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Measurement of the total photoabsorption cross section on a proton in the energy range 600–1500 MeV at the GRAAL

Author:
O. Bartalini   V. Bellini   J. P. Bocquet   P. Calvat   A. D’Angelo   J. -P. Didelez   R. Di Salvo   A. Fantini   F. Ghio   B. Girolami   M. Guidal   A. Giusa   E. Hourany   A. S. Ignatov   R. Kunne   A. M. Lapik   P. Levi Sandri   A. Lleres   D. Moricciani   A. N. Mushkarenkov   V. G. Nedorezov   C. Perrin   D. Rebreyend   F. Renard   N. V. Rudnev   T. Russew   G. Russo   C. Schaerf   M. -L. Sperduto   M. -C. Sutera   A. A. Turinge  


Journal:
Physics of Atomic Nuclei


Issue Date:
2008


Abstract(summary):

The total photoabsorption cross section on a free proton was measured at the GRAAL facility in the energy range Egamma=600-1500 MeV. The large-aperture LAGR ANgammaE 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 sigma tot to be evaluated directly because of a low level of the electromagnetic background. Second, an algorithm for evaluating sigma tot on the basis of summing the dominating partial cross sections was developed. Experimental results obtained for sigma tot by the two methods are compared with existing data.


Page:
75-82


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