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Développement de calorimètres métalliques magnétiques pour le spectrométrie bêta

Cindy Le Bret 1
1 LNHB - Laboratoire National Henri Becquerel
DM2I - Département Métrologie Instrumentation & Information : DRT/LIST/DM2I
Abstract : The aim of this thesis is to demonstrate the potential of metallic magnetic calorimeters for beta spectrometry by measuring the spectrum of 63-Ni. This nuclide is one of the beta emitters for which theory is well-known and calculation reliable. We propose a method for experimental observation, especially at low energies, which allows to validate the theoretical calculation.A dedicated data analysis has been established and optimized. It takes into account the parameters of a cryogenic measurement and also the specific requirements of beta spectrometry. Two types of sources have been realized, a deposit of nickel salt from a dried drop of a solution of NiCl2 and a metallic electroplated source of Ni. The electroplated sources turn out to be the appropriate type of source for 63-Ni spectrometry.The performances of metallic magnetic calorimeters, such as high detection efficiency and low energy threshold, lead to results precise enough to validate experimentally the theory.
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Submitted on : Wednesday, October 10, 2012 - 11:22:10 AM
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Cindy Le Bret. Développement de calorimètres métalliques magnétiques pour le spectrométrie bêta. Instrumentations et Détecteurs [physics.ins-det]. Université Paris Sud - Paris XI, 2012. Français. ⟨NNT : 2012PA112149⟩. ⟨tel-00740438⟩

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