Darmstadt 2008 – wissenschaftliches Programm
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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 Zbořil1,3, Marcus Beck1, Jochen Bonn2, Otokar Dragoun3, Jaromír Kašpar3, Beatrix Ostrick1,2, Ernst-Wilhelm Otten2, Klaus Schlösser4, Thomas Thümmler1,4, 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.