Charge resolution of CR-39 plastic nuclear track detectors for intermediate energy heavy ions

S. Ota, N. Yasuda, L. Sihver, S. Kodaira, M. Kurano, S. Naka, Y. Ideguchi, E. R. Benton, Nobuyuki Hasebe

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    The charge resolution (δZ) for heavy ions (nuclear charge: Z < 40) of 0.1-1 GeV/n energy in CR-39 plastic nuclear track detector (PNTD) and its dependence on etching time, and on projectile Z and energy were investigated and optimized as part of an effort to make precise measurements of projectile charge-changing cross sections. Two types of CR-39 PNTD, HARZLAS TD-1 and BARYOTRAK, were exposed to heavy ion beams with seven values of Z behind thick targets to produce projectile fragments. Following chemical etching (7 N NaOH at 70 °C) for varying etch times, δZ of the projectiles was determined for each detector type. A strong dependence of δZ on the amount of bulk etch (B) was seen. It was also observed that δZ can be remarkably improved with longer etching time as a function of B-1/2, in accordance with the trend seen in other types of track detector such as glass nuclear track detector. However, for B ≥ 60 μm (30 h etching), saturation occurs and there is no further improvement in δZ. Analysis of the correlations between projectile Z, energy, detector response, and fluctuation of the response make it possible to develop a model to predict the δZ for projectiles of given Z and energy. The predicted and measured values of δZ show good agreement within 10%. We conclude that 4 ≤ Z ≤ 30 at intermediate energy can be identified with good δZ in these detectors. The predictive model will be used in designing future cross section measurement experiments.

    Original languageEnglish
    Pages (from-to)1382-1388
    Number of pages7
    JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
    Volume269
    Issue number12
    DOIs
    Publication statusPublished - 2011 Jun 15

    Keywords

    • Charge resolution
    • Charge-changing cross section
    • CR-39 nuclear track detector
    • Galactic cosmic ray
    • Heavy ion
    • Nuclear fragmentation

    ASJC Scopus subject areas

    • Instrumentation
    • Nuclear and High Energy Physics

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