A program for the precise observations of ultra heavy nuclei in galactic cosmic rays

S. Kodaira*, T. Doke, N. Hasebe, M. Hareyama, T. Miyaohi, M. Mlyajima, K. Sakurai, S. Ota, M. Sato, Y. Shimizu, M. Takano, S. Torii, N. Yasuda, S. Nakamura, H. Tawara, K. Ogura, S. Mikado, H. Shibuya, K. Nakazawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The origin of galactic cosmic rays (GCRs) nuclei is still unknown. Precise observation of ultra heavy GCRs would be an important step in resolving their origin including the remaining problems in cosmic ray astrophysics. A program to observe UH nuclei in GCRs is proposed which involves the use of a high performance solid-state track detector on board a long-duration balloon. The program focuses measuring the elemental and isotopic compositions of UH nuclei up to the actinides. The observation of nuclear composition covers a wide range of scientific themes including studies of nucleosynthesis in cosmic ray sources, chemical evolution of galactic material, the characteristic time of cosmic rays, and heating and acceleration mechanisms of cosmic ray particles.

Original languageEnglish
Pages (from-to)138-141
Number of pages4
Journaljournal of the physical society of japan
Issue numberSUPPL. A
Publication statusPublished - 2009


  • Chemical composition
  • Galactic cosmic rays
  • International space station
  • Long-duration balloon
  • Solid-state track detector
  • Ultra heavy nuclei

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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