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We present realistic models of pion-exchange three-nucleon interactionsobtained by fitting the energies of all the 17 bound or narrow states of 3 <= A<= 8 nucleons, calculated with less than 2% error using the Green's functionMonte Carlo method. The models contain two-pion-exchange terms due to pi-Nscattering in S- and P-waves, three-pion-exchange terms due to ring diagramswith one Delta in the intermediate states, and a phenomenological repulsiveterm. The models have five parameters: the four strengths and the short-rangecutoff. The 17 fitted energies are insufficient to determine all of themuniquely.  We consider five models; they reproduce the observed energies with an rmserror < 1% when used together with the Argonne v18 two-nucleon interaction. Inone of the models the pi-N S-wave scattering interaction is set to zero; in allothers it has the strength suggested by chiral effective field theory. Onemodel also assumes that the pi-N P-wave scattering interaction has the strengthsuggested by effective field theories, and the cutoff is adjusted to fit thedata. In all other models the cutoff is taken to be the same as in the AV18interaction. The effect of relativistic boost correction is estimated. Resultsobtained with only Argonne v8' and v18 interactions are also reported. Inaddition, we present results for 7- and 8-body neutron drops in externalpotential wells.Comment: 36 pages, 3 figures Revised version corrects errors in A=3,4 AV18/UIX  number

Realistic models of pion-exchange three-nucleon interactions