Physics – Nuclear Physics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvc..45.2870m&link_type=abstract
Physical Review C (Nuclear Physics), Volume 45, Issue 6, June 1992, pp.2870-2878
Physics
Nuclear Physics
19
Projectile And Target Fragmentation, Elementary Particle Processes
Scientific paper
Direct breakup of 7α+t was measured for 54-MeV 7Li+12C, 197Au reactions. The breakup products were detected in coincidence using a close-geometry detection system, and small scattering angles forward of grazing, were investigated. The direct-breakup cross sections for 12C (7Li, αt)12Cg.s. exhibit significant enhancements beyond predictions of simple E1 Coulomb-breakup calculations, indicating the importance of the nuclear field. Direct-breakup yields in 197Au(7Li,αt) quasielastic reactions are sensitive to detector geometry, with the asymptotic fragment energies exhibiting target-proximity effects. Three-body classical trajectory calculations are found to provide qualitative agreement with these observations, provided the projectile is treated as an extended object. These strong Coulomb and nuclear effects severely complicate the extraction of radiative-capture cross sections and low-energy astrophysical S factors.
Gazes S. B.
Mason Elliott J.
Roberts Bonnie R.
Teichmann S. G.
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