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Nuclear Physics Seminars

ics Nuclear
Tuesday, February 24, 2004
3:30 PM
Physics Building, Room 204
Bodo Reitz [Host: Nilanga Liyanage]
Jefferson Lab
"Studies of Short-Range Correlations and Reaction Dynamic Effects in the 4He(e,e'p) Reaction"
ABSTRACT:
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.

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