Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 45: Postersession
HK 45.2: Poster
Mittwoch, 16. März 2016, 18:30–20:30, S1/05 22-24
The energy dependence of photon-flux and efficiency in the NRF measurement* — •Osman Agar1,2, Udo Gayer1, Laura Merter1, Haridas Pai1, Norbert Pietralla1, Philipp Ries1, Christopher Romig1, Volker Werner1, Marcel Schillling1, and Markus Zweidinger1 — 1nstitut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany — 2Karamanoglu Mehmetbey University, Department of Physics, 70100 Karaman, Turkey
The calibration of the detector efficiency and the photon-flux distribution play an important role during the analysis of nuclear resonance fluorescence (NRF) measurements. The nucleus 11B is a frequently used calibration target with well-known photo-excitation cross sections. The product of photon flux and efficiency is determined exploiting γ-ray transitions of the 11B monitoring target. Photon-flux calibrations from numerous measurements at the superconducting Darmstadt electron linear accelerator (S-DALINAC) are carried out up to the neutron separation threshold, in order to obtain a system check of influences of absorbers on the flux, and to check against different GEANT models as well as parametrizations of the Schiff formula.
*Supported by the TUBITAK-BIDEB 2214/A Program and DFG under contract No. SFB 634