[en] The KARMEN neutrino experiment is taking data at the spallation neutron source ISIS at the Rutherford Appleton Laboratory in England. Its major aims are the search for neutrino oscillations and the investigation of neutrino-induced excitation of nuclei. ISIS provides three different kinds of neutrinos from the π⁺ decay (ν_μ) and from the subsequent μ⁺ decay ( anti ν_μ,νe). About 99.96% of these charged particles are stopped within the target material before they are decaying. Therefore the neutrinos have well defined energies, determined by the kinematics of the decay at rest. The spectrum includes energies between 0 and 52.8 MeV. The KARMEN detector detects neutrino reactions with 65 m³ of a liquid organic scintillator. In addition the ¹²C nuclei of the scintillator are used as reaction partner for the observed neutrino nuclei excitation. This thesis includes two parts. The first part describes the calibration of the detector data. Between 1992 and 1994 the concept of the calibration has been completely reworked and newly conceived in large parts. It includes all data, which are mainly composed of energy, position and time signals. The second part investigates neutrino reactions with ¹²C using a single prong analysis. The evlauation was made with neutrinos from muon decay. It includes the neutral current excitation of the ¹²C(15.11 MeV) level by anti ν_μandνe as well as the inclusive charged current excitation to ¹²N by ν_e. The cross section of the neutral current excitation has been determined. (orig.)