Coulomb-modified eikonal model analysis of refractive 12C + 12C elastic scattering at Elab = 240 and 360 MeV

초록

We present the Coulomb-modified eikonal model by using a tangential velocity at the distance of closest approach. The Fraunhöfer oscillations observed in the elastic angular distributions of the 12C + 12C system at E<inf>lab</inf> = 240 and 360 MeV can be explained due to the strong interference between the near- and far-side scattering amplitudes. We have found that the strongly real and weakly imaginary potentials are required to describe the refractive 12C + 12C elastic scatterings at E<inf>lab</inf> = 240 and 360 MeV. The refractive pattern, dominated by the far-side component of the scattering amplitude, can be shown to be sensitive to the real part of optical potential at small radius. Introducing the tangential velocity, it is shown that the Coulomb-modified eikonal model satisfactorily reproduces experimental data concerning the refractive pattern in the angular distributions of the 12C + 12C system at E<inf>lab</inf> = 240 and 360 MeV.

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