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The Recent Status of Dark Matter Search from KIMS Group

The Recent Status of Dark Matter Search from KIMS Group. 岳骞 清华大学 2006 年 10 月 31 日 高能物理学术年会 · 桂林. Contents. The recent results of DM direct detection Overview of KIMS Experiment THUNDER project Future Plan. Standard Cosmology. The Nobel Prize in Physics 2006.

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The Recent Status of Dark Matter Search from KIMS Group

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  1. The Recent Status of Dark Matter Search from KIMS Group 岳骞 清华大学 2006年10月31日 高能物理学术年会·桂林

  2. Contents • The recent results of DM direct detection • Overview of KIMS Experiment • THUNDER project • Future Plan

  3. Standard Cosmology The Nobel Prize in Physics 2006 "for their discovery of the blackbody form and anisotropy of the cosmic microwave background radiation" COBE WMAP George F. Smoot John C. Mather

  4. Galactic Dark Matter rotation velocity curve Direct detection of galactic dark matter WIMP Recoiled nucleus Recoil energy <100 keV Event rate < 1/kg/day Density of dark matter around the sun ~ 0.3 GeV /cm3 ~ 5 x 10-28 kg/cm3

  5. KIMS Group

  6. Yangyang Underground Laboratory 襄阳地下实验室 (Upper Dam) Construction of Lab. buildings done in 2003 (Power Plant) (Lower Dam) Minimum depth : 700 m / Access to the lab by car (~2km)

  7. ~ 90 cm KIMS Detector ~90 cm 8cm x 8cm x 30cm 11x11 =121 crytals 1.05 t 30 cm

  8. Mineral oil 30cm Pb 15cm : 30t OFHC Cu 10cm : 3t

  9. 晶体、PMT、探测器单元 9269QA PMT CsI(Tl) 闪烁光双端读出

  10. Recent Results

  11. 5g Ge 1cpd A new project from KIMS Threshold: 100eV QF: 0.25 Ultra-low Energy threshold HPGe detector experiment

  12. THUNDER Project THUNDER: TsingHua UNderground Darkmatter Experimental Research Collaboration: Tsinghua University Seoul national University IoP of Academia Sinica

  13. Experimental Set-up Current weapon: 5g prototype Ge detector 16.94kg CsI(Tl) veto detector Location: Y2L @Korea Current lowest threshold: 500eV (CRESST)

  14. Threshold Background level Energy region: threshold(300eV) ~ 100keV Threshold: 300eV Average background level ~ 40 cpd Blue: after veto, Red: before veto Average veto efficiency ~ 60%

  15. Neutron Beam Testfor Quenching Factor

  16. New Plan for Lab Underground Lab. Space New Lab. space 40 m x 20 m = 800 m2 Current Lab. ~ 100m2

  17. New Plan: Detector Upgrade 20g detector (5g*4channels) next spring！ 1000g(Multi-channel Array) Mechanical design of large-N array

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