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T: Fachverband Teilchenphysik
T 116: Niederenergie-Neutrinophysik 5
T 116.1: Talk
Thursday, March 27, 2014, 16:45–17:00, P106
Production of radiochemically pure Ho-163 sources for the ECHo experiment — Klaus Eberhardt1,2, •Christoph E. Düllmann1,2,3, Holger Dorrer4, Andreas Türler4,5, Ulli Köster6, and Loredana Gastaldo7 for the ECHo collaboration — 1Johannes Gutenberg-Universität Mainz, Mainz, Germany — 2Helmholtz Institut Mainz, Mainz, Germany — 3GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — 4Paul Scherrer Institut, Villigen, Switzerland — 5Universität Bern, Bern, Switzerland — 6Institut Laue-Langevin, Grenoble, France — 7Universität Heidelberg, Germany
With the "Electron Capture Ho-163" (ECHo) experiment, the mass of the electron neutrino will be investigated in the sub-eV range by means of the analysis of the calorimetrically measured energy spectrum following the electron capture process of Ho-163. For this, radiochemically pure Ho-163 samples containing about 1E19 atoms are required. We present the production possibilities, the undesired impurities co-produced in the different production pathways, and their removal employing chemical (for separation of impurities of elements other than Ho) as well as physical (mainly to remove traces of Ho-166m) separation methods. This allows for the production of Ho-163 sources which are suitable for the colorimetric measurements of the electron capture spectrum as well as for the precise measurement of the Ho-163 mass by means of Penning traps to obtain a high-precision Q-value for the EC decay of Ho-163.