The {y,n) and (y,2n) cross sections for Co 59 and V 51 have been measured, using nearly monochromatic photons obtained from the annihilation in flight of fast positrons. The integrated cross sections up to 28 MeV for

Energy spectra of electrons transmitted through targets of Be, Al, and Au were measured for incident electron energies of 4.0 and 8.0 MeV. The target thicknesses corresponded to ⅕ or ½ the range (calculated in the continuous slowing-down approximation) for the incident electron energy. Transmitted electron spectra were measured as a function of emission angle in the forward hemisphere using a magnetic spectrometer. Angular distributions and energy spectra are compared with results calculated with a Monte Carlo computer program (the NBS ETRAN-15 program). The calculations agree with the experimental data within the experimental error of measurement, except for the aluminum target where spectral comparison agree but there exists a normalization discrepancy. A spectral shift is observed in the data from a beryllium target.

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