Physics – Medical Physics
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apsp.conf..209k&link_type=abstract
ASTROPARTICLE, PARTICLE AND SPACE PHYSICS, DETECTORS AND MEDICAL PHYSICS APPLICATIONS. Proceedings of the 10th Conference. Held
Physics
Medical Physics
Single Β-Decay, Neutrino Mass Determination, Calorimetric Detectors
Scientific paper
In the light of the recent cosmological discussion, the direct measurement of the lightest neutrino mass from single β-decay has become an important issue. Calorimetric low-temperature detectors measure the temperature rise induced by the energy deposition of the β-electron in an absorber of low heat capacity. It has been demonstrated in the past that observing the β-decay spectrum of 187Re provides a suitable method to determine the mass of the electron anti-neutrino from β-endpoint measurements. In a first step, with the experiments MANU and MIBETA a sensitivity of mve ≤20 eV/c2 was achieved. To compete with the sensitivity of mve ≤ 0.2 eV/c2 aimed at with the KATRIN experiment, a new experiment MARE has been initiated. As a first stage, MARE-I will reach a sensitivity of mve ≤ 2 eV/c2. With 300 detectors mounted, systematic effects of the calorimetric approach will be studied in detail. The second stage MARE-II will consist of several 10000 detectors and aim at a sensitivity of mve ≤ 0.2 eV/c2.
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