Bolometric detection of neutrinos

Elastic neutrino scattering off electrons in crystalline silicon at 1--10 mK results in measurable temperature changes in macroscopic amounts of material, even for low-energy (<0. 41 MeV) pp 's from the sun. We propose new detectors for bolometric measurement of low-energy interactions, including coherent nuclear elastic scattering. A new and more sensitive search for oscillations of reactor antineutrinos is practical (100 Kg of Si), and would lay the groundwork for a more ambitious measurement of the spectrum pp, ^7Be and ^8B solar 's, and supernovae anywhere in our galaxy (10 tons of Si).