Abstract

The radiative proton capture reaction has been used to study the energy dependence of the El γ-ray strength function for A = 70–90 nuclei in the region between 6 and 10 MeV. Using a Ge(Li) detector, γ-ray spectra of primary radiative transitions have been measured in order to obtain γ-ray intensities averaged over many neighbouring resonances. The γ-ray strength functions were deduced for decay to the levels with well-known J π values. The values of the γ-ray strength function, in the energy region investigated, are well described by a Lorentzian curve extrapolated from the giant resonance region.

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