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

Journal Article · Fri Apr 01 00:00:00 EST 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.71.044609· OSTI ID:20696081

Capel, P ^[1]; Baye, D ^[1]

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1. Physique Quantique, C.P. 165/82 and Physique Nucleaire Theorique et Physique Mathematique, C.P. 229, Universite Libre de Bruxelles, B-1050 Brussels (Belgium)

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 Schroedinger equation. The calculations are performed for the breakup on a lead target of {sup 11}Be and {sup 8}B. The populations of the different partial waves composing the {sup 10}Be-neutron or {sup 7}Be-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{sup +} resonance of {sup 11}Be. Such effects may partly explain discrepancies between direct and indirect measurements of the astrophysical S factor of the {sup 7}Be(p,{gamma}){sup 8}B reaction at stellar energies.

• OSTI ID: 20696081
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 71, Issue 4; Other Information: DOI: 10.1103/PhysRevC.71.044609; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BERYLLIUM 10
BERYLLIUM 11
BERYLLIUM 7 TARGET
BORON 8
CAPTURE
COUPLING
CROSS SECTIONS
ENERGY-LEVEL TRANSITIONS
IMPACT PARAMETER
NEUTRONS
NUCLEAR HALOS
PARITY
PARTIAL WAVES
PERTURBATION THEORY
PROTON REACTIONS
PROTONS
RESONANCE
SCHROEDINGER EQUATION
SPIN
TIME DEPENDENCE