, Jefferson Lab
[Host: Nilanga Liyanage]
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
Physics Building, Room 204
Note special room.
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