Effects of meson exchange currents, unbound wave functions, and knockout exchange amplitudes on the extraction of particle-hole strengths for 1h̸ω stretched states

Abstract

It is well known that the strength for excitations of 1h/ω high spin, stretched states observed via inelastic scattering is generally much smaller than that predicted by spherical shell model calculations. In addition, results obtained from electromagnetic and hadronic studies have discrepancies at the 20% level. To gain a better understanding of reduced magnetic strength in electron scattering and hopefully close the gap between experiment and theory, calculations of the electron scattering form factors have been performed including the effects due to meson exchange currents in the transition amplitude and the effects due to unbound wave functions for the valence nucleon. The effect of the meson exchange current contributions is to uniformly enhance the form factors near the first maximum resulting in a 16 to 20% further reduction of the stretched particle‐hole strength. The effect due to the radial wave functions deduced from Woods‐Saxon potentials in which the nucleon is not bound is to reduce the form...