Neutrino Mass Determination with the ECHo ExperimentHYBRID

In a time when the analysis of the mass distribution in the Universe would favor massless neutrinos, in contrast with what the existence of neutrino oscillations requires, the direct determination of the effective electron neutrino mass represents the strongest method to constrain the neutrino mass scale. This method consists in the analysis of the endpoint region of electron capture and beta decay spectra to identify tiny deviation in the spectral shape induced by the finite neutrino mass. The ECHo experiment is conceived for the determination of the effective electron neutrino mass through the analysis of the endpoint region of the Ho-163 electron capture spectrum. In ECHo, large arrays of metallic magnetic calorimeters enclosing Ho-163 are used for the high statistics and high energy resolution measurement of the Ho-163 spectrum. The ECHo-1k phase recently ended with the publication of the most stringent limit on the effective electron neutrino mass obtained using electron capture decays of m(v) < 15 eV at 90% C.I.. The detector system and the data analysis leading to these important results will be presented.

Presently the preparation of the hardware and upgrade of the analysis tools for the next phase of the experiment ECHo-LE are moving forwards. With ECHo-LE a sensitivity on the effective electron neutrino mass below 1 eV/c² will be reached, getting closer to the limit obtained with the tritium based experiment KATRIN m(v) < 0.45 eV at 90% C.L.. The technical challenges which need to be fulfilled for reaching this goal will be summarized.

https://gsi-fair.zoom.us/j/63856816325
Meeting-ID: 638 5681 6325
Passcode: AP_Seminar
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