Direct Dark Matter Searches and the EDELWEISS-II experiment

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! EDELWEISS-I Simple design: • 1 NTD heat sensor • 1 centre electrode • 1 guard ring • Limitation: surface events EDELWEISS detectors Not sufficient to reach 10 -8 pb Need ~2500 kgd at 15 keV threshold Need ~10 4 rejection for gammas Need to reject expected ~5000 % from 210 Pb March 11th, 2009 Moriond EW La Thuile - DM searches 20
EDELWEISS-II 210 Pb source calibration ! Response of detectors to this important background ! Detailed in-situ spectroscopy confirms interpretation of main bkg as 210Pb surface %. Edw-II 210 Pb ! Edw-I data 210 Pb % 210 Po 206 Pb & E=5.3 MeV Q~0.3 Edw-II 210 Bi % 210 Bi % 206Pb recoils coincident with 210Po & EDELWEISS-II 210 Pb source 210 Po & "Implantation depth of 210 Pb Edw-II March 11th, 2009 Moriond EW La Thuile - DM searches 21
Page 1 and 2: Direct Dark Matter Searches and the
Page 3 and 4: Supersymmetry naturally “predicts
Page 5 and 6: Prediction uncertainties ! WIMP mas
Page 7 and 8: Background philosophy ! Difference
Page 9 and 10: ! Best present Spin- Independent li
Page 11 and 12: ! Large mass of Xe (10 kg) + purifi
Page 13 and 14: Xenon-100 ! Evolution: larger, bett
Page 15 and 16: ! 17 x 300 g modules installed in G
Page 17 and 18: ! Charge measurements: centre and g
Page 19: ! … improve on EDELWEISS-I (2002)
Page 23 and 24: ! Gamma rejection of 400g • ~1 mo
Page 25 and 26: ! 93.5 kgd GeNTD • 11 detectors x
Page 27: ! Serious competition between prese

Direct Dark Matter Searches and the EDELWEISS-II experiment

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