Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 49: Astroparticle Physics III

HK 49.5: Vortrag

Donnerstag, 17. März 2016, 15:30–15:45, S1/01 A02

Separation and Implantation of the Electron Capture Isotope ¹⁶³Ho for the ECHo Project — •Fabian Schneider for the ECHo collaboration — Institute für Physik und Kernchemie, Johannes Gutenberg-Universität Mainz

The ECHo collaboration aims at measuring the electron neutrino mass by recording the spectrum following electron capture of ¹⁶³Ho. To reach a sub-eV sensitivity, a large number of individual microcalorimeters is needed, into which the isotope must be implanted in a well controlled manner. The necessary amount of ¹⁶³Ho is produced by neutron irradiation of enriched ¹⁶²Er in the ILL high flux reactor. This introduces significant contaminations of other radioisotopes, which have to be quantitatively removed both, by chemical and mass spectrometric separation. The application of resonance ionization at the RISIKO mass separator guarantees the required isotope selectivity for purification and suitable energy for ion implantation. For optimum implantation into the detector pixels (170 × 170 µm²) with minimum losses, a small ion beam spot at the implantation site is needed. For this purpose, post focusing ion optics were installed and characterized. Furthermore, to reliably provide an ion beam with high ionization efficiency, the temperature distribution of the ion source was optimized based on results of finite-element analysis of the heat flow.