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T: Fachverband Teilchenphysik
T 89: Niederenergie-Neutrinophysik 4
T 89.7: Vortrag
Mittwoch, 26. März 2014, 18:20–18:35, P106
Calorimetric measurement of the Ho-163 spectrum: from single pixels to arrays — •Philipp C.-O. Ranitzsch1, Clemens Hassel1, Mathias Wegner1, Sebastian Kempf1, Andreas Fleischmann1, Christian Enss1, Karl Johnston2, Thierry Stora2, Klaus Eberhardt3, Christoph E. Duellmann3, and Loredana Gastaldo1 for the ECHo collaboration — 1Kirchhoff Institute for Physics, Heidelberg University, Heidelberg, Germany — 2CERN, Physics Department, 1211 Geneva 23, Switzerland — 3Institute for Nuclear Chemistry, Mainz University, Mainz Germany
Low temperature metallic magnetic calorimeters (MMCs) are used within the Electron Capture Ho-163 experiment ECHo to perform the calorimetric measurement of the Ho-163 electron capture spectrum. With the first prototypes of MMCs, where the Ho-163 source was ion-implanted at ISOLDE-CERN, we were able to measure the presently most precise Ho-163 spectrum with an energy resolution of 7.6 eV (FWHM) and a signal rise-time of about 100 ns. We have recently produced a 64-pixels chip consisting of two 32-pixel arrays read-out using the microwave multiplexing technique. Two of these chips will be equipped with Ho-163 by ion-implantation at ISOLDE in 2014. We show the detector design, in particular the embedding of the Ho-163 source in the detector absorber. We present recent measurements of the Ho-163 spectrum where for the first time the OI-line was resolved and the results of the first tests performed on the 64-pixel chips. We discuss the achieved performance of single pixels and of the multiplexing technique in relation with the requirements for the ECHo experiment.