The KARMEN experiment at the pulsed neutron facility ISIS is investigating neutrino--nucleus reactions and neutrino oscillations. In this paper we present cross sections for neutrino induced charged and neutral current reactions on 12C. These results allow a precision test of the standard model of weak interaction by imposing new limits on the neutral current isovector axial vector coupling strength \beta A, the strength parameter \rho measuring the universality of W\pm and Z0 coupling in the low energy regime and by investigating the Lorentz structure of muon decay. Neutrino oscillations \bar {\nu }\mu \rightarrow \bar {\nu }e are investigated in the appearance mode by looking for p(\bar {\nu }e,e+)n reactions. An analysis of 3 years running time with the KARMEN2 setup reveals no indication of an oscillation signal excluding most parts of the LSND oscillation evidence.
PACS numbers: 12.15.Mm, 13.15.+g, 14.60.Pq
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