Abstract
The total photoabsorption cross section on a free proton was measured at the GRAAL facility in the energy range E γ = 600−1500 MeV. The large-aperture LAGRANγE detector and a liquid hydrogen target were used in the experiment performed with a back-scattered Compton gamma beam. To improve the accuracy, two alternative methods were employed. First, a subtraction method of using empty-target measurements allowed the cross section σ tot to be evaluated directly because of a low level of the electromagnetic background. Second, an algorithm for evaluating σ tot on the basis of summing the dominating partial cross sections was developed. Experimental results obtained for σ tot by the two methods are compared with existing data.
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