The isospinstructure of the weak currents in exclusive neutrino reactions

The present work is based on neutrino experiment data with the Gargamelle bubble chamber in the broad band beam of the CERN protonsynchrotron. For the first time the reaction νn → νn π0 was separated from the π0-production at the proton. Besides, the reactions ν1H → μ-pπ+ could be separated at the free proton by means of kinematic techniques. However, about 80% of all reactions take place at the bound nucleons and this way the observed final state can be falsified by intranuclear secondary interactions. A correction of this falsification was made by means of a model calculation. By using recent nuclear physics data the model parameter could be calibrated and the correctness of the model calculation could be proved in all details. As a result the cross sections for the 1π-production could be given for free nucleons. The behaviour of these cross-sections was investigated in dependence of the invariant mass of the hadronic final state to find some clues of the isospinstructure of the weak currents. (orig./HSI)