Physics at Virginia
Studying few-body nuclear targets in the (e,e'p) reaction is a powerful method to investigate specific aspects of the nucleus. The 4He nucleus is an especially interesting target since it has many of the ingredients of a complex, heavy nucleus, while as an A=4 system, microscopic calculations are still feasible. Making use of the high luminosity electron beam at Jefferson Lab together with the high resolution spectrometers in Hall A, Jefferson Lab Hall A experiment E97-111 has measured the 4He(e,e'p)3He cross section at recoil momenta up to~500 MeV/c in various kinematics. In plane-wave impulse approximation, many calculations predict a sharp minimum in the cross section for recoil momenta around 450~MeV/c and show that its location is sensitive to the short-range part of the internucleon potential. However, reaction dynamic effects such as final-state interactions and meson-exchange currents can obscure such a minimum. Measuring this cross section at various kinematical settings over the same recoil-momentum range gives the possibility to study these reaction dynamics effects. Preliminary results of this experiment will be presented, and will be compared to recent theoretical predictions.
Nuclear Physics Seminar
Tuesday, February 24, 2004
3:30 PM
Physics Building, Room 204
Note special room.

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