Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 33: Poster Session II
A 33.32: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Redoutensaal
The Electron Capture in 163Ho experiment — •Clemens Hassel and THE ECHo COLLABORATION — Kirchhoff-Institute of Physics, Heidelberg University, Germany.
Direct determination of the electron neutrino (mνe) and anti-neutrino mass (mνe) can be obtained by the analysis of electron capture and beta spectra respectively. In the last years experiments analysing the 3H beta spectrum reached a limit on mνe of 2 eV. The upper limit on mνe is still two orders of magnitudes higher at about 225 eV. The Electron Capture in 163Ho experiment, ECHo, is designed to investigate mνe in the sub-eV region and reach the same sensitivity as foreseen for mνe in new 3H-based experiments. In ECHo, high sensitivity on a finite mνe will be reached by the analysis of the endpoint region in high statistics and high resolution calorimetrically measured 163Ho spectra. To perform this experiment, high purity 163Ho source will be enclosed in a large number of low temperature metallic magnetic micro-calorimeters which are readout using the microwave multiplexing technique. This approach allows for a very good energy resolution of below Δ EFWHM < 5 eV and for a fast time resolution well below 1 µ s. Thanks to the modular approach, the ECHo experiment is designed to be stepwise up-graded. The first on-going phase, ECHo-1k, is characterized by a 163Ho activity of about 1 kBq enclosed in about 100 pixels. The statistics of 1010 events in the 163Ho spectrum will allow to improve the limit on mνe by more than one order of magnitude. In this talk, the present status of the ECHo-1k experiment will be discussed as well as the plans for the next phase, ECHo-100k.