Wuppertal 2015 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 94: Niederenergie Neutrinophysik VI

T 94.2: Vortrag

Donnerstag, 12. März 2015, 17:00–17:15, I.13.71 (HS 28)

Production and Purification of ¹⁶³Ho Sources for the ECHo Project — •Fabian Schneider for the ECHo collaboration — Institute für Physik und Kernchemie, Johannes Gutenberg-Universität Mainz

The ECHo collaboration uses the electron capture of ¹⁶³Ho for determing the mass of the electron neutrino. The calorimetric spectrum is recorded by metallic magnetic calorimeters and the neutrino mass is deduced by the analysis of the endpoint region of the spectrum in comparison to the decay Q-value. The required ¹⁶³Ho sample is produced by reactor activation of enriched ¹⁶²Er and is strongly contaminated by other radioactive isotopes which would produce unacceptable levels of background.

The most efficient way to produce isotopic pure sources in the detectors is a three step process of a chemical purification, electromagnetic mass separation and subsequent ion beam implantation. The RISIKO mass separator of the working group LARISSA is the ideal tool to perform the separation and implantation because it offers the advantage of a resonant ionization laser ion source. With this highly element-selective method and a dipole mass separation at 30 keV ion energy, a purity in the detectors can be reached with no coimplants beyond a fraction of 10⁻⁵ while maintaining a high efficiency in the process.