Pre-Test-stands at MPI Munich

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Presentation transcript:

Pre-Test-stands at MPI Munich Xiang Liu Introduction to Canberra REGe detector Test A: Single- & double-photon escape Test B: Single- & multi-site events through coincidence Test C: Co60 photons angular correlation

Canberra REGE detector Crystal inside Dewar Be window Reversed Germanium Detector Gerda Collab. , Jun 27-29, 2005 Page 2

Resolution expected Xiang Liu, MPI München

REGe efficiencies 10% REGe 10-2000keV 1% 0.1% 5keV 1MeV Xiang Liu, MPI München

Test A: setup & simulation Co60 Co60 Study single- double-escape events And back-splash events Gerda Collab. , Jun 27-29, 2005 Page 2

Test A: Measured energy spectrum Gerda Collab. , Jun 27-29, 2005 Page 2

Test A: Closed look at Measured SE: single escape, DE: double escape Gerda Collab. , Jun 27-29, 2005 Page 2

Test A: Simulated An improvement of simulation is undergoing. Gerda Collab. , Jun 27-29, 2005 Page 2

Test B: Single- & Multi-site event selection photon Co60 photon with single-compton scattering at 90 has fixed energy. Gerda Collab. , Jun 27-29, 2005 Page 2

Test B: Co60 source Gerda Collab. , Jun 27-29, 2005 Page 2

Test B: Measured spectrum Esum = E_REGE1+E_REGE2 E_REGe1 E_REGe2 Gerda Collab. , Jun 27-29, 2005 Page 2

TestB: Esum=1173 or 1332keV Esum=1173 Esum=1332 E_REGe1 E_LEGe~360keV Single Compton scattering 90degree Single-site event E_REGe2 Xiang Liu, MPI München

Test B: MC simulation Data & MC comparison, pulse shape: Kevin’s talk Gerda Collab. , Jun 27-29, 2005 Page 2

Test C: Two REGe facing Co60 with the same distance at different angles. Require coincidence trigger, measure the angular correlation of the two Co60 photons. Gerda Collab. , Jun 27-29, 2005 Page 2

Conclusion Many tests done with the REGe detector. Single- & double-escape photon events. Single- & multi-site events. Compared with MaGe MC simulations for verification. These REGe detectors will help to study the naked Ge crystals. Gerda Collab. , Jun 27-29, 2005 Page 2