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, ³P_T is in good agreement with the experimental data and ³P_LS is attractive but not strong enough, whereas ³P_C 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.