Measurement of the deuteron electric and magnetic form factors at Jefferson Lab
The results from an experiment to measure the electric, A(Q{sup 2}), and magnetic, B(Q{sup 2}), form factors of the deuteron at large momentum transfers at the Jefferson Laboratory (JLAB) will be reported. The experiment performed elastic electron scattering from deuterium in coincidence; it has improved the quality of the existing data in the range of overlap and has significantly extended the Q{sup 2} range of the previous A(Q{sup 2}) SLAC data. The range in the squared four-momentum transfer, Q{sup 2}, is 0.7 to 6.0 (GeV/c){sup 2} for the A(Q{sup 2}) measurements and 0.7 to 1.4 (GeV/c){sup 2} for the B(Q{sup 2}) measurements. The measurements used the Continuous Electron Beam Accelerator and Hall-A Facilities of JLAB. Incident electron beams of energy 0.5 to 4.4 GeV and current 10 to 120{mu}A were scattered off a high power (500W) cryogenic deuterium/hydrogen target. Scattered electrons and recoiling deuterons were detected in coincidence using the two 4 GeV/c High Resolution Spectrometers (HRS) in Hall-A. Both HRS's used two planes of scintillators for triggering and timing and a drift chamber system for particle tracking. The electron HRS was also equipped with a gas Cherenkov counter and a lead-glass calorimeter for electron identification. Elastic electron-proton scattering in coincidence was used to calibrate the entire double-arm system. The results will be compared to conventional meson-nucleon physics calculations based on the impulse approximation with the inclusion of meson-exchange-currents, and to predictions of dimensional scaling quark models and perturbative quantum chromodynamics. They are expected to provide a crucial test of nuclear chromodynamics ideas and insights into the transition from the meson-nucleon to quark-gluon descriptions of the two-body nuclear structure.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 758563
- Report Number(s):
- JLAB-PHY-98-05; DOE/ER/40150-1719; TRN: US0003971
- Resource Relation:
- Conference: 16th European Conference on Few-Body Problems in Physics, Autrans (FR), 06/01/1998--06/06/1998; Other Information: PBD: 1 Jun 1998
- Country of Publication:
- United States
- Language:
- English
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