Bonn 2010 – wissenschaftliches Programm
HK 28.5: Vortrag
Dienstag, 16. März 2010, 17:45–18:00, HG VI
Electron 83Rb/83mKr source for the energy scale monitoring in the KATRIN experiment — •Miroslav Zbořil1,3, Marcus Beck1, Jochen Bonn2, Otokar Dragoun3, Jaromír Kašpar3, Alojz Kovalík5, Beatrix Ostrick2, Ernst-Wilhelm Otten2, Klaus Schlösser4, Antonín Špalek3, Thomas Thümmler4, Drahoslav Vénos3, and Christian Weinheimer1 — 1IKP, Uni Münster — 2IP, Uni Mainz — 3NPI ASCR, Řež/Prague — 4IK, KIT Karlsruhe — 5DLNP, JINR Dubna
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 unrecognised 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=2.7 eV) of ± 1.5ppm/month. The main features of two source production techniques 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 MEYS Czech Republic (LA318 and LC07050).