Investigating neutron-deficient tin isotopes via realistic shell-model calculations

In a recent paper [1], neutron-deficient even-even tin isotopes up to A = 108 have been investigated by means of a realistic shell-model calculation based on a completely microscopic derivation of the shell-model Hamiltonian and of the proton and neutron electric quadrupole transition effective operators. This calculation leads to a satisfactory description of the observed excitation energies of the yrast 2(+) states and, in particular, of the unexpected large values observed for the B(E2;0(1)(+) -> 2(1)(+)) transition rates. In this contribution, we underline some aspects of the calculation of Ref. [1], aimed essentially to further evidence the merit of the truncation scheme adopted to reduce the computational complexity one faces when using the very large shell-model space needed to describe light tin isotopes. We also report on some preliminary results for Sn-107, which is the lightest odd-Sn isotope investigated via Coulomb excitation.