Collective bands in doubly-even Sn nuclei: Energy spectra and electromagnetic decay properties

Starting from a simplified description, treating proton two-particle two-hole (2p-2h) excitations coupled with spherical quadrupole vibrations in interaction with the low-lying quadrupole vibrational states in doubly-even ${}_{}{}^{112-118}{}_{}{}^{}\mathrm{Sn}$ nuclei, we are able to account for the regular $\Delta J=2\mathrm{}$ band structure on top of excited $J^{\pi }=0^{+}$ states. Energy spectra as well as $E2\mathrm{}$ and $E0\mathrm{}$ decay properties are calculated and are extensively compared with recent experimental data.