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T: Fachverband Teilchenphysik

T 105: Niederenergie-Neutrinophysik/Suche nach dunkler Materie II

T 105.1: Talk

Tuesday, March 29, 2011, 16:45–17:00, 30.95: 121

163-Ho electron capture decay: high precision measurement of the calorimetric spectrum — •Loredana Gastaldo, Philipp Ranitzsch, Falk von Seggern, Jan-Patrick Porst, Sönke Schäfer, Sebastian Kempf, Christian Pies, Andrea Kirsch, Andreas Fleischmann, and Christian Enss — Kirchhoff Institute for Physics, Heidelberg University, INF 227 69120 Heidelberg

Since few years the determination of the electron neutrino mass by the analysis of the calorimetric spectrum following the electron capture decay of 163-Ho has been revisited due to the excellent performance obtained by low temperature micro-calorimeters. We present the first high resolution calorimetric spectrum of 163-Ho obtained with low temperature Metallic Magnetic Calorimeters (MMC).MMCs work in a wide temperature range below 100 mK. They are based on a paramagnetic temperature sensor tightly connected to a particle absorber. In order to measure the calorimetric spectrum of 163-Ho, the radioactive isotopes were embedded in the absorber in a three step process including ion implantation at ISOLDE. With this technique a quantum efficiency larger than 99% is obtained. We discuss our results and show the implications on the planning of a future large scale experiment to measure the electron neutrino mass based on the calorimetric measurement of the 163-Ho electron capture spectrum.