The 12C(a,g)16O Cross Section at Low Energies
F. C. BarkerDepartment of Theoretical Physics, Research School of Physical Sciences, Australian National University, G.P.O. Box 4, Canberra, A.C.T. 2601, AustraliaT. KajinoDepartment of Physics, Tokyo Metropolitan University, Setagaya-ku, Tokyo 158, Japan
1991en
ABI
Annotatsiya
An R-matrix formula for the cross section for radiative capture reactions is developed and applied to fit recently measured 12C(oc,y)160 data, for both ground-state transitions and cascade transitions through the 6·92 and 7 ·12 MeV levels. The correct treatment of the channel contributions is significant for the E2 cascade transitions. Consistent fits of the cascade and ground-state data suggest a value of the channel radius larger than those previously used, and consequently a value of the low-energy astrophysical S-factor appreciably larger than that adopted recently.
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