Author/Authors :
I. Bobeldijk، نويسنده , , H.P. Blok، نويسنده , , H.B. van den Brink، نويسنده , , G.E. Dodge، نويسنده , , W.H.A. Hesselink، نويسنده , , E. Jans، نويسنده , , W-J. Kasdorp، نويسنده , , L. Lapikas، نويسنده , , J.J. van Leeuwe، نويسنده , , C. Marchand، نويسنده , , G. Onderwater، نويسنده , , A. Pellegrino، نويسنده , , M. van Sambeek، نويسنده , , C.M. Spaltro، نويسنده , , G. van der Steenhoven، نويسنده , , J.J.M. Steijger، نويسنده , , J.A. Templon، نويسنده , , M.A. van Uden، نويسنده , , R. de Vries، نويسنده , , P.K.A. de Witt Huberts، نويسنده , , et al.، نويسنده ,
Abstract :
Cross sections for the reaction 208Pb(e,e′p) have been measured with the continuous electron beam from the Amsterdam Pulse-Stretcher facility at NIKHEF-K. The spectral function has been extracted for protons with initial momenta of 300 to 500 MeV/c and binding energies up to 26 MeV. The data are compared to calculations with and without inclusion of nucleon-nucleon correlations. Mean-field predictions significantly underestimate the data and the discrepancy increases with binding energy. For transitions to the valence states the discrepancy is removed by introducing long-range correlations. Above the two-nucleon emission threshold long-range and short-range correlations reduce the discrepancy, but are insufficient to fully account for the measured strength.
