Phase shift analysis of <SUP>12</SUP>C+<SUP>12</SUP>C elastic scattering in the range Elab=240 to 2400 MeV

초록

A phase shift analysis for the C-12+C-12 system in the range E-lab = 240 to 2400 MeV is performed by using the parametrized phase shift model. The diffractive oscillatory structures observed at forward angles are explained due to the strong interference between the near- and the far-side scattering amplitudes. The negative minima in the deflection curves occurring at angles 0 cl = -49.92 degrees similar to -0.51 degrees corresponding to energies E-lab = 240 similar to 2400 MeV, respectively, are shown to indicate the presences of nuclear rainbows. The partial reaction cross-sections are found to increase linearly up to some peak values and thereafter to decrease quadratically to zero. The peak values of partial reaction cross-section are shown to become smaller as the incident energy increases. Since the strong absorption radius becomes smaller as the incident energy decreases, the nuclear density distributions of the C-12+C-12 system at higher energies are shown to have more overlaps than those at lower energies.

키워드