EFFECTS OF THE 3-NUCLEON FORCES FROM DIFFERENT MESON EXCHANGES ON THETRITON BINDING-ENERGY

Effects of the three-nucleon forces on the triton binding energy are i nvestigated using different models for which the pi N scattering ampli tudes for the off-mass-shell pions are extrapolated from the on-mass-s hell data. In the independent model potential, the three-nucleon force s are constructed using the chiral symmetry through partial conservati on of the axial current vectors and current algebra. On the other hand , the three-nucleon forces in the dependent model potential are derive d from an effective Lagrangian which is constrained by chiral and gaug e symmetry. The effect of the long range 2 phi; and the repulsive pi r ho-exchange three-nucleon forces on the triton binding energy are inve stigated. The bound state triton binding energies are then calculated by solving the Faddeev equations with a Hamiltonian including the thre e-nucleon forces, using different nucleon-nucleon interactions. The pi onic form factors are considered with different sets of the form facto r cutoff parameter Lambda. The 2 pi-exchange forces with S-and P-wave amplitudes are found to overbind the triton binding energy by about 0. 4 similar to 1.6 MeV. However, pi rho-exchange forces are found to red uce the 2 pi exchange forces by about 18% of its contribution, to the triton binding energy.