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HK: Fachverband Hadronen und Kerne

HK 39: Astroparticle Physics

HK 39.4: Talk

Tuesday, March 17, 2009, 17:30–17:45, H-ZO 70

Solid ⁸³Rb/^83mKr source for the KATRIN experiment — •Miroslav Zbořil^1,3, Marcus Beck¹, Jochen Bonn², Otokar Dragoun³, Jaromír Kašpar³, Alojz Kovalík⁵, Beatrix Ostrick^1,2, Ernst-Wilhelm Otten², Klaus Schlösser⁴, Antonín Špalek³, Thomas Thümmler⁴, Drahoslav Vénos³, and Christian Weinheimer¹ — ¹IKP, WWU Münster — ²IP, Mainz — ³NPI ASCR, Řež/Prague, Czech Republic — ⁴IK, FZK Karlsruhe — ⁵DLNP, JINR Dubna, Russia

KATRIN investigates the endpoint region of the T₂-β-spectrum aiming for a sensitivity on the neutrino mass of 0.2 eV (90% C.L.). A spectrometer of the MAC-E filter type will be used for a total time of at least 5 years. An unrecognized shift of the filtering potential would influence the resulting neutrino mass. To continuously monitor the filtering potential the high voltage will be simultaneously applied to an additional MAC-E filter spectrometer. In this monitor spectrometer suitable electron sources based on atomic/nuclear standards will be utilised. As one of such monitoring tools the solid ⁸³Rb/^83mKr source is intended. It provides conversion electrons from ^83mKr which is continuously generated by ⁸³Rb. The monitoring task demands a long-term energy stability Δ E / E of the K-32 conversion electron line (E=17.8 keV, Γ=2.8 eV) of 3 ppm. The main features of the source and the results of the K-32 long-term stability test measurements at the Mainz MAC-E filter will be presented. This work is supported by DFG (BO1212/5-1 and BO1212/6-1), BMBF (05A08PM1) and Czech Science Foundation (LA318 and LC07050).