R-matrix analysis of interference effects in 12C(α,α)12C and 12C(α,γ)16O

Details R-matrix analysis of interference effects in 12C(α,α)12C and 12C(α,γ)16O R-matrix analysis of interference effects in 12C(α,α)12C and 12C(α,γ)16O

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phrvc..61f4611a&link_type=abstract

Physical Review C (Nuclear Physics), Volume 61, Issue 6, June 2000, id.064611

Physics

Nuclear Physics

31

Radiative Capture, Direct Reactions, Elastic Scattering, Radiative Capture, Direct Reactions, Elastic Scattering

Scientific paper

The α+12C d phase shift and the 12C(α,γ)16O E2 S factor are analyzed in the R-matrix theory. A new method is proposed to link experimental and calculated parameters within the R-matrix formalism. We show that interference patterns in the phase shift near 3 MeV are very helpful to constrain the parameter set. Starting from this analysis, we fit the 12C(α,γ)16O E2 S factor, and find low-energy values larger than currently accepted. Different interference patterns are found, but do not appear to affect the astrophysical energies. Consequently, direct measurements at low energies are necessary for astrophysical applications.

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