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

    Research output: Contribution to journalArticle

    15 Citations (Scopus)

    Abstract

    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
    Volume46
    Issue number8 A
    DOIs
    Publication statusPublished - 2007 Aug 6

    Fingerprint

    iron isotopes
    Isotopes
    Iron
    Detectors
    detectors
    Systematic errors
    systematic errors
    ion accelerators
    Thickness measurement
    Random errors
    random errors
    Heavy ions
    image analysis
    Image analysis
    Particle accelerators
    heavy ions
    isotopes

    Keywords

    • 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)

    Cite this

    Improvement of mass resolution for iron isotopes in CR-39 track detector. / Kodaira, Satoshi; Yasuda, Nakahiro; Hasebe, Nobuyuki; Doke, Tadayoshi; Ota, Shuya; Sato, Masashi; Tawara, Hiroko; Ogura, Koichi.

    In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 46, No. 8 A, 06.08.2007, p. 5281-5287.

    Research output: Contribution to journalArticle

    Kodaira, Satoshi ; Yasuda, Nakahiro ; Hasebe, Nobuyuki ; Doke, Tadayoshi ; Ota, Shuya ; Sato, Masashi ; Tawara, Hiroko ; Ogura, Koichi. / Improvement of mass resolution for iron isotopes in CR-39 track detector. In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers. 2007 ; Vol. 46, No. 8 A. pp. 5281-5287.
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