  An ab initio calculation of atomic ionization of germanium (Ge) by neutrinos
was carried out in the framework of multiconfiguration relativistic random
phase approximation. The main goal is to provide a more accurate cross section
formula than the conventional one, which is based on the free electron
approximation, for searches of neutrino magnetic moments with Ge detectors
whose threshold is reaching down to the sub-keV regime. Limits derived with
both methods are compared, using reactor neutrino data taken with low threshold
germanium detectors.
