1. 04/15/2009 | CALIFA Working Group Meeting | GSI, Darmstadt | Linda Schnorrenberger Measuring CsI Response Functions @ NEPTUN Feasibility test with Santiago’s ProtoZero L. Schnorrenberger 1, H. Alvarez-Pol 2, J. Benlliure 2, D. Cortina- Gil 2, I. Duran 2, M. Gascon 2, J. Glorius 1, D. Gonzales 2, B. Löher 1, N. Montes 2, N. Pietralla 1, D. Savran 1, V. Simon 1 und K. Sonnabend 1 1 Institut für Kernphysik, TU Darmstadt, Germany 2 Universidade de Santiago de Compostela, Spain Supported by BMBF (06 DA 9040 I), DFG (SFB 634) and LOEWE (HIC for FAIR) SFB 634

2. 18/03/2009 / 15:15 Uhr | Institut für Kernphysik, TU Darmstadt, Linda Schnorrenberger | 2  Photons are produced by the effect of bremsstrahlung  Idea: determine energy of electron to deduce photon energy  Conservation of energy: E  = E 0 - E e Principle of Photon Tagging 4 cm  Specifications E: 2-20 MeV  E: 25 keV @ 10 MeV E-window: 1-3 MeV 4 cm Focal Plane Detector array

3. 18/03/2009 / 15:15 Uhr | Institut für Kernphysik, TU Darmstadt, Linda Schnorrenberger | 3 ProtoZero  R 3 B @ FAIR: CALIFA 90° Prototype 13 cm

4. 18/03/2009 / 15:15 Uhr | Institut für Kernphysik, TU Darmstadt, Linda Schnorrenberger | 4 ProtoZero Single-Response Function  Two energy windows measured:  2.6 – 3.9 MeV  6.2 – 7.1 MeV  Coincidence spectra “fiber 70” – “PZ trigger” (60 ns gate)  (would have liked to choose center crystal as trigger) Scaled by 0.5! FE DE SE DE FE

5. 18/03/2009 / 15:15 Uhr | Institut für Kernphysik, TU Darmstadt, Linda Schnorrenberger | 5 Single-Response Function of Array 511 keV 2925 keV  beam spot on center crystals 6364 keV

6. 18/03/2009 / 15:15 Uhr | Institut für Kernphysik, TU Darmstadt, Linda Schnorrenberger | 6 Outlook / Improvements  Use trigger different from Mesitec shaper/cfd/timing module  Work on better collimated beam (now: 2-3 cm)  Test Addback response  Additional Energies  Comparison with GEANT4  … SFB 634 BMBF (06 DA 9040 I)