Track detector of CR-39-DAP-copolymer with variable threshold to detect trans-iron nuclei in galactic cosmic rays

S. Kodaira, M. Aasaeda, T. Doke, M. Hareyama, Nobuyuki Hasebe, K. Ogura, N. Yasuda, T. Tsuruta, Y. Kori

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Observation of trans-iron nuclei in galactic cosmic rays (Z ≥ 30) requires a high performance cosmic ray detector telescope with a large exposure area because of their extremely low fluxes. A solid-state track detector such as CR-39 has the advantage of easy extension of exposure area, but it is necessary to raise the Z / β detection threshold in order to suppress background tracks produced by galactic cosmic rays with Z / β < 30. The track registration sensitivity and detection threshold for heavy ions with various Z β were verified by using track detectors of copolymers of CR-39 and DAP (diallyl phthalate) with various DAP concentration. We found that it is possible to control the Z / β detection threshold of copolymers by changing DAP concentration. In order to detect heavy ions with Z / β ≥ 30, the optimum DAP concentration was found to be approximately 50%.

    Original languageEnglish
    JournalRadiation Measurements
    Volume43
    Issue numberSUPPL.1
    DOIs
    Publication statusPublished - 2008 Aug

    Fingerprint

    phthalates
    Cosmic rays
    Heavy ions
    Cosmic ray detectors
    copolymers
    Copolymers
    Iron
    Detectors
    iron
    nuclei
    thresholds
    detectors
    Telescopes
    heavy ions
    Fluxes
    cosmic rays
    telescopes
    solid state
    sensitivity

    Keywords

    • Copolymer
    • CR-39
    • DAP
    • Galactic cosmic rays
    • Solid-state track detector
    • Threshold
    • Track registration sensitivity
    • Trans-iron nuclei
    • Ultra heavy nuclei

    ASJC Scopus subject areas

    • Radiation

    Cite this

    Track detector of CR-39-DAP-copolymer with variable threshold to detect trans-iron nuclei in galactic cosmic rays. / Kodaira, S.; Aasaeda, M.; Doke, T.; Hareyama, M.; Hasebe, Nobuyuki; Ogura, K.; Yasuda, N.; Tsuruta, T.; Kori, Y.

    In: Radiation Measurements, Vol. 43, No. SUPPL.1, 08.2008.

    Research output: Contribution to journalArticle

    Kodaira, S, Aasaeda, M, Doke, T, Hareyama, M, Hasebe, N, Ogura, K, Yasuda, N, Tsuruta, T & Kori, Y 2008, 'Track detector of CR-39-DAP-copolymer with variable threshold to detect trans-iron nuclei in galactic cosmic rays', Radiation Measurements, vol. 43, no. SUPPL.1. https://doi.org/10.1016/j.radmeas.2008.03.052
    Kodaira, S. ; Aasaeda, M. ; Doke, T. ; Hareyama, M. ; Hasebe, Nobuyuki ; Ogura, K. ; Yasuda, N. ; Tsuruta, T. ; Kori, Y. / Track detector of CR-39-DAP-copolymer with variable threshold to detect trans-iron nuclei in galactic cosmic rays. In: Radiation Measurements. 2008 ; Vol. 43, No. SUPPL.1.
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    abstract = "Observation of trans-iron nuclei in galactic cosmic rays (Z ≥ 30) requires a high performance cosmic ray detector telescope with a large exposure area because of their extremely low fluxes. A solid-state track detector such as CR-39 has the advantage of easy extension of exposure area, but it is necessary to raise the Z / β detection threshold in order to suppress background tracks produced by galactic cosmic rays with Z / β < 30. The track registration sensitivity and detection threshold for heavy ions with various Z β were verified by using track detectors of copolymers of CR-39 and DAP (diallyl phthalate) with various DAP concentration. We found that it is possible to control the Z / β detection threshold of copolymers by changing DAP concentration. In order to detect heavy ions with Z / β ≥ 30, the optimum DAP concentration was found to be approximately 50{\%}.",
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    AU - Aasaeda, M.

    AU - Doke, T.

    AU - Hareyama, M.

    AU - Hasebe, Nobuyuki

    AU - Ogura, K.

    AU - Yasuda, N.

    AU - Tsuruta, T.

    AU - Kori, Y.

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    KW - Track registration sensitivity

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    KW - Ultra heavy nuclei

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