A future plan in observing ultra-heavy nuclei (Z = 30-110) of cosmic rays with large-scale collector at the lunar base

Nobuyuki Hasebe, S. Kodaira, M. Hareyama, N. Yasuda

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    Abstract

    Lunar-based measurement of galactic cosmic ray (GCR) nuclei with a high precision is a challenging approach in cosmic ray research for the coming 20 years. This approach focuses to measure the elemental composition of Pt- and Pb-groups, actinide and possibly trans-uranic nuclei of Pu and Cm. The observation covers a wide range of scientific themes including the study on the origin of GCR nuclei, the characteristic time, heating and acceleration mechanism of GCR particles. A large-scaled particle telescope is required in order to measure those nuclides with high precision. Solid state nuclear track detectors (SSTDs) with a geometric factor of about 1000 m2sr allow us to measure them easily. Fluorescent nuclear track detector such as Al2O3 doped with C and Mg is the best candidate at present among SSTDs for a lunar-based experiment which is currently the focus of an international program of scientific investigation. A permanent sunshine region near crater at lunar polar region is thought to be an excellent site. A two-year-exposure by the large-scaled telescope would result in the detection of about 30,000 actinides in GCRs.

    Original languageEnglish
    Pages (from-to)913-916
    Number of pages4
    JournalRadiation Measurements
    Volume44
    Issue number9-10
    DOIs
    Publication statusPublished - 2009 Oct

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    Keywords

    • Cosmic ray
    • Lunar base
    • Nuclear composition
    • Nuclear track detector

    ASJC Scopus subject areas

    • Radiation
    • Instrumentation

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