Microscopic IBM-1 description of collective states in 128Ce
1 Ioffe Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia
2 St. Petersburg State University, 198904 St. Petersburg, Russia
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Microscopical quasiparticle theory is developed to calculate the IBM-1 parameters entering the Hamiltonian and E2–operator. The theory takes into account the impact of noncollective phonons and predicts alterations of the superconducting properties along the excitation spectrum, whereas the most collective phonon (the image of the IBM d-boson) is practically invariable. Calculations of the energy spectrum and probabilities of E2–transitions (without effective nucleon charges) were performed for 128Ce. The results obtained are in satisfactory agreement with experimental data.
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