David Wark

Abstract:

With the evidence for massive neutrinos from recent ν-oscillation experiments, one of the most fundamental tasks of particle physics over the next years will be the determination of the absolute mass scale of neutrinos, which has crucial implications for cosmology, astrophysics and particle physics. The KArlsruhe TRItium Neutrino (KATRIN) experiment is the next-generation direct neutrino mass experiment with a sensitivity to sub-eV ν-masses. It combines an ultra-luminous molecular windowless gaseous tritium source with a high resolution electrostatic retarding spectrometer (MAC-E filter) to measure the spectral shape of β-decay electrons close to the endpoint at 18.6 keV with unprecedented precision. If no neutrino mass signal is found, the KATRIN sensitivity after 3 years of measurements is mν < 0.2 eV/c2 (90 % CL.); a ν-mass signal of mν = 0.35 (0.30) eV/c2 can be measured with 5 (3) σ evidence.

Abstract:

The solar neutrino capture rate measured by the Russian-American Gallium Experiment on a metallic gallium target SAGE during the time from January 1990 through December 2000 is 77.0-6.2-3.0^+6.2+3.5 SNU, where the uncertainties are statistical and systematic, respectively. The experimental procedures and data analysis are presented. © 2002 MAIK. "Nauka/Interperiodica".