Karlsruhe 2024 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

T: Fachverband Teilchenphysik

T 57: Neutrino physics 7

T 57.6: Vortrag

Mittwoch, 6. März 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 Berndt^2,3, Terese Buchta¹, Holger Dorrer³, Christoph E. Düllmann^3,4,5, 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