Abstract
The CEA/LNHB is responsible for the determination and publication of atomic and nuclear data such as X-ray and gamma ray emission probabilities. In order to reduce uncertainties on the determination of these data, a high energy resolution associated with a good intrinsic detection efficiency is required. Hence taking into account these two aspects, we are developing cryogenic detectors, especially metallic magnetic calorimeters (MMCs) for photon spectrometry from few keV up to 200 keV. A MMC using a meander pick-up coil made of niobium thin films has been optimized. The gold absorber (diameter: 1.1 mm, thickness: 335 μm) has an intrinsic detection efficiency larger than 70% for photons from few keV up to 100 keV. From an energy spectrum obtained with a 133Ba multi-gamma source, we have characterized this first detector. The energy resolution is 320 eV and 560 eV respectively at 30 keV and 357 keV. Possible improvements of the performance of the detector are discussed.
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