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E04-018 status report
Alexandre Camsonne
Hall A Jefferson Laboratory
Hall A collaboration meeting
December 13th 2007
Hall A collaboration meetingApril 10, 2023
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Outline
• He form factors
• Expected results
• Experimental setup He3/He4
• Update
• Conclusion
Hall A collaboration meetingApril 10, 2023
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Few body form factors
dd
Z 2 2 E
4E 3 sin4 / 2 A Q2 cos2 / 2 B Q2 sin2 / 2
A Q2 FC2 Q2 FM
2 Q2 1
B Q2 22FM2 Q2
Q2 4E E sin2 / 2 =Q2 / 4M 2
dd
Z 2 2 E cos2 / 2
4E 3 sin4 / 2 FC2 Q2
•He3 Form Factors
•He4 Form Factors
Hall A collaboration meetingApril 10, 2023
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He3 form factor expected results
Hall A collaboration meetingApril 10, 2023
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He3 Form Factor expected results
Hall A collaboration meetingApril 10, 2023
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He4 Form Factor expected results
Hall A collaboration meetingApril 10, 2023
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Hall A E04018
• Forward and backward measurement to separate the two form factors for He3
• High luminosity
• He3 and He4 measurement
• Use both HRS in coincidence to get elastic signal out of background background
– Time of flight
– Energy loss in scintillator
– Kinematical correlation
• Experiment complete on July 2007
• Analysis on going…
Experimental Details
• 20 cm long targets operated at 8K
• Beam current of up to 100 µA, corresponding to luminosity of 2.1038 nuclei/cm2/s
• Allowing cross section to be measured as small as 2.10-41 cm2/sr
• Beam energy from 0.7 to 4.4 GeV, covering Q2 from 1.5 (0.6) to 4 (5) GeV2 for 3He (4He) with 3 angle settings for Rosenbluth separation on 3He
• Scattered electron and recoiling nucleus detected in coincidence
Work in progress
Next projects
•TOF Corrections•Calorimeter Calibration•3-D VDC/Detector Track/Event Display•Monte Carlo Improvements•Computer Upgrade
•Cherenkov Gain Equalization corrections
•Detectors efficiencies
Hall A collaboration meetingApril 10, 2023
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Hall A collaboration meetingApril 10, 2023
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Raw time of flight
Hall A collaboration meetingApril 10, 2023
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Corrected time of flight
Hall A collaboration meetingApril 10, 2023
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Corrected time of flight
Hall A collaboration meetingApril 10, 2023
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Conclusion
•Still setting up for full analysis
•New computers ordered
•Full production by January 2008
•Preliminary results expected for summer 2008
