Discriminating neutrino mass models using Type II seesaw formula

In this paper we propose a kind of natural selection which can discriminate the three possible neutrino mass models, namely the degenerate, inverted hierarchical and normal hierarchical models, using the framework of Type II seesaw formula. We arrive at a conclusion that the inverted hierarchical model appears to be most favourable whereas the normal hierarchical model follows next to it. The degenerate model is found to be most unfavourable. We use the hypothesis that those neutrino mass models in which Type I seesaw term dominates over the Type II left-handed Higgs triplet term are favoured to survive in nature.Comment: No change in the results, a few references added, some changes in Type[IIB] calculation

Colour centres in LiF : Mg crystals

Deux types de centres H0 et un centre H- ont été trouvés par RPE et absorption UV dans le vide, dans des cristaux de LiF : Mg irradiés aux rayons X. Les centres appelés Z3 et Z2 dans LiF : Mg ne peuvent pas être identifiés à aucun centre Z, ils sont plutôt en connexion avec l'impureté OH.Two types of H0 centres and one H- centre were found by ESR and vacuum UV measurements in X-irradiated LiF : Mg. The so called Z3 and Z2 centres in LiF : Mg are not identical with any Z centre and are rather connected to the OH impurity