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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{-0.5mm} m_{\nu} \hspace{-0.5mm} > < ...
Recently we have proposed a mechanism for the magnetization and polarization of the vacuum (M. Urban et al., EPJ D, 2013). We have shown that the vacuum permeability and permittivity may originate from the magnetization and the polarization of continuously appearing and disappearing fermion pairs in vacuum. If we simply model the propagation of the photon in vacuum as a series of transient captures within these ephemeral pairs, we can derive a finite photon velocity equal to the velocity of its associated electromagnetic wave. Within this approach, the propagation of a photon is a statistical process at scales much larger than the Planck scale. Therefore we expect its time of flight to fluctuate. We predict time fluctuation of 50 attosecondper square root of meter. We will present current limits obtained from short Gamma Ray Bursts. We...
The observation of a neutrinoless double beta decay would be the proof that the neutrino is a Majorana particle, identical to its own anti-particle, and would correspond to a process violating the leptonic number. In this talk, I will give a review of the various experiments which are searching for a neutrinoless double beta decay.
We propose a quantum model for the vacuum filled of virtual particle pairs. The main originality of this model is to define a density and a life-time of the virtual particles. Compared to the usual QED $(p,E)$ framework, we add here the $(x,t)$ space time parameters. We show how $\epsilon_0$ and $\mu_0$ originate from the polarization and the magnetization of these virtual pairs when the vacuum is stressed by an electrostatic or magnetostatic field respectively. We obtain numerical values very close to the measured values. The exact equalities constraint the free parameters of our vacuum model. Then we show that if we simply model the propagation of a photon in vacuum as a succession of transient captures with virtual pairs, we can derive a finite velocity of the photon with a magnitude close to the measured speed of light $c$. Again t...
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