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.

–

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.