Abstract
O20(d,p)O21 transfer reactions are described using momentum-space Faddeev-type equations for transition operators and including the vibrational excitation of the 20O core. The available experimental cross section data at 10.5 MeV/nucleon beam energy for the 21O ground state 52+ and excited state 12+ are quite well reproduced by our calculations including the core excitation. Its effect can be roughly simulated reducing the single-particle cross section by the corresponding spectroscopic factor. Consequently, the extraction of the spectroscopic factors taking the ratio of experimental data and single-particle cross section at this energy is a reasonable procedure. However, at higher energies core-excitation effects are much more complicated and have no simple relation to spectroscopic factors. We found that core-excitation effects are qualitatively very different for reactions with the orbital angular momentum transfer ℓ=0 and ℓ=2, suppressing the cross sections for the former and enhancing for the latter, and changes the shape of the angular distribution in both cases. Furthermore, the core-excitation effect is a result of a complicated interplay between its contributions of the two- and three-body nature.
Highlights
Interactions between nucleons (N ) and composite nuclei (A) are usually modeled by two-body effective optical or binding potentials acting between structureless particles
We analyzed 20O(d, p)21O transfer reactions taking into account the vibrational excitation of the 20O core
Calculations were performed using Faddeev-type equations for transition operators that were solved in the momentumspace partial-wave representation
Summary
1+ 2 are quite well reproduced by our calculations including the core excitation. Its effect can be roughly simulated reducing the single-particle cross section by the corresponding spectroscopic factor. The extraction of the spectroscopic factors taking the ratio of experimental data and single-particle cross section at this energy is a reasonable procedure. At higher energies core-excitation effects are much more complicated and have no simple relation to spectroscopic factors. We found that core-excitation effects are qualitatively very different for reactions with the orbital angular momentum transfer l = 0 and l = 2, suppressing the cross sections for the former and enhancing for the latter, and changes the shape of the angular distribution in both cases. The core-excitation effect is a result of a complicated interplay between its contributions of the two- and three-body nature
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