Influence of spin-orbit force on nucleon-nucleon scattering in the quark delocalization colour screening model

The symmetric spin-orbit interactions of one-gluon-exchange and confinement are included in the nucleon-nucleon phase shift calculation in the framework of quark delocalization colour screening model. The spin-orbit interaction has little influence on D wave phase shift. For the triplet P waves, 3 PT is in good agreement with the experimental data and P-3(LS) is attractive but not strong enough, whereas 3 PC is too strongly repulsive. Our results indicate that the symmetric spin-orbit interaction of one-gluon-exchange and confinement potential cannot give a good description of the triplet P wave phase shifts. More sophisticated considerations, the delocalization depending on the relative orientation between two cluster, might be needed to improve the description of P-wave NN interaction.