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The eect of three-body force (TBF) is studied in nucleus-nucleus elastic  scattering on the basis of Brueckner theory for nucleon-nucleon (NN) eective interaction (complex G matrix) in the  nuclear matter. A new G matrix called CEG07 proposed recently  by the present authors includes the TBF eect and reproduces a realistic  saturation curve in the nuclear matter, and is shown to well reproduce  proton-nucleus elastic scattering. The microscopic optical potential for  nucleus-nucleus system is obtained by folding the G matrix with  nucleon density distributions in colliding nuclei. We rst analyze the  16O + 16O elastic scattering at E/A  = 70 MeV in detail. The observed cross sections are nicely reproduced up to the  most backward scattering angles only when the TBF eect is included. The eects  of the three-body attraction (TBA) and three-body repulsion (TBR) are also  analyzed. The TBR contribution has an important role in nucleus-nucleus elastic  scattering. The CEG07 G matrix is also tested in the elastic  scattering of 16O by the 12C, 28Si and  40Ca targets at E/A = 93.9 MeV, and in the  elastic scattering of 12C by the 12C target at  E/A = 135 MeV with a great success. The decisive eect of  the TBF is clearly seen also in those systems

Important role of three-body repulsive force effect in nuclear reactions