Dark matter search with a Ge detector

A very low background Ge detector used to search for double beta decay has yielded new restrictions on candidates for cold dark matter particles in the halo of our galaxy. Particles with β = 10-3c with respect to the earth and having spin-independent interactions would scatter coherently from Ge nuclei. From the observed counting rate at low energies Dirac neutrinos constituting all of dark matter are excluded for masses between 12 GeV/c2 and 1.4 TeV/c2. Better limits are set on magninos (<11 GeV/c2) and cosmions (<9 GeV/c2), proposed massive particles which also explain the solar neutrino problem and which interact more strongly with Ge. In addition, millicharged shadow matter is ruled out as the main form of dark matter