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Measurements reveal photoabsorption cross sections in various nuclei, indicating mass-number effects.
We present the results of an absolute measurement of the photoabsorption cross section on Li, C, Al, Cu, Sn, and Pb between 300-1200 MeV. In the ? region our result confirm that the strength is converted, while in the higher resonances region they show a 7-15% damping and a possible mass-number dependence of the photoabsorption cross section.
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M. et al. (1994) studied this question.
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