze, A. K., Matsutani, H., Misnikova, N. P., Mukhamedshin, R. A., Nagasawa, S., Nakano, R., Namiki, M., Nakazawa, M., ... Zayarnaya, I. S. (2005). Heavy component spectra and secondary to primary ratios obtained by RUNJOB experiment. 21-24. Paper presented at 29th International Cosmic Ray Conference, ICRC 2005, Pune, India.