Suppression of the nuclear rainbow in the inelastic nucleus–nucleus scattering

Elastic and Inelastic Alpha Transfer in the \(^{16}\)O+\(^{12}\)C Scattering

“…with the elastic 16 O+ 12 C scattering data where a pronounced rainbow pattern could be revealed at the three considered energies, a similar broad Airy oscillation cannot be seen in the inelastic 16 O+ 12 C scattering data for the 2 + 1 state of 12 C. Such a disappearance of the rainbow pattern in the inelastic 16 O+ 12 C scattering has been explained recently [62] by extending the Fuller's decomposition method (8) for the near-far decomposition of the inelastic scattering amplitude. It was shown that a destructive interference of the coupled partial waves of different multipoles can suppress the oscillating Airy pattern in the inelastic scattering cross section when the nuclear excitation has nonzero spin [62]. Such an effect is analogous to the opacity of an optical prism caused by the refraction of light rays having different wave lengths.…”

Elastic and Inelastic Alpha Transfer in the 16o+12c Scattering

“…It is interesting that a stronger near-side cross section given by the elastic α transfer amplitude at angles π − θ turns out to have a broad Airy-like oscillation from large to medium angles, which is likely associated with the (far-side) refracted α transfer waves evaluated at angles θ . In conclusion, the observed oscillating distortion of the smooth Airy pattern of the nuclear rainbow in the elastic 16 O+ 12 C scattering [6] is due mainly to a stronger interference of the near-side and far-side scattering waves at medium and large angles caused by the (direct and indirect) elastic α transfer.…”

“…Moreover, the leading-order Airy minima (A1 and A2) predicted by the OM analysis [30] at θ c.m. > 100 • are strongly deteriorated due to the contribution of the elastic α transfer in this angular range [6].…”

“…The elastic transfer process was observed for several light heavy-ion (HI) systems at low energies [1], and it had been studied over the years to extract the structure information on the nucleon-and cluster spectroscopic factors (see, e.g., the review [2]) and the asymptotic normalization coefficients [3,4]. Our recent studies have shown clearly the direct link between the elastic transfer process and the parity dependence of the nucleus-nucleus optical potential (OP), a natural consequence of the core-exchange symmetry of the dinuclear system under study [5,6]. These results are an important step toward a deeper understanding of the core-exchange effect in the elastic nucleus-nucleus scattering, which has motivated a renewed interest on this topic [7].…”

Jacques Raynal

“…-Studies of (p,n) reactions [49]; -Theory works for partial waves in nuclear scattering [50]; -Calculated nuclear data generated for reaction evaluation, using OMP and CC equations [16]; -Calculations of Wigner 3 j coefficients [51]; -Non-locality in OMPs for nucleon-nucleus scattering [52]; -CC analysis of the elastic scattering with exotic nuclei within OMP approach [53]; -Applications to proton-nucleus inelastic scattering [54]; -Developments of Raynal's DWBA code [55] and beyond ECIS and DWBA [56]; -Theory for low energy neutron incident reactions [57] and nucleon-induced inelastic scattering [58]; -CC analysis of elastic and inelastic scattering for the studies of giant resonance excitations; calculations of the sub-Coulomb fusion cross sections [15]; -CC effects in nucleus-nucleus inelastic scattering [59] and in heavy ion reactions [60].…”