Important role of three-body repulsive force effect in nuclear reactions
Department of Physics, Osaka City University,
2 RIKEN Nishina Center, RIKEN, Wako, Saitama 351-0198, Japan
3 Physics Section, Tsuru University, Tsuru, Yamanashi 402-8555, Japan
The eﬀect of three-body force (TBF) is studied in nucleus-nucleus elastic scattering on the basis of Brueckner theory for nucleon-nucleon (NN) eﬀective interaction (complex G matrix) in the nuclear matter. A new G matrix called CEG07 proposed recently by the present authors includes the TBF eﬀect 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 ﬁrst 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 eﬀect is included. The eﬀects 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 eﬀect of the TBF is clearly seen also in those systems.
© Owned by the authors, published by EDP Sciences, 2010