Microscopic study of the 14O(α, p)17F reaction at stellar energies

Explosive Hydrogen Burning

“…The contribution from this state was treated using a narrow-resonance fo rmalism by Wiescher et al (56) and fo und to be insignificant. In contrast, the latter calculation (59) accounts for the measured width of this state explicitly and finds a large effect. In fu rther studies with an enlarged model space (61), this enhancement is reduced by a factor of 3.6, but the high temperature reaction rate is essentially unchanged from that of Funck & Langanke (59).…”

“…At temperatures where the (u,p) reaction predominates, the calculations agree to within a factor of 2. At high temperatures, the rate calculated by Wiescher et al (56) includes a statistical-model estimate of the effects of high-energy resonances, a contribution to the cross section that was not examined by Funck & Langanke (59,61). Because the high-temperature reaction rate from Wiescher et al (56) may be the most reliable, it is used in the network calculations pre sented in Section 5.…”

“…Subsequent to this work, it was pointed out that the direct-reaction mechanism is more complicated than simple direct capture to proton unbound levels (59). Therefore, a microscopic-potential model was em ployed to calculate the (a,p) cross section.…”

Level structure of18Ne and its importance in the14O(α,pTan1, Aprahamian2, Bucher3 et al. 2012Phys. Rev. C172150View full textAdd to dashboardCite

“…Funck and Langanke [22] identified this state as J π = 4 + as member of the α + 14 O molecular band. The analysis of Hahn et al [2] also leads to J π = 4 + as well as that of Harss et al [6] who also gave Γ = 90±40 keV, Γ α = 40±14 eV and Γ p ′ ≤ 1 keV.…”

Examination of the role of theO14(α,p)F17reac

“…Here, the excitation and resonance energies are adopted from the work of Hahn et al [25]. Similar to the method utilized by Hahn et al and Bardayan et al [69], the 14 O(α,p) 17 F total rate has been numerically calculated using the resonance parameters listed in Table II and the direct reaction S factors calculated by Funck and Langanke [70]. Here, the interference between the direct-reaction = 1 partial wave and the 6.15-MeV (1 − ) excited state was included in the calculations; the inelastic branches (in Table II) were also included in the integration.…”