SuperNemo Article Swipe
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· 2016
· Open Access
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· DOI: https://doi.org/10.22323/1.244.0052
· OA: W4232702489
The NEMO-3 experiment performed precise measurement of the double beta decay and searched for the neutrino-less double beta decay on seven isotopes, among which 100 Mo and 82 Se were the dominant ones.The detector, installed in the Laboratoire Souterrain de Modane, took data for 8 years before being decommissioned in 2011.The key feature of NEMO-3 was its unique capability to fully reconstruct the kinematics of the events, which allowed to reduce the backgrounds and to discriminate among different mechanisms beyond the neutrino-less double beta decay.No evidence of 0νβ β has been found with an exposure of 34.3 kg×y of 100 Mo, providing a limit for the light Majorana neutrino mass mechanism of T 0νβ β 1/2 > 1.1 × 10 24 y (90 % C.L.) which corresponds to an effective neutrino mass of |m β β | < 0.33 -0.62 eV, depending from the NME considered.Furthermore, no background events in the double electron channel has been found in the energy region 3.2 -10 MeV after an exposure of 47 kg×y.The same experimental technique is adopted for the next generation experiment called SuperNEMO.The new detector has a modular design with the capability to measure different isotopes at the same time. 48Ca, 82 Se and 150 Nd are currently under consideration.With 20 detection modules observing for 5 years 100 kg of 82 Se, the expected sensitivity should reach T 0ν 1/2 > 10 26 y (|m β β | < 0.04 -0.10 eV), competitive with other experiments.In order to demonstrate the feasibility of the full experiment, the first step is the imminent construction of a first demonstrator module containing 7 kg of 82 Se.With an expected sensitivity of T 0ν 1/2 > 6.6 × 10 24 y (|m β β | < 0.2 -0.4 eV) after 2.5 y, the demonstrator module will also be able to perform a competitive measurement.
