Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 57: Neutrino physics 7
T 57.6: Talk
Wednesday, March 6, 2024, 17:15–17:30, Geb. 30.21: Gerthsen-HS
Activity of Ho-163 in wafer-scale implanted ECHo-100k chips — •Marta Kruhlik1, Arnulf Barth1, Sebastian Berndt2,3, Terese Buchta1, Holger Dorrer3, Christoph E. Düllmann3,4,5, Loredana Gastaldo1, Daniel Hengstler1, Nina Kneip2, Raghav Pandey1, Daniel Unger1, and Klaus Wendt2 — 1Kirchhoff Institute for Physics, Heidelberg University — 2Institute of Physics, Johannes Gutenberg-Universität Mainz — 3Department of Chemistry - TRIGA Site, Johannes Gutenberg-Universität Mainz — 4GSI Helmholtzzentrum Darmstadt — 5Helmholtz Institute Mainz
The primary objective of the ECHo collaboration is to determine the neutrino mass scale by analysing the endpoint region of the Ho-163 electron capture spectrum. To be sensitive to the effect of a finite neutrino mass on the spectral shape, high energy resolution and the acquisition of many Ho-163 events are mandatory. Using arrays of many MMCs to acquire the spectrum, an energy resolution better than 5 eV FWHM has already been demonstrated. For the ECHo-100k phase, more than 100 chips are planned, each comprising 64 detector pixels with an activity of around 10 Bq per pixel. An efficient production of these detectors requires the possibility to implant Ho-163 on the entire 3 inch wafer. A first test of the wafer-scale implantation has been performed using the RISIKO facility at Mainz University. We present the results obtained through the characterization of several pixels in three chips and discuss the determined activity and its homogeneity across a chip and the wafer. Then we conclude with a perspective on the fabrication of the required detectors for the ECHo-100k experiment.
Keywords: ECHo