Tests of physics beyond the Standard Model with future low energy neutrinoexperiments

Neutrino-electron scattering can be used to probe neutrino electromagnetic properties at low-threshold underground detectors with good recoil electron energy resolution. We study the sensitivity of Helium detector experiments , such as HELLAZ, for artificial anti-neutrino sources. We show that, for a Sr-90 - Y source, one expects a sensitivity to the neutrino magnetic momen t at the level of mu (nu) = 2 x 10(-11)mu (B). We also report the sensitivi ty that these experiments could have in searching for an additional gauge b oson in E-6 models.