Saturation/Deviation of CoulombSum RuleS(q)Saturation of the Coulomb SumS,(@)>l at the sufficiently large qDeviation ofthe Coulomb Sumat small qC2krPauliblockingNucleon-nucleonlong-rangeCorrelationat large q (>>2Ke)Short-rangecorrelation~10%Modificationof thefree nucleonelectromagneticproperties insidethenuclear medium.One of the long lasting question in nuclearphysics
Saturation/Deviation of Coulomb Sum Rule Saturation of the Coulomb Sum S q L( ) 1 → at the sufficiently large q Deviation of the Coulomb Sum at small q Pauli blocking Nucleon-nucleon long-range Correlation at large q (>>2KF ) Short-range correlation ~10% Modification of the free nucleon electromagnetic properties inside the nuclear medium One of the long lasting question in nuclear physics
OverviewComprehensivemeasurementsoftheCoulomb sum at various labs for over 2o yearsLimitedrangeinqand550MeVIcAtBates(MIT)andSaclay(France)q·AtSLAC(Stanford)q=1140MeV/cCSR experiment (E05-110)at JLab·Coversaregion550MeVlc1000MeVlcq
Overview Comprehensive measurements of the Coulomb sum at various labs for over 20 years Limited range in q and At Bates(MIT) and Saclay(France) q 550MeV/c At SLAC(Stanford) q=1140MeV/c CSR experiment ( E05-110) at JLab Covers a region 550MeV/c q 1000MeV/c
Previous MeasurementsForthepasttwentyyears,alargeexperimentalprogramatBates,SaclayandSLACLimitedkinematiccoverageinqandduetomachinelimitations1.0H0R0.9XDIFe-0.80.70.60.50.420030040050012006001100qerr (MeV/c)Figure l:Su obtained in the EMA as a function of qeff using Saclay data com-binedwithSLACNE3andBatesdata.The5oFeSLACNE9result[i8](rightcross)andthatoftheJourdananalysis(star)arealso shown.Forthe curvesseethetext
Previous Measurements For the past twenty years, a large experimental program at Bates, Saclay and SLAC Limited kinematic coverage in q and due to machine limitations
Controversy on CSREarlydata showssignificantquenchingof theCSRWiththeadditionofforwardangledata,BatesclaimsnosignificantquenchingSaclay new analysisclaimsthat quenching persistsCa Bates23uBates"CaSaclay2spbSaclay1.0a10.8S0.60.4300400500300400500g (MeVle)q(MeV/c)
Controversy on CSR Early data shows significant quenching of the CSR With the addition of forward angle data, Bates claims no significant quenching Saclay new analysis claims that quenching persists SL (q)
2 .CSR Experiment (E05-110) at JLabCommissionedinearly1990sfirstexperimentin1994RecirculationArcsHighluminorsityelectronbeam:1039cm-2s-1High densitytargetMaximumcurrent200μAHeliumRefrigerator45-MeVInjector0.4-GeVLinac(2 1/4 Cryomodules)(20Cryomodules) The gain of each linac is adjustable400MeV-500MeVExtractionMaximumEnergy5.7GeVElementsEndStations
２.CSR Experiment (E05-110) at JLab Commissioned in early 1990s first experiment in 1994 High luminorsity electron beam:1039cm-2s -1 High density target Maximum current 200 μA The gain of each linac is adjustable 400MeV-500MeV, Maximum Energy 5.7GeV