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

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    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

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    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

    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, 43(SUPPL.1). https://doi.org/10.1016/j.radmeas.2008.03.052