Analyzing power and cross section distributions of the knockout reaction208Pb(p→,2

Scalar and vector form factors of the in-medium nucleon

“…We stress that this correction is caused by the change of the internal quark wave function at the mean-field level and hence there is no obvious double counting with MEC etc. This is a new effect which should be taken into account additionally to the standard nuclear corrections.Furthermore, the measurements of polarization transfer observables in exclusive ( p, 2 p) proton knockout reactions from various nuclei [9,10] again indicate that it is difficult to account for the measured polarization transfers within the conventional, relativistic distorted wave impulse approximation [11]. To reproduce the measured spin observables, it is necessary to simultaneously reduce the scalar (σ) and vector (ω) coupling constants and the meson masses by about 10 ∼ 20% [11].…”

“…The change of these form factors is very significant in understanding how the strong interaction is modified in nuclear matter. It is also expected to play an important role in analyzing the polarization transfer observables in the exclusive ( p, 2 p) reactions [9,10].…”

“…Such parameterizations are very useful in analyzing the experimental results, e.g., for the exclusive ( p, 2 p) proton knockout reactions [9,10]. With an error less than 0.2%, the ratios can be represented by…”

Nucleon-Nucleon t-matrix Effective Interaction for (p, 2p)Reactions

“…Thus far, the use of the Dirac phenomenology in the present relativistic finite range-distorted wave impulse approximation (RFR-DWIA) has not resulted much improvement in agreements with the data in comparison to the non-relativistic FR-DWIA formalisms. The existing studies of the sensitivities of the analyzing power to both the zero range (ZR) and finite range (FR) approximations on 40 Ca and 208 Pb targets have not resulted in any definite conclusion as to which approximation gives a consistently better description of the data [3,6]. The RFR-DWIA calculations using all the inputs mentioned above sometimes describe the shape of the energy sharing spectra reasonably well but often the analyzing power data fits show significant disagreement.…”

“…These expectations grew further with the recent advancements made in this field due to the incorporation of the sophisticated relativistic finite range methodology and the development of related computer programs [1,2,3,4,5,6]. For performing these advanced calculations one requires not only the scalar and vector components of the optical potentials which in the Dirac phenomenology fit the proton elastic scattering data but also requires the proper p-p t -matrix effective interaction, t( r).…”