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The NEMO-3 detector searches for the neutrinoless double beta; the obser vation of this process, beyond the Standard Model, would prove that the neutrino is a Majorana par ticle. The NEMO-3 detec- tor is a tracko-calo low-background detector : electron trajectories are reconstructed, then their energies are arrival times are mea- sured. It has taken data between 2003 and 2011. Preliminar y re- sults for the neutrinoless double beta decay of 82 Se and 100 Mo will be given. Results concerning the allowed process in the standard model, which is the double beta decay with 2-neutrino emission, will also be given for the different isotopes (100 Mo, 82 Se, 130 Te, 116 Cd, 96 Zr, 150 Nd, 48 Ca).
The NEMO experiment is investigating the neutrinoless double beta decay. The NEMO-3 detector is taking data in the Frejus Underground Laboratory. The goal of the SuperNEMO detector is to reach a sensitivity on the order of 10^26 year on the half-life of the ββ0ν process. The chosen isotopes for the future detector are ^82Se and ^150Nd, because of the reduced background. The collaboration has started a 3-year R& D developpement on all components : tracking detector, calorimeter, source enrichment and purification, radiopurity measurements.
The search of the double beta decay without neutrino emission is currently the only way to test the nature, Dirac or Majorana, of the neutrino. Two different experimental approaches exist: one, where source and detector coincide, is pure calorimetric (Germanium detectors like GERDA, MAJORANA, bolometer CUORICINO/CUORE, CdZnTe semi-conductors COBRA). In the other technique, before the measurements of their energies, the two electrons are tracked (tracking chamber and plastic scintillators for NEMO3/SuperNEMO and Xenon TPC for EXO). The results of the currently data-taking experiments (CUORICINO and NEMO3) are presented. The expected sensitivities for future experiments are discussed.
The NEMO-3 detector, which has been operating in the Frejus Underground Laboratory since February 2003, is devoted to searching for neutrinoless double beta decay ($\beta\beta 0 \nu$). The expected performance of the detector has been successfully achieved. Half-lives of the two neutrinos double beta decay ($\beta\beta 2 \nu$) have been measured for $^{100} Mo$, $^{82}Se$, $^{96}Zr$, $^{116}Cd$ and $^{150}Nd$. After 265 days of data collection from February 2003 until March 2004, no evidence for neutrinoless double beta decay ($\beta\beta 0 \nu$) was found from $\sim 7$ kg of $^{100} Mo$ and $\sim 1$ kg of $^{82} Se$. The corresponding lower limits for the half-lives are $3.5 \times 10^{23}$ years at 90\% C.L for $^{100} Mo$ and $1.9 \times 10^{23}$ years for $^{82}Se$. Limits for the effective Majorana neutrino mass are $< \hspace{-0....
The NEMO-3 experiment located in the Modane Underground Laboratory (LSM) is searching for neutrinoless double beta decay. The experiment has been taking data since 2003 with a range of isotopes. The main isotopes are ~ 7 kg of 100Mo and ~ 1 kg of 82Se. Since no evidence for neutrinoless double beta decay has been found, a 90% Confidence Level lower limit on the half-life of this process is derived. From this we determine an upper limit on the effective Majorana neutrino mass. New results using 150Nd, an isotope of special interest due to its potential use in future experiments, will also be presented. The data are also interpreted in terms of alternative models, such as weak right-handed currents or Majoron emission. NEMO-3 has also performed precision measurements of the standard model double beta decay process for several isotopes. M...
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