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T: Fachverband Teilchenphysik
T 92: Neutrinomasse IV
T 92.9: Vortrag
Donnerstag, 3. März 2016, 18:50–19:05, VMP5 SR 0079
Optimization of metallic magnetic calorimeters with embedded 163Ho — •Ch. Fischer1, H. Dorrer2, Ch. E. Düllmann2, K. Eberhardt2, Ch. Enss1, A. Fleischmann1, L. Gastaldo1, C. Hassel1, D. Hengstler1, S. Hähnle1, K. Johnston3, S. Kempf1, T. Kieck2, M. Krantz1, U. Köster4, F. Schneider2, A. Türler5, M. Wegner1, and K. Wendt2 — 1Kirchhoff-Institut für Physik, Heidelberg — 2Johannes Gutenberg-Universität, Mainz — 3Physics Department CERN, Geneva — 4Institut Laue-Langevin, Grenoble — 5Laboratory of Radiochemistry and Environmental Chemistry, Paul Scherrer Institut, Villigen
The Electron Capture in 163Ho (ECHo) collaboration plans to reach sub-eV sensitivity on the electron neutrino mass by the analysis of high statistics of 163Ho electron capture spectra. Large arrays of metallic magnetic calorimeters (MMCs) with enclosed 163Ho read out using microwave SQUID multiplexing will be used for the measurement of the spectrum. With first prototypes of MMCs having the 163Ho source ion-implanted in the absorbers, operated at 25 mK, an energy resolution ΔEFWHM = 7.6 eV and a signal rise time τ = 130 ns have been achieved, paving the way to the first stage of the experiment (ECHo 1k). We present the optimization of MMCs and of the methods to embed the high purity 163Ho source in detector absorbers. In particular we discuss how to define the optimal activity per pixel considering the limits coming from the allowed unresolved pileup fraction and from the additional contribution of detector heat capacity related to the magnetic moments of 163Ho.