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

    Research output: Contribution to journalArticle

    13 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)1817-1822
    Number of pages6
    JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
    Volume267
    Issue number10
    DOIs
    Publication statusPublished - 2009 May 15

    Keywords

    • Balloon-borne experiment
    • Charge resolution
    • Cosmic ray
    • CR-39
    • Heavy ion
    • Mass resolution
    • Solid-state nuclear track detector
    • Temperature effect
    • Track registration sensitivity
    • Vacuum effect

    ASJC Scopus subject areas

    • Instrumentation
    • Nuclear and High Energy Physics

    Fingerprint Dive into the research topics of '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'. Together they form a unique fingerprint.

  • Cite this