Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 75: Neutrino physics without accelerators VI

T 75.8: Talk

Thursday, April 2, 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.