Abstract
A measurement of the cumulated beta spectrum from
235U fission products was performed with a magnetic spectrometer. The energy range 2.0–9.5 MeV was covered achieving a sensitivity of 3 x 10
−6 betas per MeV per fission in the high energy region. The absolute rates were calibrated with a precision of 3%. The beta spectrum was converted into the correlated
ν
e spectrum to provide a basis for antineutrino experiments at nuclear reactors.