Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 8: Neutrinophysik V

T 8.3: Vortrag

Montag, 19. März 2018, 16:35–16:50, Z6 - HS 0.001

Production, Separation and Implantation of ¹⁶³Ho for Neutrino Mass Measurements — •Klaus Wendt¹, Holger Dorrer¹, Christoph Düllmann^1,2, Klaus Eberhardt¹, Lisa Gamer³, Christian Enss³, Loredana Gastaldo³, Clemens Hassel³, Ulli Köster⁴, Christoph Mokry¹, Jörg Runke^1,2, and Andreas Türler^5,6 — ¹JGU, Mainz, Germany — ²GSI, Darmstadt, Germany — ³Heidelberg University, Heidelberg, Germany — ⁴ILL, Grenoble, France — ⁵PSI, Villigen, Bern, Switzerland — ⁶University of Bern, Bern, Switzerland

The ECHo collaboration aims at measuring the electron neutrino mass by recording the spectrum following electron capture of ¹⁶³Ho. For this purpose dedicated metallic magnetic calorimeters (MMCs) are used. The radioisotope ¹⁶³Ho is produced from enriched ¹⁶²Er in the ILL high flux nuclear reactor, separated and purified by chemical and laser mass spectrometric means for final embedding within the 180x180 µm² Au-absorber of the ECHo MMCs. Multi-step resonance ionization at the RISIKO mass separator ensures full elemental and isotopic selectivity for ultra-pure ¹⁶³Ho ion implantation with a well-controlled sub millimeter beam spot size. Performance of the laser ion source and the implantation process was improved to minimize sample losses. On-line in-situ deposition of Au by pulsed laser deposition (PLD) ensures homogeneous ¹⁶³Ho/Au layer formation during the implantation process. The quality of the ECHo source material is verified from production up to implantation and data taking using different analytical techniques, which include γ-ray spectrometry, NAA, ICP-MS and RIMS.