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Bonn 2020 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 75: Neutrino physics without accelerators VI

T 75.8: Vortrag

Donnerstag, 2. April 2020, 18:20–18:35, H-HS XIII

Development and optimisation of metallic magnetic calorimeter arrays towards ECHo-100k — •Federica Mantegazzini, Arnulf Barth, Christian Enss, Andreas Fleischmann, Loredana Gastaldo, Sebastian Kempf, Clemens Velte, and Tom Wickenhäuser for the ECHo collaboration — Kirchhoff-Institute for Physics, Heidelberg University, Germany

The Electron Capture in 163Ho (ECHo) experiment has been designed for the determination of the effective electron neutrino mass exploiting the electron capture spectrum of 163Ho. The detector technology is based on metallic magnetic calorimeters (MMCs) loaded with 163Ho and operated at millikelvin temperature. For the first phase of the experiment, ECHo-1k, MMC arrays consisting of 72 pixels have been microfabricated and implanted with high purity 163Ho source reaching an activity of about 1 Bq per pixel. For the next phase of the experiment, ECHo-100k, the planned activity per pixel is 10 Bq and the required number of pixels simultaneously operated will be 12000. Therefore, a new dedicated chip design has been prepared and microfabricated in order to improve detector performances, 163Ho implantation efficiency and to allow for parallel and multiplexed read-out. The detector geometry and the 163Ho host material have been studied in order to optimise the detector response and the energy resolution. An energy resolution of 2.9 eV FWHM can be reached under optimal read-out noise conditions. In this contribution we present the new ECHo-100k design and the first results from pulse shape analysis and detector caratherisation obtained with an external 55Fe source.

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