Large scale observation program of ultra heavy nuclei in galactic cosmic rays

N. Hasebe, T. Doke, M. Hareyama, S. Kodaira, T. Miyachi, M. Miyajima, O. Okudaira, K. Sakurai, S. Ota, M. Sato, Y. Shimizu, M. Takano, S. Torii, N. Yamashita, N. Yasuda, S. Nakamura, T. Kamei, H. Tawara, K. Ogura, S. MikadoH. Shibuya, K. Nakazawa, A. J. Westphal

Research output: Contribution to conferencePaperpeer-review


Our galaxy is filled with relativistic nuclei and electrons, being called galactic cosmic rays (GCRs). The origin of GCRs nuclei is still unknown. The precise observation of ultra heavy (UH) GCRs (Z ≥ 30) is important to resolve the remaining problems in cosmic ray astrophysics. Observation program of UH nuclei in GCRs is proposed with the use of high performance solid-state track detector (SSTD) on board long-duration balloon. The program focuses to measure the isotopic abundance above iron-peak elements and the composition of the rare ultra heavy nuclei up to actinide elements with relativistic energy. The observation of nuclear composition covers a wide range of scientific themes including studies of nucleosynthesis of cosmic ray sources, chemical evolution of galactic material, the characteristic time of cosmic rays, heating and acceleration mechanism of cosmic ray particles. In order to achieve the objectives, the super-ressure balloon capable of carrying very large scientific payloads for long extended period is best suited. The possible approach based on a large telescope array consisting of modularized SSTD stacks is described.

Original languageEnglish
Number of pages4
Publication statusPublished - 2007
Event30th International Cosmic Ray Conference, ICRC 2007 - Merida, Yucatan, Mexico
Duration: 2007 Jul 32007 Jul 11


Other30th International Cosmic Ray Conference, ICRC 2007
CityMerida, Yucatan

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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