Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 48: Nuclear and Particle Astrophysics IV
HK 48.2: Vortrag
Donnerstag, 11. März 2004, 16:45–17:00, F
Calibration and long term monitoring of the KATRIN-Spectrometer with a condensed 83mKr Source — •Beatrix Müller — Helmholtz-Institut für Strahlen- und Kernphysik, Rheinische Friedrich-Wilhelms-Universität, D-53115 Bonn
The KATRIN-Experiment will investigate the mν_e by a precise measurement of the endpoint region of the tritium β spectrum with a sensitivity on mν_e of 0,2 eV. The measurement will be executed by an electrostatic filter supported by a magnetic guidance and momentum collimation of the β particles.
Due to the shape of the β spectrum any undetected fluctuation with σ (r.m.s.) of the analysing electrostatic potential will lead to a systematic shift of mν_e2 by −2 σ 2 . Therefore the exact knowledge of the electrostatic potential is crucial to the determination of the neutrino mass. A long term stability can only be monitored by use of an electron emitter with a nuclear or atomic standard. 83mKr emits a 2,9 eV broad K32-conversion electron line at 17825 eV (≈ endpoint region of the tritium β spectrum). A refreshable low temperature 83m Kr source is being developped in Bonn which is to detect fluctuations of the retarding potential of less than 70 meV. The source will be placed in a dedicated monitor spectrometer to allow a continuous monitoring of the retarding potential of the KATRIN main spectrometer.
A feasability study of the production of 83Rb was done at the Bonn cyclotron.
Supported by the BMBF under contract 05CK2PD1/5.