Multiharmonic nuclear Hamiltonian in the region 120 < A <= 140

The isomorphic shell model is successfully applied for all the 30 stable nu clei with 50 < Z less than or equal to 58 and 70 < N less than or equal to 82 (i.e., with 120 < A less than or equal to 140). The model employs a mult iharmonic Hamiltonian in contrast to single harmonic-oscillator Hamiltonian of the conventional shell model. Derived binding energies and charge radii are in very good agreements with the corresponding experimental values wit hout using adjustable parameters.