Astrophysical S17(0) factor extraction from breakup of B8 on Ni58 at energies near the Coulomb barrier

Details Astrophysical S17(0) factor extraction from breakup of B8 on Ni58 at energies near the Coulomb barrier Astrophysical S17(0) factor extraction from breakup of B8 on Ni58 at energies near the Coulomb barrier

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phrvc..80f4617b&link_type=abstract

Physical Review C, vol. 80, Issue 6, id. 064617

Astronomy and Astrophysics

Astrophysics

3

Breakup And Momentum Distributions, Interaction And Reaction Cross Sections, Spectroscopic Factors And Asymptotic Normalization Coefficients, Elastic Scattering

Scientific paper

We have performed continuum-discretized coupled channels (CDCC) calculations of the breakup of B8 on Ni58 and direct proton transfer for the B8+Ni58 system at laboratory energies of 20-28.4 MeV. The influence of the Be7 core-target optical potential (OP) on the breakup cross section was investigated. Elastic scattering angular distributions for the Be7+Ni58 and B8+Ni58 systems at five different energies around the Coulomb barrier were studied, and a reasonable energy-independent OP for each system was obtained. Using these OPs and two different Be7-p relative motion wave functions, and summing breakup and direct proton transfer contributions, we were able to fit the experimental cross section at a B8 laboratory energy of 25.75 MeV. We calculated the excitation function for the Be7 emission in the B8+Ni58 reaction, where Be7 products were measured at the forward angle θlab=45° in the energy interval Elab=20-28.4 MeV. In view of the peripheral character of the B8 breakup reaction at near-barrier energies, we could extract the asymptotic normalization coefficient for the Be7-p system, which was found to be CBe-p,p3/22=0.543±0.027 fm-1. Finally, the astrophysical S17(0) factor was found to be S17(0)=20.8±1.1 eV b.

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