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Published byHubert Gray Modified over 9 years ago
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Dark matter forms a giant sea, enclosing the milky way. The earth and solar system like a small fish, swimming in it. Dark Matter particle has a small probability hitting the atomic nuclei (<1time/100kg day ), producing atomic recoil , Direct detection of dark matter is to detect the Signals produced by this type of atomic recoil.
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Phonon Electron Photon
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Semi-Conductor ( Ge , Si ) Electric current and heat Low -T ( 0.02K )、 high-cost , hard to scale Crystal ( NaI , CsI ) light Hard to rule out background Noble gas-liquid (Xe , Ar ) Light and electrons Good to distinguish signals , ton scale
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We are on the verge of discovery! Dark Matter Rush!
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Can detect both light and electron : light : through PMT electrons : strong electric field+ gas phase Large target : large target has self-shielding effects Large atomic mass Cross section is proportional to the square of A Can be purified easily Is complementary to the semi-conductor tech
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10kg Xe Gran Sasso
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Upgrade of XENON10 Lower background than XENON10 by 100 times , background 0.005 event / kg day kev Can discriminate gamma and nucear recoil by 99.5% Continuous running since jan 2011
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Started in 2009 Major Institutions Shanghai Jiaotong University Shanghai Inst. of applied physics Shangdong University Peking University University of Michigan University of Maryland
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JinPing Hydropower plant has four water-passage tunnels of 13m diameters, two traffic tunnels of 6m diamters. Length of the tunnel, 17km Maximum depth 2400m (6000-7000 wm).
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Cooling Bus Shield Xe Storage
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