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We upgrade a SU_6 quark-model description for the nucleon-nucleon andhyperon-nucleon interactions by improving the effective meson-exchangepotentials acting between quarks. For the scalar- and vector-meson exchanges,the momentum-dependent higher-order term is incorporated to reduce theattractive effect of the central interaction at higher energies. Thesingle-particle potentials of the nucleon and Lambda, predicted by the G-matrixcalculation, now have proper repulsive behavior in the momentum region q_1=5 -20 fm^-1. A moderate contribution of the spin-orbit interaction from thescalar-meson exchange is also included. As to the vector mesons, a dominantcontribution is the quadratic spin-orbit force generated from the rho-mesonexchange. The nucleon-nucleon phase shifts at the non-relativistic energies upto T_lab=350 MeV are greatly improved especially for the 3E states. Thelow-energy observables of the nucleon-nucleon and the hyperon-nucleoninteractions are also reexamined. The isospin symmetry breaking and the Coulombeffect are properly incorporated in the particle basis. The essential featureof the Lambda N - Sigma N coupling is qualitatively similar to that obtainedfrom the previous models. The nuclear saturation properties and thesingle-particle potentials of the nucleon, Lambda and Sigma are reexaminedthrough the G-matrix calculation. The single-particle potential of the Sigmahyperon is weakly repulsive in symmetric nuclear matter. The single-particlespin-orbit strength for the Lambda particle is very small, in comparison withthat of the nucleons, due to the strong antisymmetric spin-orbit forcegenerated from the Fermi-Breit interaction.Comment: Revtex v2.09, 69 pages with 25 figure

Resonating-group study of baryon-baryon interactions for the complete baryon octet:NNinteraction