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T: Fachverband Teilchenphysik

T 89: Niederenergie-Neutrinophysik 4

T 89.6: Talk

Wednesday, March 26, 2014, 18:05–18:20, P106

The Q-value of ¹⁶³Ho→¹⁶³Dy for the determination of the electron neutrino mass — •Andreas Dörr¹, Hendrik Bekker¹, Klaus Blaum¹, Michael Block², Christine Böhm^1,4, Christian Droese³, Christoph Düllmann^2,5, Klaus Eberhardt⁵, Sergey Eliseev¹, Mikhail Goncharov¹, Enrique Minaya Ramirez², Szilard Nagy¹, Yuri Novikov⁶, Julia Repp¹, Alexander Rischka¹, Vanessa Simon², and Sven Sturm¹ for the ECHo collaboration — ¹Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — ²GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany — ³Institut für Physik, Ernst-Moritz-Arndt-Universität, 17487 Greifswald, Germany — ⁴ExtreMe Matter Institute EMMI, Helmholtz Gemeinschaft, 64291 Darmstadt, Germany — ⁵Institut für Kernchemie, Johannes Gutenberg-Universität, 55128 Mainz, Germany — ⁶Petersburg Nuclear Physics Institute, 188300 Gatchina, Russia

The ECHo-collaboration aims at measuring the energy spectrum of the electron capture (EC) in ¹⁶³Ho by means of microcalorimetry with sub-eV sensitivity to obtain information about the electron neutrino mass. Precise and accurate knowledge of the Q-value of the EC decay ¹⁶³Ho→¹⁶³Dy is crucial for this experiment. The high-precision mass spectrometers SHIPTRAP at GSI and PENTATRAP at MPIK will perform Q-value measurements with uncertainties of ∼30 eV and <1 eV, respectively. Preliminary tests of a ¹⁶³Ho-ion source will be performed at the TRIGA-TRAP experiment in Mainz.The status of measurements at SHIPTRAP as well as the status of PENTATRAP, which is currently in the commissioning phase, will be presented.