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As a first step to derive the IBM from a microscopic nuclear hamiltonian, webosonize the pairing hamiltonian in the framework of the path integralformalism respecting both the particle number conservation and the Pauliprinciple. Special attention is payed to the role of the Goldstone bosons. Weconstruct the saddle point expansion which reproduces the sector of thespectrum associated to the addition or removal of nucleon pairs.Comment: 23 page

Goldstone bosons in the pairing Hamiltonian: The path integral approach