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Dortmund 2006 – scientific programme

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T: Teilchenphysik

T 205: Neutrinos I

T 205.9: Talk

Tuesday, March 28, 2006, 16:00–16:15, HG2-HS6

The condensed 83mKr Calibration Source for KATRIN — •Matthias Prall — Institut für Kernphysik, Westfälische Wilhelms-Unversität, Wilhelm-Klemm Str. 9, D-48149 Münster

The KATRIN experiment relies on the stability of the retarding voltage of 3 ppm at 18.6 kV. KATRIN will apply this retarding voltage to a third retarding spectrometer, the ‘monitor’ spectrometer, with which a sharp and well-defined electron line will be measured frequently or continuosly. Several sources based on atomic and nuclear standards are under development. Our approach is the K-32 conversion line of 83mKr at 17.8 keV with a width of 2.9 eV. The half-life of 83mKr is 1.83h, therefore the reproducibility is the challenge. The 83mKr is frozen with possible noble gas underlayers as submonolayer onto a graphite substrate. We present a UHV set up with which we are able to produce thin films with high purity, measure their thickness with ellipsometry and transport 83mKr atoms towards the substrate. The set up cleans noble gases with cold and getter traps. The substrate is cleaned with pulses from a Q-switched laser. Our condensed 83mKr conversion electron source is currently being tested at the Mainz MAC-E Filter.

This work is supported by German Bundesministerium für Bildung und Forschung under contract 05CK5MA/0 and by the virtual institute VIDMAN of the Helmholtz Gemeinschaft.

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