In nuclear photon scattering experiments, high-energy photon beams are used to excite nuclear states whose decay in the form of γ-rays can subsequently be measured with suitable detectors. In order to determine absolute measured quantities, it is necessary to know the intensity of the exciting photon beam.

Recently, an experiment was performed at the High Intensity γ-ray Source (HIγS) at the renowned Duke University in the USA. The facility generates a monoenergetic photon beam that was used to populate nuclear states at different excitation energies. The photon flux was measured in three different ways:

1) by Compton scattering of the beam at a well-defined scattering center, 2) by a uranium-238 fission chamber placed in the path of the beam, and 3) using a plastic scintillator also placed in the beam. All three measurement setups and methods provide information on the intensity of the photon beam.

In this bachelor thesis, the data from the three setups will be analyzed and compared qualitatively as well as quantitatively to determine the course of the photon flux for each series of measurements. The results of this work will thus allow the determination of absolute reaction cross sections.