A NOVEL NEUTRINO MASS HIERARCHY

Recent observations of solar neutrinos along with decades of data from the chlorine experiment seem to be converging on an explanation of the sun's neutrino deficit. Electron and muon neutrinos with Majorana masses approximately 10(-3) eV/c2 are subject to MSW suppression as they traverse the sun. However, Simpson's studies of beta-decay spectra show that nu-e mixes with a Dirac neutrino (presumably nu-tau) of a cosmologically nettlesome mass. We propose a simple modification of the singlet majoron hypothesis that accounts for these results yet remains in accord with known constraints from particle physics and cosmological theory. Maximal nu-tau oscillations into a sterile state are predicted.