PreTeststands at MPI Munich Xiang Liu 1 2

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Pre-Test-stands at MPI Munich Xiang Liu 1) 2) 3) 4) Introduction to Canberra REGe

Pre-Test-stands at MPI Munich Xiang Liu 1) 2) 3) 4) Introduction to Canberra REGe detector Test A: Single- & double-photon escape Test B: Single- & multi-site events through coincidence Test C: Co 60 photons angular correlation

Canberra REGE detector Crystal inside Dewar Be window Reversed Germanium Detector Gerda Collab. ,

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

Resolution expected Xiang Liu, MPI München

REGe efficiencies 10% REGe 10 -2000 ke. V 1% 0. 1% 5 ke. V

REGe efficiencies 10% REGe 10 -2000 ke. V 1% 0. 1% 5 ke. V Xiang Liu, MPI München 1 Me. V

Test A: setup & simulation Co 60 Study single- double-escape events And back-splash events

Test A: setup & simulation Co 60 Study single- double-escape events And back-splash events Gerda Collab. , Jun 27 -29, 2005 Co 60 Page 2

Test A: Measured energy spectrum 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.

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

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 Co 60 photon with single-compton scattering

Test B: Single- & Multi-site event selection photon Co 60 photon with single-compton scattering at 90 has fixed energy. Gerda Collab. , Jun 27 -29, 2005 Page 2

Test B: Co 60 source Gerda Collab. , Jun 27 -29, 2005 Page 2

Test B: Co 60 source Gerda Collab. , Jun 27 -29, 2005 Page 2

Test B: Measured spectrum Esum = E_REGE 1+E_REGE 2 E_REGe 1 E_REGe 2 Gerda

Test B: Measured spectrum Esum = E_REGE 1+E_REGE 2 E_REGe 1 E_REGe 2 Gerda Collab. , Jun 27 -29, 2005 Page 2

Test. B: Esum=1173 or 1332 ke. V Esum=1173 Esum=1332 E_REGe 1 E_REGe 2 Xiang

Test. B: Esum=1173 or 1332 ke. V Esum=1173 Esum=1332 E_REGe 1 E_REGe 2 Xiang Liu, MPI München E_LEGe~360 ke. V Single Compton scattering 90 degree Single-site event

Test B: MC simulation Data & MC comparison, pulse shape: Kevin’s talk Gerda Collab.

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 Co 60 with the same distance at different angles.

Test C: Two REGe facing Co 60 with the same distance at different angles. Require coincidence trigger, measure the angular correlation of the two Co 60 photons. Gerda Collab. , Jun 27 -29, 2005 Page 2

Conclusion Many tests done with the REGe detector. ü Single- & double-escape photon events.

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