Measurement of the total photoabsorption cross section on a proton in the energy range 600-1500 MeV at the GRAAL
- Universita di Roma II Tor Vergata (Italy)
- Universita di Catania (Italy)
- Laboratoire de Physique Subatomique et de Cosmologie, IN2P3 (France)
- Institut de Physique Nucleaire d'Orsay, IN2P3 (France)
- INFN Sezione di Roma I (Italy)
- Russian Academy of Sciences, Institute for Nuclear Research (Russian Federation)
- INFN Laboratori Nazionali di Frascati (Italy)
The total photoabsorption cross section on a free proton was measured at the GRAAL facility in the energy range E{sub {gamma}} = 600-1500 MeV. The large-aperture LAGRAN{gamma}E 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}{sub tot} to be evaluated directly because of a low level of the electromagnetic background. Second, an algorithm for evaluating {sigma}{sub tot} on the basis of summing the dominating partial cross sections was developed. Experimental results obtained for {sigma}{sub tot} by the two methods are compared with existing data.
- OSTI ID:
- 21077569
- Journal Information:
- Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 1 Vol. 71; ISSN 1063-7788; ISSN PANUEO
- Country of Publication:
- United States
- Language:
- English
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