Effects of repulsive three-body force in 12C + 12C scattering at 100A MeV

W.W Qu,G.L Zhang,S Terashima,T Furumoto,Y Ayyad,Z.Q Chen,C.L Guo,A Inoue,X.Y Le,H.J Ong,D.Y Pang,H Sakaguchi,Y Sakuragi,B.H Sun,A Tamii,I Tanihata,T.F Wang,R Wada,Y Yamamoto

doi:10.1016/j.physletb.2015.10.008

Abstract

The angular distribution of 12C + 12C scattering at an incident energy of 100A MeV has been measured. The elastic and inelastic scatterings in 12C to the excitation energies of up to ∼45 MeV were measured simultaneously for the first time with the high-resolution Grand Raiden spectrometer at the Research Center for Nuclear Physics (RCNP). The angular distributions of the elastic scattering to the ground state (01+) and inelastic scattering to the 4.44 MeV (21+) excited state were precisely obtained in the angular range of 1.0°–7.5° with a step of 0.1°. Additionally, the angular distribution was obtained for the sum of the cross sections for excitation energies above the 4.44 MeV state up to 11 MeV, which includes the 7.65 MeV (02+), 9.64 MeV (31−), and 10.30 MeV (22+) states, in addition to probably the simultaneous excitation of the 4.44 MeV state in the projectile and the target nuclei. Those combined data provide a means to study the effects of channel coupling on the elastic cross section. The observed angular distributions are compared with theoretical calculations based on three double-folding models with complex G-matrix interactions, the CEG07b, MPa, and ESC models. The importance of three-body repulsive forces included in the CEG07b and MPa models will be discussed.

Highlights

The angular distribution of 12C + 12C scattering at an incident energy of 100A MeV has been measured
MeV (2+1 ) excited state were precisely obtained in the angular distribution was obtained the for the sum of the cross sections for excitation energies above the 4.44 MeV state up to 11 MeV, which includes the 7.65 MeV (0+2 ), 9.64 MeV (3−1 ), and 10.30 MeV (2+2 ) states, in addition to probably the simultaneous excitation of the 4.44 MeV state in the projectile and the target nuclei
The observed angular distributions are compared with theoretical calculations based on three double-folding models with complex G-matrix interactions, the CEG07b, MPa, and ESC models

Summary

Introduction

The angular distribution of 12C + 12C scattering at an incident energy of 100A MeV has been measured. The angular distributions of differential cross sections of elastic and inelastic scatterings of 12C + 12C at an incident energy of 100A MeV were measured. This magnetic spectrometer has excellent ion-optical properties [24], and we were able to separately measure the angular distribution of the inelastic scattering to the 4.44 MeV excited state with a high-energy beam.

Results

Conclusion