  A direction sensitive dark matter detector using organic crystals is being
developed. It exploits the anisotropic scintillation efficiency of organic
crystals with respect to the direction of nuclear recoils relative to
crystallographic axes. A variation of about 7% was observed in the
scintillation efficiency of carbon recoils in a stilbene crystal for recoil
energies of 30 keV to 1 MeV. We have performed a pilot experiment at Kamioka to
prove the feasibility of this method.

Astrophysics