,,,A reanalysis of the results of this experiment even suggest a mass in the range 0.2–0.6 eV, but this controversial claim is expected to be reexplored by the next generation of double beta decay experiments (such as CUORE). There are even projects to improve the sensitivity of
2β0ν down to mνe ∼ 10−2 eV, and we note that this is quite relevant since as we have seen, if neutrinos are indeed massive, it is somehow theoretically favored (e.g. in the see saw models) that they are Majorana particles.
It is remarkable that the mixing angle involved seems to be maximal, and this, together with the large mixing angle required in the solar sector, is giving fundamental information about the new physics underlying the origin of the neutrino masses, which seem to be quite different from what
is observed in the quark sector.