Eur. Phys. J. A (2004) 19: 165-169
https://doi.org/10.1140/epjad/s2004-03-027-7

Cold and hot nuclear matter

The ⁴He(e,e’p)³H reaction at JLab

Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA

Received: 5 September 2003
Published online: 12 February 2004

Abstract

In the recent experiment E97-111 at Jefferson Lab the unseparated cross section for the (e,e’p) reaction on ⁴He was measured at recoil momenta up to 530 MeV/c. In the 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. To distinguish and study these effects data were taken at several different kinematic points. The preliminary results of the experiment are presented and compared to recent model calculations.