Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 63: Poster Session: Cryogenic Particle Detectors and Cryotechnique

TT 63.9: Poster

Donnerstag, 4. April 2019, 15:00–18:30, Poster D

Effect of different host material for implantation of Ho-163 in metallic magnetic calorimeters — Martin Neidig, Benjamin Raach, Christian Enss, Andreas Fleischmann, •Loredana Gastaldo, Sebastian Velte, Federica Mantegazzini, and Clemens Velte — Kirchhoff Institute for Physics, Heidelberg University

The ECHo experiment has been designed for determining the value of the effective electron neutrino mass by the analysis of the endpoint region of the Ho-163 spectrum. The measurement of the Ho-163 spectrum is performed using low temperature metallic magnetic calorimeters (MMCs) with Ho-163 enclosed in the absorber. To achieve high sensitivity, detector performance as energy and time resolution are fundamental. In the process of optimizing MMCs for ECHo we have tested different materials for hosting Ho-163: gold, silver and aluminum. For that, high purity 163Ho has been implanted at Mainz University in three different MMC arrays having different implantation layers. We discuss the signal shape obtained with the different detectors as function of temperature as well as the energy resolution at the operating temperature of about 20 mK. In addition, we have also investigated if different host material could influence the decay mode for the electron capture in Ho-163. We present the comparison of Ho-163 spectra acquired with the different detectors and discuss the results at the light of available theories.