Momentum transfer dependence of medium effects in the (e,e{prime}) longitudinal response

摘要

Recent {sup 56}Fe(e,e{prime}) data at momentum transfer {vert_bar}{bar q}{vert_bar} = 1.14 GeV displays behavior which is qualitatively different from that of lower momentum transfers. An explanation of this difference is offered based on an analysis of the longitudinal response in nuclear matter. An ansatz is made for the momentum dependence of the nucleon self-energy functions in the nuclear medium which suppresses medium effects for momenta above the nucleon mass scale. This suppression is shown to improve the agreement with the high momentum transfer region between 0.5 and 1.0 GeV.