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HK: Fachverband Physik der Hadronen und Kerne
HK 27: Poster
HK 27.39: Poster
Dienstag, 28. März 2017, 16:45–18:45, F Foyer
Search for double beta decay processes of 124Xe with XENON100 and XENON1T — •Alexander Fieguth for the XENON collaboration — Institut fuer Kernpyhsik WWU, Muenster, Deutschland
Driven by the search for dark matter particles the XENON collaboration installed its next stage multi-ton experiment XENON1T, which will probe the spin-dependent and spin-independent-WIMP-nucleon cross section, where for the latter a sensitivity down to 1.6x10−47cm2 will be reached. Adding to its main purpose different particle physics topics can be addressed. One example are double beta decay processes of the isotope 124Xe. It is expected to decay via two-neutrino double electron capture (2νECEC). Due to its Q-value of 2864keV the positron including processes 2vECβ+ and 2νβ+β+ are also allowed. With its fiducial mass of one ton, XENON1T will be the most sensitive detector for these decays to date and detection the 2vECEC and 2vECβ+ decays is within reach providing information on nuclear matrix element (NME) models. Within this work the search for 2νECEC has been carried out on 225 live days of XENON100 data setting a lower limit of 6.5x1020yr@90% C.I. for the half-life of this decay. Despite of not being competitive with the best limit >4.7x1021yr set by the XMASS-I experiment, it supersedes a published external analysis of this data. Moreover the possibilities of the running XENON1T experiment are studied by a simulation, which shows that it will be the most sensitive experiment for this decay channel. This work is supported by BMBF under contract number 05A14PM1 and DFG(GRK 2149).