Mean-field calculation of compressed finite nuclei with Δ excitations

The energies and matter densities of finite nuclei under radial compression are predicted by using a constrained Hartree-Fock method with the Delta degree of freedom included. The results are presented for Zr-90 in a calculation within a model space of seven major oscillator shells. The main feature of this calculation is that the effective baryon-baryon interactions associated with the Delta are evaluated within a G-matrix approach based on a coupled-channel NN+N Delta+pi NN model that can describe the NN data up to 1 GeV. It is found thats the nucleus is compressed to about 2-3 times of the ordinary nuclear density, the Delta component is sharply increased to about 10% of all baryons ill the system. This result is consistent with the values extracted from relativistic heavy-ion collisions.