Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 45: Neutrino Physics III

T 45.1: Talk

Wednesday, March 18, 2026, 16:15–16:30, AudiMax

Upgrading the ECHo-1k experimental setup — •Margareta Chill for the ECHo collaboration — Kirchhoff-Institute for Physics

With the ECHo experiment, the effective electron neutrino mass can be determined via the high energy resolution measurement of the ¹⁶³Ho electron capture spectrum. In ECHo, large arrays of metallic magnetic calorimeters hosting ¹⁶³Ho are operated at millikelvin. For the ECHo-1k phase, two MMC arrays have been used for acquiring 200 million ¹⁶³Ho events with an energy resolution of about 7 eV FWHM at 1800 eV. For that experiment, only about one half of the channels could be read out due to failures in several SQUID channels. We present the upgrade of the ECHo-1k set-ups by the exchange of the SQUID read-out. We discuss the performance achieved with one of those set-ups and the implication for a coming small scale experiment aiming to reach a sensitivity on the effective neutrino mass below 5 eV/e².

Keywords: Neutrino Mass; Low Temperature Detectors; Quantum Sensors; Ho-163; Electron Capture