Limits on different Majoron decay modes of ${}^{100}$Mo and ${}^{82}$Se for neutrinoless double beta decays in the NEMO-3 experiment

Abstract

The NEMO-3 tracking detector is located in the Fréjus Underground Laboratory. It was designed to study double beta decay in a number of different isotopes. Presented here are the experimental half-life limits on the double beta decay process for the isotopes ${}^{100}$Mo and ${}^{82}$Se for different Majoron emission modes and limits on the effective neutrino-Majoron coupling constants. In particular, new limits on "ordinary" Majoron (spectral index 1) decay of ${}^{100}$Mo ($T_{1/2}>2.7\cdot 10^{22}$ y) and ${}^{82}$Se ($T_{1/2}>1.5\cdot 10^{22}$ y) have been obtained. Corresponding bounds on the Majoron-neutrino coupling constant are $<g_{ee}><(0.4-1.9)\cdot 10^{-4}$ and $<(0.66-1.7)\cdot 10^{-4}$.

23 pages includind 4 figures, to be published in Nuclear Physics A