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DS: Fachverband Dünne Schichten

DS 36: Postersession I

DS 36.43: Poster

Mittwoch, 22. März 2017, 17:00–19:00, P2-EG

Production of fully Au-embedded ¹⁶³Ho for Neutrino Mass Measurements — •Tom Kieck^1,2, Christoph Düllmann¹, Lisa Gamer³, Leonard Winkelmann², and Klaus Wendt² — ¹Institut für Kernchemie, Johannes Gutenberg-Universität Mainz, Germany — ²Institut für Physik, Johannes Gutenberg-Universität Mainz, Germany — ³Kirchhoff-Institut für Physik, Universität Heidelberg, Germany

The ECHo collaboration aims at measuring the electron neutrino mass by recording the spectrum following electron capture of ¹⁶³Ho using metallic magnetic calorimeters (MMC). The radioisotope ¹⁶³Ho has been produced from enriched ¹⁶²Er in a high flux nuclear reactor and has to be fully embedded into the 250 x 250 µm² MMC-absorbers with minimum losses [1].

The application of resonant laser ionization at the RISIKO mass separator guarantees optimum elemental and isotopic selectivity for ultra-pure ¹⁶³Ho ion implantation with a sub millimeter beam spot [2]. An in-situ deposition of gold using the technique of pulsed laser deposition (PLD) ensures a homogeneous ¹⁶³Ho/Au layer production as absorber of the MMC. In this way a saturation of the implantation-dose by sputtering effects is prevented and the targeted activity of 10 Bq per detector is achieved.

[1] Hassel et al., J. Low Temp. Phys. 184, 910-921 (2016)

[2] Schneider et al., NIM B 376, 388-392 (2016)