Abstract
An experimental set-up for simultaneous measurement of photoprotons and deexcitation gamma rays in the giant resonance energy region is used for evaluation of photoparticle cross sections leading to different levels of residual nuclei. The system consists of a scattering chamber with four silicon surface-barrier detectors, allowing measurement of photoproton spectra at 8 angles between 30° and 150°, inclusive, and a Ge(Li) coaxial detector assembly for analysing gamma rays from excited residual nuclei states. A least-squares method is adopted for the calculation of (γ, p) cross sections. Two types of data are used in the calculation: photoproton spectra of different bremsstrahlung end- point energies, and the deexcitation gamma-ray spectra. The latter enable selection of those states in residual nuclei which are strongly populated in the reaction, and consequently reduce the number of free parameters in the least-squares analysis. Typical cross sections are presented to illustrate the effectiveness of the method.
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