  The role of L=0 pairing interactions (both T=0 and T=1) in three selected
bands with the total isospin T=0 in 22Na, 48Cr and 90Rh nuclei is discussed in
the spherical shell model. These bands were selected requiring termination in a
most unfavourable way. The investigated effects coming from pairing
interactions include the change of nuclear wavefunction, quadrupole properties
and state energy. To follow the gradual change of nuclear properties, the
investigation is performed in a perturbative approach by defining the
Hamiltonian with a variable content of the pairing interaction. It is shown
that the pairing does not affect the quadrupole properties, if the energy
distance to other close lying states is large. The calculated pairing energy is
shown to have a similar spin dependence in these three bands. In addition, the
influence of the model space as well as of the residual interaction on the
derived pairing energy is discussed.
