The ratio of the electromagnetic proton elastic form factors, G(E)(p)/G(M)(p), has been measured at Jefferson Lab up to Q(2) approximate to 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(E)(p)/G(M)(p) up to Q(2) approximate to 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. (C) 2010 Elsevier Ltd. All rights reserved.
|Titolo:||Nucleon form factor studies at JLab|
|Data di pubblicazione:||2011|
|Appare nelle tipologie:||1.1 Articolo in rivista|