Neutrino oscillation experiments have proved that neutrinos are massive particles but the assessment of their absolute\udmass scale is still an outstanding challenge in today particle physics and cosmology. The laboratory experiments dedicated\udto effective electron-neutrino mass determination are the ones based on the study of single beta decay or electron\udcapture (EC) decay. Exploiting only on energy-momentum conservation, this kinematic measurement is the only one\udwhich permits to estimate neutrino masses without theoretical assumptions on neutrino nature and it is truly modelindependent.\udTo date the most competitive isotopes for a calorimetric measurement of the neutrino mass are 187Re and 163Ho. While the first decays beta, the latter decays via electron capture, and both have a Q-value around 2.5 keV.\udThe measurement of 163Ho EC is an appealing alternative to the 187Re beta decay measurement because few nuclei are\udneeded and it is a self-calibrating measurement. In this context the MARE project, based on rhenium thermal detectors\udhas been born.\udWe report here the status of MARE in Milan with Rhenium and the activity concerning the production of radioactive\ud163Ho isotope in the framework of MARE.
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