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Wuppertal 2015 – scientific programme

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T: Fachverband Teilchenphysik

T 94: Niederenergie Neutrinophysik VI

T 94.1: Talk

Thursday, March 12, 2015, 16:45–17:00, I.13.71 (HS 28)

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, aims to investigate 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. The 163Ho spectrum will be measured with array of low temperature metallic magnetic calorimeters (MMCs). With a first prototype of MMC having the 163Ho source embedded in the absorber, we performed the first high energy resolution measurement of the EC spectrum. The achieved energy resolution was Δ EFWHM=7.6  eV and the signal rise-time was τ = 130  ns. We aim to improve the performance of the detector to reach an energy resolution Δ EFWHM<5  eV and a signal rise-time τ < 100  ns. We present the plan for a medium scale experiment, ECHo-1k, in which about 1000 Bq of high purity 163Ho will be implanted in the optimized detectors. With about one year of measuring time and with a better knowledge of the EC spectral shape, which will be reached thanks to dedicated experiments, we will be able to achieve a sensitivity on the electron neutrino mass below 10 eV/c2, improving the present limit of about one order of magnitude.

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