EXO/nEXO: Enriched Xenon Observatory
Searching for the neutrinoless double beta decay with EXO-200 and nEXO
In the search for the neutrinoless double beta decay, a hypothetical rare second order weak process, EXO-200 (Enriched Xenon Observatory) is one of the leading experiments, being the first experiment to observe the neutrino-accompanied double beta decay of 136Xe. This process is the best indicator considering the question whether or not the neutrino might be its own anti-particle. A detailed view of the detector can be found here. To reach a better sensitivity the successor experiment nEXO is under developement. The nEXO detector will be about 25 times the size of the current EXO-200 detector and it will be able to fully test the inverted mass hierachy. Further information on nEXO can be found here.
The EXO/nEXO Group
We do research on photon detection in nEXO, especially on characterization of Silicon Photomultipliers. These new semiconductor-based single photon sensitive detectors will replace the previously used Avalanche Photodiodes in EXO-200. Prior to their assembly in the final setup, they need to be tested, characterized and calibrated. We are also working on a test setup to liquify xenon. Concerning EXO-200, we will investigate the energy calibration procedure and the light and charge anti-correlation. The EXO/nEXO group is a working group of the Chair for Particle and Astroparticle Physics.