! 2 ANKOK 5:! ! ! ! ! ! !28aSJ-3 28aSJ-1 • • ! • • ! 28aSJ-2 ! • ! • • ! • ! ! • ! ! ! ! ! 2 ! S1 S2 ! ! ! ! 1.39!g/cm3 39Ar:! S1 -186 ! ! 128!nm! :!! 50!/keV! 1!Bq/kg! ! 6!ns! 1.5!μs! ANKOK 50GeV/c2,WIMP DAMA CoGeNT,, (2013) 10GeV/c2,WIMP, ENR,<,~20keVnr, WARP(2007), 100kg days • 10!GeV/c2 DS550,(2014), 1400kg days LUX,2013, Xe2 – – (Ar) (ENR~20!keV) ! ! ! • 1000!kg!x!day!(30kg!x!30!days) 2 • • – 2 Ar!>!Xe!:! ! ! 2 ! – !Xe(175nm)!>!Ar(128nm)!:!~1.5 • 39Ar!(ER • PSD! ) ! !! – Ar(slow:!1.5μs)! >>! Xe! • S2/S1! – Xe! – !!!!!! – Xe – Ar Ar!! Xe!>!Ar! S2 (<100keV) ! Mani!Tripathi,!et.al ! O2,N2! 39Ar! 2 DAQ ! BG ! BG ! ! 10!GeV/c2!WIMP ! ! (128nm )! ! ! ! ! ! ! ! ...! ! ! ! 7, Micro!Torr! !!!!!!&!N2!Filter 2 3 2 , ( Bldg!51! , DAQ! Waseda!University! Slow!control Shinjuku,!Tokyo ! <1ppb ~12 ! <100ppb) 75L!vessel! 30cmφ!x!100cm LAr!tank ! PMT • • • • – ESR • 2015 1 ! PMT ! S2 ! ! ! !+!TPB! 2015 6 ! • ~7!pes/keVee • ~30!keVnr ER/NR ! • ~100!mBq/kg α !α, 222Rn 218Po 214Po • – – 200L • – • • ! 51 8 ! (φ50cm!x!H100cm)! ! ! (300!kg/m2)! 2m 4m • Ar!VUV!MPPC – arXiv:1505.00091! – 128nm – 241Amα ! ! PDE~12% Signal!Charge!! @Vover~3V PDE!vs!Vover • 30kg!(30cmφx30cmL) !!!!!! ! • PMT!~!20 ( 10 )! – – ! – – Fiducial!cut ! • MPPC PMT! MPPC! ! TPB! Reflector! GAr! ! LAr ! ! ! • 2 (ANKOK ! – – ENR!~!20!keV • • • (DAMA – 2 – ~20!keVnr – ~100!mBq/kg – – – – – ) ! (~1kg) α ( ! ! ER/NR ! ! ! ! (~30kg) 10kg) ! ! ! ! ! ! )
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