KamLAND-Zen Reports New Neutrino Mass Limit

The KamLAND-Zen collaboration (with Prof. Werner Tornow) reported in Phys. Rev. Lett. a new neutrino mass limit of  mββ   < (120 - 250) meV from a neutrinoless double-beta decay search of 136Xe. This limit is based on a range of representative nuclear matrix element calculations, and excludes the Majorana neutrino mass range expected from the neutrinoless double-beta decay claim of 76Ge by the Heidelberg-Moscow Collaboration at more than 97.5 % confidence level. Read the paper online here.