Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 75: Neutrino physics without accelerators VI

T 75.1: Group Report

Thursday, April 2, 2020, 16:30–16:50, H-HS XIII

The Electron Capture in ¹⁶³Ho Experiment — •Arnulf Barth for the ECHo collaboration — Kirchhoff Institute for Physics, Heidelberg University

The goal of the Electron Capture in ¹⁶³Ho (ECHo) experiment is the determination of the electron neutrino mass by analyzing the electron capture (EC) spectrum of ¹⁶³Ho . Metallic magnetic calorimeters operated at low temperatures, in which the ¹⁶³Ho has been implanted, present the best performance to conduct a high resolution and low background calorimetric measurement of the ¹⁶³Ho EC spectrum. During the first phase of the experiment, ECHo-1k, the detector production and the implantation process of a high purity ¹⁶³Ho source have been optimized. Additionally, large detector arrays have been developed, reaching an energy resolution below 5 eV and featuring an activity of about 1 Bq per pixel. High statistics and high resolution ¹⁶³Ho spectra have been acquired and analyzed in light of the newly developed theoretical description of the spectral shape, considering the independently determined value of the energy available to the EC process, Q_EC , and a dedicated background model. In this contribution, we present preliminary results obtained in the first phase of ECHo. At the same time, we discuss the necessary upgrades towards the second phase of the experiment, ECHo-100k.