Alpha-alpha scattering at 38.5 MeV

Phase analysis of 4He-4He scattering at energies of 40–50 MeV

“…In addition, when the scattering phases were extracted from the optical potentials, only their real parts were calculated, whereas the imaginary parts of the scattering phases were considered small, of the order of 1-2°. This is not justified for energies of 40 MeV and higher.Energies of 38.5 and 49.9 MeV were examined and the measured differential cross sections were presented in [11,12], but the phase analysis of these data was not performed in those works.From the foregoing review it follows that the standard phase analysis of the experimental data, that is, of the differential elastic scattering cross sections for the 4 He-4 He system at energies from 38.5 to 49.9 MeV has not yet been performed. The quality of fitting of the optical potential parameters in this energy interval can be considered only as preliminary, which is not surprising, because all these results were obtained in the early 60s.…”

“…Energies of 38.5 and 49.9 MeV were examined and the measured differential cross sections were presented in [11,12], but the phase analysis of these data was not performed in those works.…”

“…The experimental cross sections of 4 Не-4 Не elastic scattering tabulated for this energy interval in [9,11,12] are quite suitable for these calculations.…”

“…Let us consider now energies of 38.5-50 MeV and perform the phase analysis of experimental data on the differential cross sections presented in [9,11,12].…”

“…Values of the differential cross sections for energy of 38.5 MeV were tabulated in [11], but the phase analysis of these data was not performed. Using the phases presented in [8] for 38.4 MeV as initial ones, we obtained χ 2 = 0.55 for L = 16.…”