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The Heidelberg Dark Matter Search Experiment

The Heidelberg Dark Matter Search Experiment. Laura Baudis Stanford University. The HDMS collaboration. MPI fuer Kernphysik, Heidelberg Group of Prof. H.V. Klapdor-Kleingrothaus. The HDMS detectors. WIMP. 2 HPGe detectors in one cryostat system inner: WIMP target outer: active veto

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The Heidelberg Dark Matter Search Experiment

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  1. The Heidelberg Dark Matter Search Experiment Laura Baudis Stanford University

  2. The HDMS collaboration MPI fuer Kernphysik, Heidelberg Group of Prof. H.V. Klapdor-Kleingrothaus

  3. The HDMS detectors WIMP • 2 HPGe detectors in one • cryostat system • inner: WIMP target • outer: active veto • against multiple Comptons • passive Ge shield gamma

  4. Some detector properties

  5. Cross talk between detectors linear correlation: correction offline kio = 0.00375 +/- 0.43 x 10-4 koi = 0.12850 +/- 0.27 x 10-3

  6. Cross talk induced error compare zero energy resolutions: inner: no effect outer: from 0.3% to 0.4% at 1332 keV

  7. The HDMS detector

  8. HDMS in Gran Sasso prototype: March 98-July 99

  9. Performance @ GS stable running over ~ 15 months individual runs ~ 0.9 d checked daily: leakage current nitrogen flow overall trigger individual count rate, etc weekly: calibration with 133Ba, 152Eu-232Th source

  10. Outer detector: 363 raw live-d 68Ge, 57Co, 58Co, 54Mn, 60Co, 65Zn, 137Cs, 238U, 232Th, 40K

  11. Inner detector: 363 raw live-d 68Ge, 54Mn, 57Co, 60Co, 210Pb, 212Pb, 214Pb, 40K

  12. Background model MC simulation of dominant backgrd. sources with extended GEANT3.21

  13. Inner: low energy spectrum 68Ga X-ray 49Ti, 55Mn cross talk?

  14. Structure at 32 keV: cross talk?

  15. Anticoincidence between inner and outer Eth for anticoincidence: 3 sigma away from zero 3s 1.2 keV 4.3 keV 40-100 keV: factor 4.3 11-40 keV: 0.2 events/kg d keV 40-100 keV: 0.07 events/kg d keV

  16. HDMS prototype limits only last 49 d of data taking: 9.9 kg d 2-30 keV: 0.5 events/kg y keV L. Baudis et al., PRD63,2000

  17. 73Ge-HDMS: full scale inner crystal replaced by 73Ge crystal sensitive to spin-dependent interactions 70Ge de-enriched by factor >50 new copper holder system no soldering of contacts installed in GS: August 2000 working well first analysis: fall 2001? expectation:test DAMA with independent technique and raw data

  18. HDMS goal Based on: 0.07 events/kg d keV in 2 - 30 keV region

  19. Conclusions HDMS prototype worked well limits competitive to other Ge experiments 73Ge-HDMS installed in August 2000 first 73Ge detector! first data to be analyzed soon... independent test of DAMA region sensitive to spin-dependent interaction however, increase of target mass improbable no sensitivity to a WIMP signature

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