[en] A bent crystal diffractometer for measuring γ-rays after thermal neutron capture, at the BR2 reactor is described. Generally speaking, such type of spectrometers finds still many applications in nuclear spectroscopy of either γ-rays or X-rays. This is primarily due to the better energy-resolution and precision which can be achieved for γ-energies below 1 MeV, as compared to the semiconductor-detectors. But to be fair, one must also add that Ge(Li)-detectors can measure a complete γ-spectrum simultaneously while a diffractometer has to scan the complete angular range corresponding to the different energies in many discrete steps, making the data-handling more elaborate. (author)