Neutral Current Coherent Cross Sections -- Implications on Gaseous
  Spherical TPC's for detecting SN and Earth neutrinos
  The detection of galactic supernova (SN) neutrinos represents one of the
future frontiers of low-energy neutrino physics and astrophysics. The neutron
coherence of neutral currents (NC) allows quite large cross sections in the
case of neutron rich targets, which can be exploited in detecting earth and sky
neutrinos by measuring nuclear recoils. They are relatively cheap and easy to
maintain. The relevant NC cross sections are not dependent on flavor
conversions and, thus, their measurement will provide useful information about
the neutrino source. In particular they will yield information about the
primary neutrino fluxes and perhaps about the spectrum after flavor conversions
in neutrino sphere.They might also provide some clues about the neutrino mass
hierarchy. The advantages of large gaseous low threshold and high resolution
detectors with time projection counters (TPC) are discussed.
