The XMASS 800kg Experiment Jing LIU IPMU, Univ. of Tokyo TAUP2011, Munich XMASS collaboration: Kamioka Observatory, ICRR, Univ. of Tokyo : Y. Suzuki, M. Nakahata, S. Moriyama, M. Yamashita, Y. Kishimoto, Y. Koshio, A. Takeda, K. Abe, H. Sekiya, H. Ogawa, K. Kobayashi, K. Hiraide, A. Shinozaki, S. Hirano, D. Umemoto, O. Takachio, K. Hieda IPMU, University of Tokyo : K. Martens, J.Liu Kobe University: Y. Takeuchi, K. Otsuka, K. Hosokawa, A. Murata Tokai University: K. Nishijima, D. Motoki, F. Kusaba Gifu University : S. Tasaka Yokohama National University : S. Nakamura, I. Murayama, K. Fujii Miyagi University of Education : Y. Fukuda STEL, Nagoya University : Y. Itow, K. Masuda, H. Uchida, Y. Nishitani, H. Takiya Sejong University : Y.D. Kim KRISS: Y.H. Kim, M.K. Lee, K. B. Lee, J.S. Lee
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The XMASS 800kg Experiment Jing LIU IPMU, Univ. of Tokyo TAUP2011, Munich XMASS collaboration: Kamioka Observatory, ICRR, Univ. of Tokyo : Y. Suzuki, M.
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The XMASS 800kg Experiment
Jing LIUIPMU, Univ. of TokyoTAUP2011, Munich
XMASS collaboration:Kamioka Observatory, ICRR, Univ. of Tokyo :
Y. Suzuki, M. Nakahata, S. Moriyama, M. Yamashita, Y. Kishimoto,Y. Koshio, A. Takeda, K. Abe, H. Sekiya, H. Ogawa, K. Kobayashi,K. Hiraide, A. Shinozaki, S. Hirano, D. Umemoto, O. Takachio, K. Hieda
IPMU, University of Tokyo : K. Martens, J.LiuKobe University: Y. Takeuchi, K. Otsuka, K. Hosokawa, A. MurataTokai University: K. Nishijima, D. Motoki, F. KusabaGifu University : S. TasakaYokohama National University : S. Nakamura, I. Murayama, K. FujiiMiyagi University of Education : Y. FukudaSTEL, Nagoya University : Y. Itow, K. Masuda, H. Uchida, Y. Nishitani, H. TakiyaSejong University : Y.D. KimKRISS: Y.H. Kim, M.K. Lee, K. B. Lee, J.S. Lee
The XMASS Experiment
XMASS 800kg Jing LIU @ TAUP2011 2
Xenon MASSive detector for Solar neutrino (pp/7Be)Xenon neutrino MASS detector (double beta decay)
Xenon detector for weakly interacting MASSive Particles
~100 kg LXeprototype
~800 kg LXedirect dark matter search
~26 ton LXeMulti-purpose
LXe (Liquid Xenon) surrounded by PMTs (Photomultiplier Tubes) recording scintillation lights generated by nuclear or electronic recoils in LXe
PMT
LXe inside
Jing LIU @ TAUP2011
The XMASS Experiment
XMASS 800kg 3
Xenon MASSive detector for Solar neutrino (pp/7Be)Xenon neutrino MASS detector (double beta decay)
Xenon detector for weakly interacting MASSive Particles
~100 kg LXeprototype
~800 kg LXedirect dark matter search
~26 ton LXeMulti-purpose
LXe (Liquid Xenon) surrounded by PMTs (Photomultiplier Tubes) recording scintillation lights generated by nuclear or electronic recoils in LXe
PMT
LXe inside
, n, ,… or ?
