![]() ![]() Based on the preparatory work and the presently on-going R&D in the research groups of ECHo we propose to establish a DFG Re-search Unit with the goal to achieve the required experimental conditions and the knowledge to be able to investigate the electron neutrino mass in the sub-eV range and to foster the collaboration between the groups involved. Detailed studies of the background and of meth-ods for its reduction will be carried out to increase the sensitivity of the calorimetric measurement. For the QEC measurements as well as for the calorimetric measurement of the 163Ho spectrum, high purity 163Ho sources will be produced. Independent measure-ments of the decay energy (QEC-value), for which different experiments cur-rently provide values ranging from 2.3 to 2.8 keV, will be performed using Penning-trap mass spectrometry. In the ECHo experiment, arrays of low tem-per-ature metallic magnetic calorimeters with high energy resolution and fast response time, having the 163Ho source embedded in the absorber, will be used to calorimetrically measure the EC spectrum. The Electron Capture 163Ho experiment, ECHo, is aimed at investigating the electron neutrino mass in the sub-eV range by means of the analysis of the calorimetrically measured energy spectrum following the electron capture process of 163Ho. Among them, experiments exploring the beta decay and electron capture processes of suitable nuclides can provide model-independent information on the electron (anti)- neutrino mass value purely using momentum and ener-gy conservation. Different approaches are fol-lowed to achieve a sensitivity on neutrino masses in the sub-eV range. The determination of the absolute scale of the neutrino masses is one of the major challenges of today’s particle physics. ![]()
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