Erlangen 2018 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 2: Laser Assisted Mass Spectrometry

MS 2.1: Hauptvortrag

Montag, 5. März 2018, 14:00–14:30, R 1.020

Production, Separation and Implantation of ¹⁶³Ho for Neutrino Mass Measurements — •Tom Kieck¹, Holger Dorrer¹, Christoph E. Düllmann^1,2, Klaus Eberhardt¹, Lisa Gamer³, Christian Enss³, Loredana Gastaldo³, Clemens Hassel³, Ulli Köster⁴, Christoph Mokry¹, Jörg Runke^1,2, Andreas Türler⁵, and Klaus Wendt¹ — ¹JGU, Mainz, Germany — ²GSI, Darmstadt, Germany — ³Heidelberg University, Heidelberg, Germany — ⁴ILL, Grenoble, France — ⁵PSI, Villigen and University of Bern, Bern, Switzerland

The ECHo collaboration aims at measuring the electron neutrino mass by recording the spectrum following electron capture of ¹⁶³Ho using metallic magnetic calorimeters (MMCs). The radioisotope ¹⁶³Ho is produced from enriched ¹⁶²Er in the ILL high flux nuclear reactor, chemically and mass spectrometrically separated and purified and is fully embedded into the 180x180 µm² Au-absorber of the ECHo MMCs. Resonance ionization at the RISIKO mass separator guarantees elemental and isotopic selectivity for ultra-pure ¹⁶³Ho ion implantation with a sub millimeter beam spot size. The performance of the laser ion source and the implantation process was improved to minimize sample losses. On-line in-situ deposition of Au using pulsed laser deposition (PLD) ensures homogeneous ¹⁶³Ho/Au layer formation in the implantation area. To verify the purity of the ECHo source material from production up to implantation and data taking a varity of different analytical techniques is applied, including γ-ray spectrometry, NAA, ICP-MS and RIMS.