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The exotic even-even isotopic chains from Z=32 to Z=38 are investigated bymeans of the relativistic Hartree-Bogoliubov (RHB) approach with the explicitDensity Dependent Meson-Exchange (DD-ME2) and Density Dependent Point-Coupling(DD-PC1) models. The classic magic number N=50 is reproduced and the new numberN=70 is predicted to be a robust shell closure by analysing several calculatedquantities such as: two-neutron separation energies, two-neutron shell gap,neutron pairing energy, potential energy surface and neutron single particleenergies with and without the tensor force. The obtained results arecorroborated by shell model calculations and compared with the predictions offinite range droplet model (FRDM) and with the available experimental data. Areasonable and satisfactory agreement between the theoretical models andexperiment is established.

Shell Evolution in Neutron-rich Ge, Se, Kr and Sr Nuclei within RHB Approach