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

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

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrvc..71d4609c&link_type=abstract

Physical Review C, vol. 71, Issue 4, id. 044609

Statistics

Applications

13

Nuclear Reaction Models And Methods, Breakup And Momentum Distributions, Coulomb Excitation, Semiclassical Theories And Applications

Scientific paper

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.

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