JAMES P. HAYS-WEHLE, National Institute of Standards and Technology - Boulder: The measurement of the neutrino mass is still an open issue in nowadays particle physics. The smallness of this mass, and the difficulties in detecting neutrinos, make the measurement of this quantity a challenging experimental task. The direct measurements have set an upper limit of — 2 eV/c2, obtained independently by the Mainz and Troitsk collaborations with the spectrometric approach. In the near future the KArlsruhe TRItium Neutrino experiment (KATRIN) will lower the sensitivity of one order of magnitude, bringing the spectrometers to their technological limit. On the other hand, the calorimetric experiments aim to confirm, and in future further improve, the results coming from spectrometers. Nevertheless, in order to acquire enough statistics with calorimeters to push the sensitivity down below the eV/c2 by keeping the pile-up contribution as low as possible, the ideal detector should possess outstanding energy and time resolutions as well as a high multiplex factor. The HOLMES experiment's aim is to reach a sensitivity on the neutrino mass as low as — 0.4 eV by measuring the 'Ho end-point energy by mean of 1000 Transition Edge Sensors (TES). With this technology it is possible to achieve high energy resolutions in the energy range of interest for HOLMES (— 2-3 keV).

DATA: 16-07-2015