Mass resolution for iron isotopes in CR-39 track detector

Satoshi Kodaira*, Nobuyuki Hasebe, Tadayoshi Doke, Atsushi Kitagawa, Hisashi Kitamura, Shinji Sato, Yukio Uchihori, Nakahiro Yasuda, Koichi Ogura, Hiroko Tawara

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)


    We have verified the capability of a CR-39 track detector for isotope identification using iron beam from the heavy-ion accelerator of HIMAC at NIRS. The same CR-39 stack was independently exposed to 56Fe and 55Fe ions with an energy of 460 MeV/nucleon. Mass resolutions for 56Fe and 55Fe ions were determined to be 0.28 ± 0.12 amu and 0.28 ± 0.11 amu in rms, respectively. A detailed analysis of the sources of the mass dispersion in the present mass identification experiment showed that significant errors were caused in the measurements of the surface position and the thickness of CR-39 sheets. By eliminating these errors as much as possible, the mass resolution is expected to be improved to ∼0.20 amu.

    Original languageEnglish
    Pages (from-to)6358-6363
    Number of pages6
    JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
    Issue number9 A
    Publication statusPublished - 2004 Sept


    • CR-39
    • Galactic cosmic rays
    • Iron isotopes
    • Mass resolution
    • Solid-state track detector

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)


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