Samples of metallic silver and cerium-oxide have been irradiated with 3t MeV and 34 MeV bremsstrahlung. Relative yields of the induced activities have been obtained by counting the emitted gamma-quanta or by fi-counting. The yield ratio Y [Ag 1~ (y, n) Ag 1~ m]/y [Agl07 (y, 7r Ag 16~ g] for 34 MeV bremsstrahlung was found to be (0-08 -4-0.02). The corresponding ratio Y ICe a4~ (y, ~z) Celagm]/Y [Ce lt9 (y, n) Ce lagg] at 3t MeV was (0.t94-0.01).
The energy spectrum of photoprotons from 4He was investigated with 28 and 32,5 MeV bremsstrahlung using a CsI (T1)-spectrometer and a Si-counter. The (Tp)-cross section was derived for excitation energies from 23 to 32 MeV.
Photoproton spectra have been obtained from gaseous 180, ZONe, 22Ne, 36Ar, 4~ SaKr, Kr and Xe and from foils of Z3Na and K irradiated with bremsstrahlung from 24 to 32.5 MeV endpoint energy. The charged particles have been detected at 90 ~ to the y-beam by a Cs I(T1)-spectrometer with pulse shape discrimination. Yields and lower limits for the integrated cross sections are given. For argon and the heavier nuclei, the results are compared with statistical-model calculations.
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