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Elastic and inelastic scattering of -particles at 48.1MeV and 3He at 60MeV on O nuclei has been measured with excitation of states at 6.05 (0)-6.13 (3)MeV, 6.92 (2)-7.12 (1)MeV and 8.87 (2)MeV. The center-of-mass beam momenta are the same for these two strongly absorbed particles. Analysis of angular distributions was performed in the frameworks of the optical model, the coupled channels method and the Distorted Wave Born Approximation (DWBA). A good description of experimental data was obtained over the full angular range without taking into account the spin-orbit interaction and the cluster transfer mechanism with real potentials that have volume integrals of about 400MeV fm3. Collective and microscopic models were used in the analysis of the inelastic scattering. The values of the octupole deformation lengths were extracted. It is shown that nuclear rainbow effects appear not only in the elastic, but also in the inelastic scattering with excitation of the 3 state of O. [ABSTRACT FROM AUTHOR]

Complete angular distributions of the 12C + 18O elastic and inelastic scattering were measured at the energy Elab(18O) = 105 MeV ( Ec.m. = 42 MeV) . Comparison of these elastic-scattering data with those from previously measured 12C + 16O data show their large-angle cross-sections to differ by as much as a factor of 100 with the 16O data being the largest. These and the 12C + 18O scattering data taken from the literature at the energies Ec.m. = 12.9-56 MeV were analysed within the optical model and coupled-reaction-channels methods. Sets of Woods-Saxon 12C + 18O optical potential parameters were obtained and their energy dependence was deduced. A similar analysis was carried out for 12C + 16O where it was shown that over a wide energy range, the primary difference in the 16O and 18O scattering potentials is in their imaginary parts. The large-angle enhancement for the 12C + 18O elastic-scattering was shown to arise from the transfer of nucleons. The inelastic-scattering data were well described over the entire angular range as arising from collective excitations of the states in the target and projectile nuclei. [ABSTRACT FROM AUTHOR]

A unified description of existing experimental data on alpha-particle scattering by 6Li over the broad energy range from 18 to 166 MeV was obtained with allowance for channel-coupling effects and mechanisms involving the exchange of a deuteron cluster. Angular distributions were analyzed on the basis of the optical model and the coupled reaction channels method. It was shown that the inclusion of channel coupling and the contributions from one- and two-step exchangemechanismsmakes it possible to describe special features of the behavior of differential cross sections for both elastic and inelastic scattering in a full energy range. Optimum values found for the parameters of optical potentials agree with the parameters of the global potential proposed previously for nuclei in the mass region A > 12. [ABSTRACT FROM AUTHOR]

The ([sup 6]Li, [sup 7]Be) and ([sup 6]Li, [sup 7]Li) reactions on [sup 6]Li and [sup 7]Li nuclei were investigated in the angular interval 0°–20° in the laboratory system at a [sup 6]Li energy of 93 MeV. In addition to low-lying states of the [sup 5,6]He and [sup 5,6]Li nuclei, broad structures were observed near the t([sup 3]He) + d and t([sup 3]He) + t thresholds at the excitation energies of 16.75 (3/2[sup +]) and ∼20 MeV (for [sup 5]He), 16.66 (3/2[sup +]) and ∼20 MeV ([sup 5]Li), 14.0 and 25 MeV ([sup 6]He), and ∼20 MeV ([sup 6]Li). The angular distributions measured in the [sup 7]Li([sup 6]Li, [sup 7]Be)[sup 6]He reaction for transitions to the ground state (0[sup +]) and excited states at E[sub x] = 1.8 MeV (2[sup +]) and 14.0 MeV of the [sup 6]He nucleus were analyzed by the finite-range distorted-wave method assuming the 1p- and 1s-proton pickup mechanism. The ([sup 6]Li, [sup 7]Be) and ([sup 6]Li, [sup 7]Li) reactions were shown to proceed predominantly through the one-step pickup mechanism, and the broad structures observed at high excitation energies are considered as quasimolecular states of the t([sup 3]He) + d and t([sup 3]He) + t types.© 2002 MAIK “Nauka / Interperiodica”. [ABSTRACT FROM AUTHOR]