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An alpha-particle spectrometer has been assembled, consisting of an epitaxial 50 mum thick 4H silicon carbide detector connected to a gallium nitride HEMT used as input transistor of the front-end electronics. The depleted layer of the SiC diode detector was sufficient to stop all alpha particles of the used emitter in the 4.8-MeV to 5.8-MeV energy range. An excellent energy resolution of ~0.9% has...
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