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" John C. Mather George F. Smoot COBE WMAP

5. Galactic Dark Matter Density of dark matter around the sun ~ 0.3 GeV /cm 3 ~ 5 x 10 -28 kg/cm 3 rotation velocity curve WIMP Recoiled nucleus Direct detection of galactic dark matter Recoil energy <100 keV Event rate < 1/kg/day

6. KIMS Group

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

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

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

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

12. Recent Results

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

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

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

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

18. Neutron Beam Test for Quenching Factor

19. Underground Lab. Space Current Lab. ~ 100m 2 New Lab. space 40 m x 20 m = 800 m 2 New Plan for Lab

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