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Measuring CsI Response Functions @ NEPTUN

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

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Measuring CsI Response Functions @ NEPTUN

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  1. Measuring CsI Response Functions @ NEPTUN Feasibility test with Santiago’s ProtoZero L. Schnorrenberger1, H. Alvarez-Pol2, J. Benlliure2, D. Cortina-Gil2, I. Duran2, M. Gascon2, J. Glorius1, D. Gonzales2, B. Löher1, N. Montes2, N. Pietralla1, D. Savran1, V. Simon1 und K. Sonnabend1 SFB 634 1Institut 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) 04/15/2009 | CALIFA Working Group Meeting | GSI, Darmstadt | Linda Schnorrenberger

  2. Focal Plane Detector array 4 cm 4 cm Principle of Photon Tagging • Photons are produced by the effect of bremsstrahlung • Idea: determine energy of electron to deduce photon energy • Conservation of energy: Eg = E0 - Ee • Specifications E: 2-20 MeV DE: 25 keV @ 10 MeV E-window: 1-3 MeV 18/03/2009 / 15:15 Uhr | Institut für Kernphysik, TU Darmstadt, Linda Schnorrenberger | 2

  3. 13 cm ProtoZero • R3B @ FAIR: CALIFA 90° Prototype 18/03/2009 / 15:15 Uhr | Institut für Kernphysik, TU Darmstadt, Linda Schnorrenberger | 3

  4. Scaled by 0.5! 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) DE SE FE DE FE SE 18/03/2009 / 15:15 Uhr | Institut für Kernphysik, TU Darmstadt, Linda Schnorrenberger | 4

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

  6. BMBF (06 DA 9040 I) SFB 634 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 • … 18/03/2009 / 15:15 Uhr | Institut für Kernphysik, TU Darmstadt, Linda Schnorrenberger | 6

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