Abstract
The KARMEN experiment at the pulsed spallation neutron facility ISIS studies the charged and neutral current reactions 12 C ( v e , e − ) 12 N and 12 C( v , v′ ) 12 C * (1 + 1) in the astrophysical important energy range up to 50 MeV. Neutrinos are detected by a 56 ton high resolution liquid scintillation calorimeter with spectroscopic quality . Efficient background rejection results in clear neutrino signatures and allows reliable cross section measurements down to 10 −42 cm 2 . We present cross section results for v -induced reactions on carbon with special emphasis on their implications for neutrino astrophysics and weak nuclear formfactors and report a new flux-independent test of the equality of the couplings of v e and v̄ μ to the weak neutral current at low energies.
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