KamLAND-PICO dark matter search project Low background test by highly radiopure NaI(Tl)

ORAL

Abstract

KamLAND-PICO aims to search for WIMPs dark matter by means of highly radiopure NaI(Tl) scintillator. The impurities in NaI(Tl) has been successfully reduced by chemical processing of raw NaI(Tl) powder. The intensity of alpha ray was observed and the contamination in 210Pb has been dramatically reduced to about 60 $\mu$Bq/kg. The present status of low background measurement will be reported.

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Authors

  • KenIchi Fushimi

    • The University of Tokushima

  • Hiroyasu Ejiri

    • RCNP, Osaka University

  • Ryuta Hazama

    • Osaka Sangyo University

  • Haruo Ikeda

    • RCNS, Tohoku University

  • Kyoshiro Imagawa

    • I.S.C. Lab.

  • Kunio Inoue

    • RCNS, Tohoku University
    • Tohoku University

  • Alexandre Kozlov

    • IPMU, The University of Tokyo

  • Reiko Orito

    • The University of Tokushima

  • Tatsushi Shima

    • RCNP, Osaka University
    • Research Center for Nuclear Physics, Osaka University

  • Yasuhiro Takemoto

    • IPMU, The University of Tokyo

  • Saori Umehara

    • RCNP, Osaka University
    • Research Center for Nuclear Physics, Osaka University

  • Kensuke Yasuda

    • I.S.C. Lab.