The N-N interaction inside nuclei: Evidence for partial chiral restoration?

Using a G-matrix to generate a density-dependent effective NN interaction, we examined the effects of Pauli blocking, nuclear binding, strong relativistic potentials, and modified meson masses on the polarization observables for natural parity states in Si-28 and the 4- and 6-unnatural parity transitions in O-16 and Si-28. Changing meson masses in accordance with the expectation from partial chiral restoration produced no systematic improvement in the ability to describe the data.