Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phrvc..75e4618b&link_type=abstract
Physical Review C, vol. 75, Issue 5, id. 054618
Astronomy and Astrophysics
Astrophysics
7
Coupled-Channel And Distorted-Wave Models, Statistical Compound-Nucleus Reactions, Hartree-Fock And Random-Phase Approximations, Hydrostatic Stellar Nucleosynthesis
Scientific paper
The nucleon direct-semidirect (DSD) capture cross sections are obtained by calculating a transition amplitude to the Hartree-Fock-BCS bound states. The radial matrix elements in the DSD amplitudes are calculated from the radial part of the single-particle wave functions. For deformed nuclei the single-particle states are expanded in the cylindrical harmonic-oscillator basis and then projected on the spherical harmonic-oscillator basis. The pairing correlations are treated in the BCS approach and the calculated spectroscopic factors are in fairly good agreement with experimental data in the even tin isotopes from Sn116 to Sn124. The resulting DSD cross sections for the neutron capture by Pb208 and U238 are found to be in good agreement with the available experimental data. The calculations are also performed for the neutron capture on Sn122 and Sn132 isotopes that are important for the r-process in astrophysics.
Bonneau Ludovic
Chiba Satoshi
Kawano Teruhiko
Watanabe Ta.
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