1 / 19

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

dinh
Download Presentation

The Heidelberg Dark Matter Search Experiment

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related