Dr. Thomas J. Bowles (Los Alamos National Laboratory)

Monday, March 17, 1997 at 4:00 pm in 144 Loomis

Where Have all the Neutrinos Gone? The Status of the Solar Neutrino Problem


The observed deficit of high-energy solar neutrinos in the chlorineexperiment of Davis has been known for 20 years and has beencorroborated by the Kamiokande water Cherenkov detector. Both of thegallium radiochemical experiments (SAGE and GALLEX) also observesignificant deficits of the total flux of solar neutrinos. While manyexplanations, related to both astrophysics and new particle physics,have been proffered, it seems that perhaps the most likely explanationis that new neutrino properties are likely the source of the deficit,indicating the existence of a finite neutrino mass. However, it isclear that another round of experiments involving model-independenttests are required to definitively resolve this question. Several newexperiments are either underway or in construction (includingSuperKamiokande, SNO, and Borexino) that should provide a resolution ofthe source of the solar neutrino problem.