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T: Fachverband Teilchenphysik
T 36: Neutrino physics without accelerators III
T 36.4: Vortrag
Dienstag, 31. März 2020, 17:45–18:00, L-2.004
Search for the two neutrino double beta decay 136Xe to an excited state of 136Ba — •Henning Schulze Eißing for the XENON collaboration — Institut für Kernphysik, WWU Münster, Germany
The XENON1T Dark Matter detector used a dual-phase time projection chamber with 2 tonnes of xenon monitored by photomultiplier tubes.
It is possible to reconstruct the energy and position of an interaction in the detector. A good energy resolution and the possibility to reconstruct events at MeV-energies in combination with a very low background rate allows the search for rare decays with XENON1T.
The two neutrino double beta decay of 136Xe to the ground state of 136Ba was measured by multiple experiments with a half life of about 2.16 x 1021 years . Beside the decay to the ground state, decays to excited states of 136Ba are possible, but not yet observed experimentally due to long expected half-lifes of about 1025 years. With the 1 t x year exposure of XENON1T multiple of these events could be found in the existing data.
This talk will outline steps necessary to search for this decay including a validation of MC simulations and the development of a machine learning discriminator to distinguish signal and background events.