by
Prof.Loredana Gastaldo(Kirchhoff Institut für Physik, Universität Heidelberg)
→
Europe/Berlin
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Description
The goal of the Electron Capture in 163Ho (ECHo) experiment is the determination of the effective electron neutrino mass by the analysis of the electron capture spectrum of 163Ho. The detector technology is based on metallic magnetic calorimeters operated at about 10 mK in a reduced background environment. For the first phase of the experiment, ECHo-1k, the detector production has been optimised and the implantation process of high purity 163Ho source in large detector arrays has been refined. The implanted detectors have been successfully operated and characterised reaching an energy resolution below 5 eV FWHM. High statistics and high resolution 163Ho spectra have been acquired and analysed at the light of the new developed theoretical description of the spectral shape, considering the independently determined value of the energy available to the EC process, QEC. We present preliminary results obtained in a test phase of ECHo-1k and discuss the necessary upgrades towards the second phase of the experiment, ECHo-100k. In particular, we focus on the production of large arrays with 163Ho embedded in the absorbers and on the multiplexed readout.
