PICO-LON Dark Matter Search

4th Workshop on Directional Detection of Dark Matter

Fushimi, K.^1 ; Nakayama, S.^1 ; Orito, R.^1 ; Sugawara, R.^1 ; Awatani, Y.^1 ; Ejiri, H.^2 ; Shima, T.^2 ; Hazama, R.^3 ; Inoue, K.^4 ; Ikeda, H.^4 ; Kozlov, A.^5

Insitiute of Socio- Arts and Sciences, University of Tokushima, 1-1 Minamijosanjimacho, Tokushima city, 770-8502, Tokushima, Japan^1

Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki city Osaka, 567-0047, Japan^2

Graduate School and Faculty of Human Environment, Osaka Sangyo University, 3-1-1 Nakagaito, 574-8530 Daito, Osaka, Japan^3

Research Centre for Neutrino Science, Tohoku University, 6-3 Aramaki Aza Aoba, Aobaku Sendai, Miyagi, 980-8578, Japan^4

Kavli Institute for the Physics and Mathematics of the Universe, 5-1-5 Kashiwanoha, 277-8583, Kashiwa, Japan^5

关键词: Annual modulations;    Dark matter searches;    Energy resolutions;    Inorganic crystals;    Inorganic scintillator;    Low background;    Low energy thresholds;    Pulse shape analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/469/1/012011/pdf
DOI  :  10.1088/1742-6596/469/1/012011

来源: IOP

【 摘 要 】

It is an important task to find an annual modulation of WIMPs signal for identifying dark matter signal. To search for annual modulation signal by means of inorganic scintillators, a large mass and a highly radiopure detector is needed. PICO-LON (Planar Inorganic Crystal Observatory for LOw background Neutr(al)inos) is a dark matter search project with multi-array NaI(Tl) scintillators. The test module of PICO-LON whose dimension is 15cm×15cm×0.1cm gives enough performance, energy resolution and low energy threshold, for dark matter search. The highly radiopure NaI(Tl) crystal is indispensable to start a large mass experiment. We have developed highly radiopure NaI(Tl) scintillator. The U and Th chain impurities were precisely measured by meand of pulse shape analysis for NaI(Tl) scintillators. The future plan of KamLAND-PICO dark matter search project is proposed.