Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 101: Neutrino Physics VIII

T 101.5: Vortrag

Freitag, 4. April 2025, 10:00–10:15, VG 3.103

Update on the ECHo Experiment — •Raghav Pandey — Kirchhoff Institute for Physics, Heidelberg University

In the ECHo experiment large arrays of low temperature metallic magnetic calorimeters (MMCs) enclosing Ho-163 are used for the high resolution measurement of the electron capture spectrum. The goal of the experiment is to achieve the sensitivity to detect an extremely small spectral shape distortion in the end point region due to a finite neutrino mass. The first phase, ECHo-1K was designed to test the properties and reproducibility of MMCs with implanted Ho-163 and the sensitivity to the effective electron neutrino mass. For 6 months between December 2019 and June 2020, Ho-163 events were acquired using about 50 MMC pixels enclosing about 1 Bq Ho-163 each. Data reduction methods were developed and applied on the acquired dataset. ’Quality Control’ parameters have been defined to track and quantify the effect of the data processing algorithms devised and the selection criteria invented to eliminate unsuitable data. A Ho-163 electron capture spectrum was compiled containing more than 2 × 10⁸ events and showing an energy resolution of 7.8 eV.

Keywords: Metallic Magnetic Calorimeter; Neutrinos; Low Temperature Detectors; Data Analysis