Scintillation and ionization ratio of liquid argon for electronic and nuclear recoils at drift-fields up to 3 kV/cm

Tatsuki Washimi, M. Kimura, M. Tanaka, Kohei Yorita

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    1 Citation (Scopus)


    A two-phase argon detector has high discrimination power between electron recoil and nuclear recoil events based on the pulse shape discrimination and the ionization/scintillation ratio (S2/S1). This character is very suitable for the dark matter search to establish the low background experiment. However, the basic properties of S2/S1 of argon are not well known, as compared with xenon. We report the evaluation of S2/S1 properties with a two-phase detector at drift-fields of 0.2–3.0 kV/cm. Finally, the discrimination power against electron recoil background of S2/S1 is discussed.

    Original languageEnglish
    Pages (from-to)22-25
    Number of pages4
    JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
    Publication statusPublished - 2018 Dec 1



    • Argon
    • Dark matter
    • Particle identification
    • Time projection camber
    • Two-phase detectors

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics
    • Instrumentation

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