R matrix analysis of interference effects in C-12 (alpha, alpha) C-12 C-12 (alpha, gamma) O-16 - INSPIRE

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R matrix analysis of interference effects in C-12 (alpha, alpha) C-12 C-12 (alpha, gamma) O-16

C. Angulo
(
- Louvain U.
)
,
P. Descouvemont
(
- Brussels U.
)

2000

7 pages

Published in:

Phys.Rev.C 61 (2000) 064611

DOI:

10.1103/PhysRevC.61.064611

View in:

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Abstract: (APS)

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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