Wednesday 4 December 2013 Speaker: Pawel Guzowski (Manchester University) Title: "Latest results from NEMO-3 & Status of SuperNEMO" Abstract: The NEMO-3 and SuperNEMO experiments aim to search for neutrinoless double beta decay. If observed, this would show that the neutrino is its own antiparticle, and be the the first evidence of lepton number violation. The unique setup of the experiments, using a tracker-calorimeter technique, is able to measure the full kinematic signature of the decays. This will help in determining the underlying physical process behind neutrinoless double beta decay, once it is discovered. The NEMO-3 experiment took data from 2003 to 2011, with 7 kg of Mo-100 and 1 kg of Se-82 as the main double beta decay sources. It measured the world-leading values of the two-neutrino double beta decay half-lives for 7 isotopes. There were no neutrinoless double beta decays observed, with half-life limits set at 1.1x10^24 years for Mo-100 and 3.2x10^23 years for Se-82. The SuperNEMO experiment will improve on the NEMO-3 technique, using 100 kg of Se-82 source, and running under significantly lower background conditions with improved energy resolution. A half-life sensitivity of about 10^26 years (effective neutrino mass sensitivity of about 50 meV) can be achieved. A demonstrator module of the experiment is currently under construction, with data taking due to begin in 2015. I will be presenting the latest results from NEMO-3, including the newest Mo-100 limit which has been recently submitted for publication. I will also present the status of the SuperNEMO construction.