Shell model calculations for 144Sm and 145Eu Original Research Article

Shell model calculations based on active proton configurations are performed for the nuclei View the MathML sourceSmView the MathML source and View the MathML sourceEuView the MathML source using a Surface Delta plus a modified quadrupole–quadrupole and octupole–octupole interaction. The energies of the excited states up to J=16 and J=29/2, respectively, are obtained in good agreement with the experimental values. Special attention is paid to the description of those excited states which are interpreted in the phonon–phonon or in the particle-core coupling model as View the MathML source, View the MathML source, and View the MathML source configurations, where the 2+ and the 3− state are the low lying collective states of 144Sm.