PMT
LXe
scintillation
Jing LIU @ TAUP2011
The XMASS Experiment
XMASS 800kg 4
Xenon MASSive detector for Solar neutrino (pp/7Be)Xenon neutrino MASS detector (double beta decay)
Xenon detector for weakly interacting MASSive Particles
~100 kg LXeprototype
~800 kg LXedirect dark matter search
~26 ton LXeMulti-purpose
LXe (Liquid Xenon) surrounded by PMTs (Photomultiplier Tubes) recording scintillation lights generated by nuclear or electronic recoils in LXe
PMT
LXe inside PMT
LXe
The XMASS Experiment
XMASS 800kg Jing LIU @ TAUP2011 5
Xenon MASSive detector for Solar neutrino (pp/7Be)Xenon neutrino MASS detector (double beta decay)
Xenon detector for weakly interacting MASSive Particles
~100 kg LXeprototype
~800 kg LXedirect dark matter search
~26 ton LXeMulti-purpose
LXe (Liquid Xenon) surrounded by PMTs (Photomultiplier Tubes) recording scintillation lights generated by nuclear or electronic recoils in LXe
PMT
LXe inside
Jing LIU @ TAUP2011
The XMASS Experiment
XMASS 800kg 6
Xenon MASSive detector for Solar neutrino (pp/7Be)Xenon neutrino MASS detector (double beta decay)
Xenon detector for weakly interacting MASSive Particles
~100 kg LXeprototype
~800 kg LXedirect dark matter search
~26 ton LXeMulti-purpose
LXe (Liquid Xenon) surrounded by PMTs (Photomultiplier Tubes) recording scintillation lights generated by nuclear or electronic recoils in LXe
PMT
LXe inside
Jing LIU @ TAUP2011
The XMASS Experiment
XMASS 800kg 7
Xenon MASSive detector for Solar neutrino (pp/7Be)Xenon neutrino MASS detector (double beta decay)
Xenon detector for weakly interacting MASSive Particles
~100 kg LXeprototype
~800 kg LXedirect dark matter search
~26 ton LXeMulti-purpose
LXe (Liquid Xenon) surrounded by PMTs (Photomultiplier Tubes) recording scintillation lights generated by nuclear or electronic recoils in LXe
PMT
LXe inside
Jing LIU @ TAUP2011 8
Structure of XMASS 800kg detector
XMASS 800kg
PMT
Jing LIU @ TAUP2011 9
Structure of XMASS 800kg detector
XMASS 800kg
PMT
Pentakis dodecahedron
~10 PMTs in one triangle642 PMTs in total
~0.8 meter
PMT photo-cathodes cover ~62% inner surface
Jing LIU @ TAUP2011 10
Reconstruct interaction point from PMT hit pattern
XMASS 800kg
Colored photo cathodes indicating number of p.e. (photoelectrons) recorded by PMTs
Interaction point (vertex) can be reconstructed from the PMT hit pattern.
Jing LIU @ TAUP2011 11
LXe self-shielding
XMASS 800kg
Simulation: g into LXe
waterLXe
E [keV]
Att
enu
atio
n le
ng
th o
f
[cm
]
Jing LIU @ TAUP2011 12
Where is it?
XMASS 800kg
1000 m rock overburden(2700 m water equiv.):Muon: 6.0x10-8 /cm-2/s/srNeutron: 1.2x10-6/cm-2/s
360m above the sea
Horizontal access:15 minutes drive from office,too easy to get in!No excuse to avoid 24-hour shift
Kamioka underground observatory
Jing LIU @ TAUP2011 13XMASS 800kg
New experimental hall, Aug. 2008
15 meter15
met
er20 meter
Jing LIU @ TAUP2011 14XMASS 800kg
water tank, Nov. 2008
10 m x 10 m
Jing LIU @ TAUP2011 15XMASS 800kg
Frame of clean room in water tank, Mar. 2008
Jing LIU @ TAUP2011 16XMASS 800kg
PMT mounting in clean room, Dec. 2009
Jing LIU @ TAUP2011 17XMASS 800kg
PMT mounting finished, Feb. 2010
Jing LIU @ TAUP2011 18XMASS 800kg
Water filling, Sep. 2010
Jing LIU @ TAUP2011 19XMASS 800kg
Commissioning started, Nov. 2010
Jing LIU @ TAUP2011 20
Scintillation light yield :: calibration system
XMASS 800kg
Top PMT can be pulled out
Source changed here
Z position of source is controlled by a motor on top at <1 mm accuracy
x
y
z
57Co, 241Am, 109Cd, 55Fe, 137Cs
~F 4mm
~F 0.15mm for 57Co
Jing LIU @ TAUP2011 21
Scintillation light yield: 15.9 1.2 p.e./keV (57Co at center)
XMASS 800kg
DataMC
122 keV
136 keV59.3 keV (W)
Number of photoelectrons
Arbi
trar
y un
it
Position & energy resolution (122keV g from 57Co)
DataReconstructed vertices for various source positions Position resolution (RMS):