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 conferencePaper

Abstract

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
Pages51-54
Number of pages4
Publication statusPublished - 2007 Jan 1
Event30th International Cosmic Ray Conference, ICRC 2007 - Merida, Yucatan, Mexico
Duration: 2007 Jul 32007 Jul 11

Other

Other30th International Cosmic Ray Conference, ICRC 2007
CountryMexico
CityMerida, Yucatan
Period07/7/307/7/11

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Hasebe, N., Doke, T., Hareyama, M., Kodaira, S., Miyachi, T., Miyajima, M., Okudaira, O., Sakurai, K., Ota, S., Sato, M., Shimizu, Y., Takano, M., Torii, S., Yamashita, N., Yasuda, N., Nakamura, S., Kamei, T., Tawara, H., Ogura, K., ... Westphal, A. J. (2007). Large scale observation program of ultra heavy nuclei in galactic cosmic rays. 51-54. Paper presented at 30th International Cosmic Ray Conference, ICRC 2007, Merida, Yucatan, Mexico.