The COBRA Experiment. Henric Krawczynski (Washington Univ. in St. Louis) for the COBRA Collaboration. Introduction to COBRA. CZT Detectors. Backgrounds & Sensitivity. Plans and Requirements. COBRA Collaboration (Zuber et al.). University of Sussex. University of Bratislava.
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Henric Krawczynski (Washington Univ. in St. Louis)for the COBRA Collaboration
University of Sussex
University of Bratislava
University of Warwick
University of Liverpool
Rutherford Appleton Lab.
University of Jyvaskyla
University of Birmingham
University of York
University of La Plata
University of Dortmund
Technical University Prague
Laboratori Nazionali del Gran Sasso
Washington University in St. Louis
Idaho National Laboratory
Observer status: University of Surrey (UK), University of Hamburg (Germany), Jagellonian University (Poland), Louisianna State University (USA), Technical University Dresden (Germany), Daresbury Laboratory (UK), Los Alamos National Laboratory (USA).
116CdDouble Beta Decay of 116Cd
116Cd Q-value: 2.809 MeV.
Natural 116Cd abundance: 7.49% 116Cd (+ 130Te?) enrichment.
F. Simkovic, ILIAS DBD meeting, Valencia 2006, see also:E. Caurier and J. Menendez and F. Nowacki and A. Poves, nucl-th/0709.2137
• Industrial development of CdZnTe detectors.
111cm3COBRA (Cadmium-Telluride O-neutrino double-Beta Research Apparatus)
Based on Arrays of CdZnTe
K. Zuber, Phys. Lett. B 519,1 (2001)
1.522cm36 cm3 = 35 gr.
Zhong, Krawczynski et al.
64 Detector Array at Gran Sasso National Laboratory:
64 detectors operational!
About 8 kg days (x2 more than published, T. Bloxham et al. Phys. Rev. C, 76, 025501 (2007)
Expected background index: 150 < 1 cts keV-1 kg-1 yr-1.
~3x10-7 counts/year/kg/keV in the crystals.
<1 neutron per year in 420 kg experiment.
D. Stewart et al., NIMA, 571, 651 (2007).Background Estimate
Simulations of external, internal, cosmogenic, and backgrounds: background index: 10-4-10-3cts keV-1 kg-1 yr-1.
1.3mm pixel pitch
50 m squares
Development of ≥0.5 cm thick detectors with 200 micron spatial resolution and multiplexed readout.
Next steps (continued R&D):
Towards a large-scale experiment: