SAMOP 2023 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 9: Penning traps, highest precision, neutrino physics, storage rings, new facilities and approaches

MS 9.2: Vortrag

Freitag, 10. März 2023, 15:00–15:15, F128

Preparations for ¹⁶³Ho implantation into 3-inch wafers for ECHo — •Sebastian Berndt¹, Nikolas Bittner¹, Holger Dorrer¹, Christoph E. Düllmann^1,2,3, Raphael Hasse¹, Tom Kieck^2,3, Nina Kneip⁴, and Klaus Wendt¹ for the ECHo collaboration — ¹Johannes Gutenberg University Mainz — ²GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — ³Helmholtz Institute Mainz — ⁴Leibniz University Hannover

The "Electron Capture in ¹⁶³Ho" (ECHo) experiment aims at measuring the electron neutrino mass in the sub-eV range by the analysis of the calorimetrically measured energy spectrum following the electron capture process of ¹⁶³Ho. The radioisotope ¹⁶³Ho is produced from enriched ¹⁶²Er in the high-flux nuclear reactor at Institut Laue-Langevin (ILL) Grenoble in France. This production process is followed by chemical separation to remove all elements other than Ho and by mass spectrometric separation for removal of remaining trace amounts of ^166mHo. The ¹⁶³Ho is finally implanted into the absorbers of the ECHo Metallic Magnetic Calorimeters with high purity. Mass separation and implantation is performed in a single step at the RISIKO mass separator at University Mainz. For the scalability of the ¹⁶³Ho implantation from a single ECHo-100k chip with 64 absorbers to a 3-inch wafer with 40 ECHo-100k chips, the implantation region at RISIKO had to be adapted. A x-y stage and a Mapping Aperture Detector (MAD) were installed in the implantation chamber. The MAD is a wire detector with 8 wires that are read out individually to constantly monitor the size and position of the ion beam.