Improvement of mass resolution for iron isotopes in CR-39 track detector

Satoshi Kodaira*, Nakahiro Yasuda, Nobuyuki Hasebe, Tadayoshi Doke, Shuya Ota, Masashi Sato, Hiroko Tawara, Koichi Ogura

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)


    The capability of the CR-39 track detector for isotope identification was verified using 56Fe and 55Fe beams from the heavy ion accelerator HIMAC at NIRS. A CR-39 stack was exposed to 56Fe and 55Fe beams with the energies of 460MeV/nucleon. Drastic improvements in the accuracies of microscopic image analysis and detector thickness measurement enabled us to identify those iron isotopes with high mass resolution using the CR-39 track detector. As a consequence of the reduction of systematic errors, the mass resolution for iron isotopes in the CR-39 detector was obtained to be 0.22 ± 0.03 amu in rms. The mass resolution newly obtained by the CR-39 detector was compared with the former result and found to be 66% better than the former value of mass resolution as a result of reducing the systematic errors of mass dispersion. Moreover, the ultimate mass resolution of the CR-39 detector was estimated by calculation using those experimental results. As a consequence of reducing the random error, it is expected that the mass resolution for iron isotopes can ultimately approach to ∼0.10 amu in the CR-39 detector.

    Original languageEnglish
    Pages (from-to)5281-5287
    Number of pages7
    JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
    Issue number8 A
    Publication statusPublished - 2007 Aug 6


    • CR-39
    • Galactic cosmic rays
    • Iron isotopes
    • Mass resolution
    • Solid-state track detector
    • Trans-iron nuclei
    • Ultra heavy nuclei

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)


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