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T: Fachverband Teilchenphysik
T 75: Neutrino physics without accelerators VI
T 75.10: Vortrag
Donnerstag, 2. April 2020, 18:50–19:05, H-HS XIII
Status of the 163Ho Source Preparation for the ECHo Neutrino Mass Experiment — •Nina Kneip1, Holger Dorrer1, Christoph E. Düllmann1,2,4, Tom Kieck1,4, Ulli Köster3, and Klaus Wendt1 — 1Johannes Gutenberg University Mainz, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH Darmstadt, Germany — 3Institut Laue-Langevin, Grenoble — 4HIM Johannes Gutenberg University Mainz, Germany
The ECHo collaboration addresses the determination of the electron neutrino mass by recording the deexcitation spectrum following the electron capture of 163Ho. This nuclide is produced by neutron irradiation of enriched 162Er in the ILL high flux reactor. The Ho fraction is then chemically separated. Isotope separation and implantation into the 0.18 mm x 0.18 mm Au-absorbers of the metallic magnetic calorimeters is performed at the RISIKO mass separator at JGU Mainz. This facility consists of a pulsed Ti:sapphire laser system for highly efficient laser resonance ionization, installed at the 30 kV sector field magnet mass separator. The combination of laser ionization and mass spectrometry allows for exceptional elemental and isotopic selectivity leading to a high purity 163Ho beam for ion-implantation process. A submillimeter beam diameter ensures minimal losses of the precious 163Ho source material. In parallel to ion implantation, in-situ deposition of Au onto the implantation area is performed by pulsed laser deposition, counteracting the losses of absorber material by sputtering process during implantation.