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Coupling-in-the-continuum effects in Coulomb dissociation of halo nuclei

par Capel, Pierre ;Baye, Daniel Jean
Référence Physical Review C (Nuclear Physics), 71, 4, page (1-7), 044609
Publication Publié, 2005

Article révisé par les pairs

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Résumé :

Higher-order effects in the Coulomb dissociation of halo nuclei are investigated by comparing the first-order perturbation theory to the numerical resolution of a time-dependent Schrödinger equation. The calculations are performed for the breakup on a lead target of 11Be and 8B. The populations of the different partial waves composing the 10Be-neutron or 7Be-proton continuum reveal that couplings in the continuum remain significant even at high impact parameters and high projectile-target relative velocities. Although the total breakup cross section is fairly well described by a first-order approximation, its partial-wave components reached by the first-order transitions are significantly depleted toward other partial waves after the closest approach. The information extracted by assuming the validity of the first-order approximation is affected by an energy distortion. Another distortion is caused by the presence of a resonance as exemplified by the 5/2 + resonance of 11Be. Such effects may partly explain discrepancies between direct and indirect measurements of the astrophysical S factor of the 7Be(p, γ) 8B reaction at stellar energies. ©2005 The American Physical Society.