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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Postersitzung

HK 34.20: Poster

Donnerstag, 13. März 2008, 14:00–16:00, Poster C3

Solid ⁸³Rb/^83mKr source for the KATRIN experiment — •Miroslav Zbořil^1,3, Marcus Beck¹, Jochen Bonn², Otokar Dragoun³, Jaromír Kašpar³, Beatrix Ostrick^1,2, Ernst-Wilhelm Otten², Klaus Schlösser⁴, Thomas Thümmler^1,4, Drahoslav Vénos³, and Christian Weinheimer¹ — ¹Institut für Kernphysik, Münster — ²Institut für Physik, Mainz — ³Nuclear Physics Institute of the ASCR, Řež/Prague, Czech Republic — ⁴Institut für Kernphysik, Forschungszentrum Karlsruhe

The KATRIN experiment aims at investigating the neutrino mass with an estimated sensitivity of 0.2 eV (90% C.L.). KATRIN will use a high-resolution spectrometer of MAC-E-Filter type for measuring the T₂-β-spectrum endpoint region. An unrecognized shift of the filter potential would influence the resulting neutrino mass. For the purpose of a continuous monitoring of the filter potential the high voltage will be also applied to an additional MAC-E-Filter. Together with this monitor spectrometer suitable electron sources based on atomic/nuclear standards are being developed. One good candidate is the solid ⁸³Rb/^83mKr source. It provides conversion electrons from ^83mKr which is continuously generated by the parent ⁸³Rb evaporated onto a backing. The monitoring task demands a long-term stability of the K-32 conversion electron line (energy of 17.8 keV, natural width of 2.8 eV) within the ppm region. The main features of the source will be outlined and the latest results of the K-32 long-term stability test measurements at the Mainz MAC-E-Filter will be presented. This work is supported by the DFG, BMBF and Czech Science Foundation.