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Giusa, A.; Bellini, V.; Mammoliti, F.; Russo, G.; Sperduto, M.L.; Sutera, C.M.; Cisbani, E.; Garibaldi, F.; Urciuoli, G.M.; Capogni, M.; Cates, G.D.; de Jager, K.; Wojtsekhowski, B.
Applied radiation and isotopes, 08/2011, Letnik: 69, Številka: 8Journal Article
The ratio of the electromagnetic proton elastic form factors, G p E / G p M , has been measured at Jefferson Lab up to Q 2 ≈ 9 ( GeV / c ) 2 , by using the CEBAF 6 GeV electron beam, and revealing an unexpected and challenging physical behaviour. The 2014 scheduled 12 GeV upgrade will allow the measurement of G p E / G p M up to Q 2 ≈ 15 ( GeV / c ) 2 , by taking advantage of the new large-acceptance forward spectrometer Super BigBite (SBS) in Hall A. Measurements of neutron form factors in the region around 10 (GeV/ c) 2, where quark confinement plays an important role, are expected to show the behaviour already observed in the proton case.
