Direction-Sensitive Dark Matter Search --NEWAGE--
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1 Direction-Sensitive Dark Matter Search --NEWAGE-- (New generation WIMP search with an advanced gaseous tracker experiment) Kentaro Miuchi (Kobe University) with K. Nakamura, A. Takada T. Tanimori, H. Kubo, H. Nishimura A. Takeda, H. Sekiya
2 OUTLINE Motivation Methods 1 st underground result Latest activities Summary
3 Motivation
4 1. Motivation PLB 578 (2004) 241 WIMP-wind detection SOLAR SYSTEM 220 km/s low pressure gas forward recoils short tracks WIMP V0 =230 km/s The WIMP-wind
5 WHY Direction-sensitive? Large mass for exclusion (and indication) BUT Annual modulation is not enough Direction-sensitive for a concrete evidence and further study of halo dark matter Annual modulation WIMP WIND F γ direction
6 Expected Sensitivities Goal: Detect the WIMP-wind low pressure ( CF bar ) large volume (1m 3 N) radio-pure materials CURRENT: pilot run CF bar (0.3m) 3 normal materials PLB 578 (2004) 241
7 Methods
8 Methods (3D tracking device) NEWAGE-0.3a : cm 3 TPC 2012 JINST 7 C02023 X readout (768ch) TPC e GEM( 10) Y readout (768ch) m-pic ( 5000) FAGA position encoder (1536ch) Position Encoder Feb. 20, 2007 APPEAL07
9 3D tracking device: microtpc 2D imaging device: m-pic (gas gain 5000) 400mm pitch cm 2 Gas volume DRIFT length 31cm gas volume Readout electronics Digital 3D-HIT (track) +charge (energy) 30cm μpic (Toshiba) 100MHz, pipeline TPC system
10 TPC Performance 1nuclear tracking CF 4 +C 4 H 10 (9:1) 0.2 atm n -> p forward scattering (emulation of WIMP -> F scatterings) CF 4 +C 4 H Cf run 30cm Z(drift) 0cm -15cm 252 Cf (NE45 zenith35 ) X 15cm Proton tracks -15cm Y 252 Cf n 15cm q p n 0 Cos q 1 Jan 27, Recoil 2007 direction 3rd MPGD workshop image
11 TPC Performance 2gamma rejection n + gamma run (252Cf) energy vs length cut gamma rejection efficiency gamma rejection efficiency gamma run (137Cs) gamma rejection efficiency=electron detection efficiency
12 1 st underground result =NEWAGE-0.3a Kamioka Run5 K.Miuchi+ PLB2010(686)11
13 Kamioka Kamioka mine 2700m w.e depth DM measurement Background Study Lab-B XMASS SK Nara Kamioka
14 RUN5: Detector Target gas: CF4 0.2atm (0.0115kg) Exposure:0.524 kg days (Sep Dec. 2008) Energy resolution 70%@100keV(FWHM) Position resolution 800μm (rms) angular resolution ~55 (RMS)
15 counts/kev/kg/days RUN5 results1 Energy spectrum 1/5 rate of the surface run energy spectrum (PLB 686 (2010) 11 ) DM direction kev North sky by C and F nuclei ( keV)
16 RUN5 results2 The sky map --> cosq distribution --> upper limits new limits 5400pb for 150GeV (PLB 686 (2010) 11 ) DM direction North sky by C and F nuclei ( keV) direction-sensitive upper limits Cosθ distribution ( keV) 10 GeV 100 GeV 1000 GeV
17 Recent activities Sensitivity improvement (underground updates) To go further (surface R&Ds)
18 Sensitivity improvement radon gas gamma rays α particles DAQ upgrade low background aiming 1/10 low threshold Kamioka RUN-13 RUN13-1 : 2012 Jan. 23 March 8 RUN13-2 : 2012 March 8 May 24 RUN13-3 : 2012 May28- TODAY
19 Radon: charcoal gas circulation system monitor radon rate (~6MeV) radon rate ~1/10 after day10 charcoal filter ~100g (TSURUMICOAL 2GS)) getter pump (SAES GETTER C400-2DSK) circulation (Teflon bellows pump) NEWAGE0.3a 152 torr CF4 gas without charcoal with charcoal cf:1e5counts/kg/days~1bq/m 3
20 gamma: precise gain map gas gain is not uniform in 30 30cm 2 old gain map RUN5 new gain map RUN13 20cm 137Cs run remaining events after gamma rejection 137Cs run remaining events after gamma rejection gamma rejection 8.1e-6 gamma rejection 1.0e-6>
21 radon, gamma, alpha: "clean" materials to <1/10 radon emanation level glass-reinforced fluoro-plastic PTFE + copper wire
22 Results(preliminary) exposure 0.140kg days spectrum threshold 100keV 50keV rate: ~1/5 at 100keV direction-sensitive analysis: on-going RUN5 RUN13 preliminary RUN13 (E>100keV analysis)
23 To go further (R&D in surface labo.) NEWAGE-0.3b detection volume cm 3 Cold charcoal 0.2atm 0.1atm CF4 gas for lower threshold 60cm K.Nakamura 2012 JINST 7 C02023 angular resolution 0.1atm 0.2atm
24 SUMMARY NEWAGE: direction-sensitive DM exp. 1 st underground run: updated direction-sensitive results underground and surface R&Ds are on-going
Direction-Sensitive Dark Matter Search --NEWAGE--
Direction-Sensitive Dark Matter Search --NEWAGE-- (New generation WIMP search with an advanced gaseous tracker experiment) Kentaro Miuchi (Kobe University) with K. Nakamura, A. Takada, T. Tanimori, H.
Kiseki Nakamura (Kyoto university)
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