Calculation of the antineutrino spectrum from thermal fission of 235U

The electron and antineutrino spectrum of the products of thermal fission of 235U have been calculated. The uncertainty in the shape of the spectra is < 5% in the range 2.5 <= E <= 7.5 MeV, as a result of a microscopic calculation of the beta decay schemes of neutron-rich fission products. Calculations of this type should give, as in the case of 235U investigated here, for arbitrary reactor fuel compositions a reliable basis for the interpretation of reactor anti ν oscillation experiments. (orig.)