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HK: Fachverband Physik der Hadronen und Kerne

HK 45: Postersession

HK 45.2: Poster

Wednesday, March 16, 2016, 18:30–20:30, S1/05 22-24

The energy dependence of photon-flux and efficiency in the NRF measurement* — •Osman Agar^1,2, 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