Temperature and pressure conditions for the appropriate performance of charge and mass resolutions in balloon-borne CR-39 track detector for the heavy cosmic rays

S. Kodaira*, N. Yasuda, H. Tawara, K. Ogura, T. Doke, Nobuyuki Hasebe, T. Yamauchi

*この研究の対応する著者

    研究成果: Article査読

    13 被引用数 (Scopus)

    抄録

    We experimentally determined the suitable conditions of temperature and air pressure for measuring charge and mass compositions of heavy cosmic rays using CR-39 track detectors during long-duration, high-altitude balloon flights. The experiments were carried out utilizing Fe ion beams from Heavy Ion Medical Accelerator (HIMAC). Changes in the track registration sensitivity with temperature were studied at temperatures between 213 and 293 K. The charge and mass shifts around Fe ions are possibly 0.11 cu (charge unit) and 0.47 amu (atomic mass unit) at the temperature deviation between 227 and 243 K at balloon altitude. Decrease in track registration sensitivity as air pressure decreases has been observed between 13 Pa and 27 kPa. The charge and mass shifts around Fe ions are inferred to be 0.02 cu and 0.09 amu, respectively, when pressure varies between 20 and 27 kPa. During balloon flight, air pressure drops below this; therefore, care must be taken to keep the temperature and air pressure of CR-39 detectors within acceptable limits.

    本文言語English
    ページ(範囲)1817-1822
    ページ数6
    ジャーナルNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
    267
    10
    DOI
    出版ステータスPublished - 2009 5 15

    ASJC Scopus subject areas

    • 器械工学
    • 核物理学および高エネルギー物理学

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