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T: Fachverband Teilchenphysik

T 2: Neutrino Physics I

T 2.1: Vortrag

Montag, 16. März 2026, 16:15–16:30, AudiMax

Status Report on the ECHo Experiment — •Raghav Pandey for the ECHo collaboration — Kirchhof Institute for Physics, INF 227, Heidelberg 69120

The analysis of the endpoint region of β-decay or electron capture decay spectra is a model independent method for the determination of the effective electron (anti-)neutrino mass. The ECHo collaboration aims to achieve this goal by preparing a high energy resolution and high statistics measurement of the electron capture spectrum in ¹⁶³Ho. This experiment uses Metallic Magnetic Calorimeters enclosing samples of the ¹⁶³Ho source. The first phase of the experiment — called ECHo-1k — has been completed with the publication of the best limit on the effective electron neutrino mass obtained from ¹⁶³Ho, m_νe < 15 eV (90% C.L.).

We present the results obtained in the ECHo-1k experiment and discuss the development of the next phase of ECHo, the ECHo-LE (Large Experiment). In ECHo-LE, 20000 MMC detectors will be read out using a microwave SQUID multiplexing scheme with the goal of acquiring 10¹³ events at a high energy resolution. The achievement of such a spectra allows for a sub-eV sensitivity on the effective electron neutrino mass.

Keywords: Neutrino Mass; Low Temperature Detectors; Metallic Magentic Calorimeters; Microwave Multiplexing; Quantum Sensors