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T: Fachverband Teilchenphysik

T 69: Neutrinomasse III

T 69.1: Gruppenbericht

Mittwoch, 2. März 2016, 16:45–17:05, VMP5 SR 0079

The Electron Capture in ¹⁶³Ho experiment — •Clemens Hassel for the ECHo collaboration — Kirchhoff-Institute of Physics, Heidelberg University, Germany.

The Electron Capture ¹⁶³Ho experiment, ECHo, has the goal to probe the electron neutrino mass on a sub-eV level via the analysis of the calorimetrically measured electron capture spectrum (EC) of ¹⁶³Ho.

For this metallic magnetic calorimeters will be used. The performance achieved by a first prototype of MMC with embedded ¹⁶³Ho already shows that the desired values of an energy resolution of ΔE_FWHM < 3 eV and a signal risetime of τ < 1 µs for ECHo can be reached.

Recently the energy available for the decay Q_EC= 2833(30_stat)(15_sys)
eV/c² has been precisely determind by ECHo. Given this Q_EC-value we expect a sensitivity on the electron neutrino mass below 10 eV in the first phase of the ECHo experiment, ECHo-1k. In this phase a high purity ¹⁶³Ho source with a total activity of 1 kBq will be measured by about 100 detectors operated in a dedicated cryogenic platform in a reduced background environment. The results from this experiment will define parameters to scale the experiment to the next phase of ECHo-1M. There the total activity of the source will be 1 MBq and it will be measured by using 10⁵ detectors. We present the current status of the ECHo experiment.