The ground state properties of 132Sn at equilibrium and at large compression are investi-gated, within the framework of the radially constrained spherical Hartree-Fock(CSHF) approxi-mation. The delta resonance effects on the properties of neutron-rich double magic spherical nucle-us, 13ZSn, in its ground state and the state under static compression are studied. The sensitivity of the nucleon size and △ model spaces is investigated. At equilibrium, mixing between nucleon and △'s in the largest model space of nine major nucleon shells plus 10 △ orbitals was found. Expan-ding the nucleon model space has a larger effect on reducing the static compression modulus and softe-ning the nuclear equation of state than increasing the number of △ states. It was found that the most of the increase in the nuclear energy generated under compression is used to create the massive △ particles. For 13ZSn nucleus under compression at 12 times the normal nuclear density,the excited nucleons to △'s increased sharply up to 13 % of the total number of constituents. This result is consistent with the values extracted from relativistic heavy-ion collisions. The single par-ticle energy levels calculated and their behaviors under compression are examined too. A good agreement between results with effective Hamiltonian and the phenomenological shell model for the low lying single-particle spectra is obtained.
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