Hannover 2010 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 7: Präzisionsmassenspektrometrie und Anwendungen II

MS 7.3: Vortrag

Donnerstag, 11. März 2010, 11:15–11:30, F 428

A new route for neutrino mass determination using the electron capture of 194HgDietrich Beck1, Klaus Blaum2,3, •Christine Böhm2,3, Martin Breitenfeldt4, Sergey Eliseev2, Valentin Fedoseev5, Sebastian George2, Frank Herfurth1, Alexander Herlert5, Magdalena Kowalska5, David Lunney6, Sarah Naimi6, Dennis Neidherr7, Yuri Novikov8, Stefan Schwarz9, Lutz Schweikhard4, Maxim Seliverstov5, and Kai Zuber101GSI, Darmstadt — 2MPI für Kernphysik, Heidelberg — 3Ruprecht-Karls-Universität, Heidelberg — 4Ernst-Moritz-Arndt-Universität, Greifswald — 5CERN, Genève — 6Université de Paris Sud, Orsay — 7Johannes Gutenberg-Universität, Mainz — 8PNPI, Gatchina, St. Petersburg — 9NSCL, MSU, East Lansing, Michigan — 10Technische Universität, Dresden

The electron neutrino mass is of highest importance for many fields of physics. To measure the neutrino mass, beta-decay spectra are typically used. Here an alternative way to determine the neutrino mass, using an electron capture in 194Hg will be presented. Direct mass measurements of 194Hg and its daughter nucleus 194Au were performed at the high-precision Penning trap mass spectrometer ISOLTRAP at the ISOLDE facility (CERN). The QEC-value obtained by the mass difference of these nuclei leads to the conclusion that the K-capture is forbidden, thus an L-capture is assumed. For further investigations a measurement using a cryogenic micro-calorimeter is suggested. From this, a de-excitation spectrum is obtained which can be compared to the QEC-value in order to determine the neutrino mass.

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