  In this work we study the effect of the nuclear tensor force on properties
related with deformation. We focus on isotopes in the Mg, Si, S, Ar, Sr and Zr
chains within the Hartree-Fock-Bogoliubov theory using the D1ST2a Gogny
interaction. Contributions to the tensor energy in terms of saturated and
unsaturated subshells are analyzed. Like-particle and proton-neutron parts of
the tensor term are independently examinated. We found that the tensor term may
considerably modify the potential energy landscapes and change the ground state
shape. We analyze too how the pairing characteristics of the ground state
change when the tensor force is included.
