New determination of 12C(α,γ)16O reaction rate

Abstract

The reaction [Formula: see text]C([Formula: see text])[Formula: see text]O was investigated through the direct [Formula: see text]-transfer reaction (7Li,t) at 28 and 34 MeV incident energies. We determined the reduced [Formula: see text]-widths of the sub-threshold 2[Formula: see text] and 1[Formula: see text] states of [Formula: see text]O from the DWBA analysis of the transfer reaction [Formula: see text]C(7Li,t)[Formula: see text]O performed at two incident energies. The obtained result for the 2[Formula: see text] and 1[Formula: see text] sub-threshold resonances as introduced in the [Formula: see text]-matrix fitting of radiative capture and elastic-scattering data to determine the E2 and E1 [Formula: see text]-factor from 0.01[Formula: see text]MeV to 4.2[Formula: see text]MeV in the center-of-mass energy. After determining the astrophysic factor of [Formula: see text]C([Formula: see text])[Formula: see text]O S(E) with Pierre Descouvement code, I determined numerically the new reaction rate of this reaction at a different stellar temperature (0.06 Gk-2 GK). The [Formula: see text]C([Formula: see text])[Formula: see text]O reaction rate at T[Formula: see text] is [7.21[Formula: see text]] × 10[Formula: see text] cm3 s[Formula: see text] mol[Formula: see text]. Some comparisons and discussions about our new [Formula: see text]C([Formula: see text])[Formula: see text]O reaction rate are presented. The agreements of the reaction rate below T[Formula: see text] between our results and with those proposed by NACRE indicate that our results are reliable, and they could be included in the astrophysical reaction rate network.