The alpha widths of the 5603, 5605 and 5668 keV states in 18F

Resonance Strength Measurement at Astrophysical Energies: The17O(p,α)14N Reaction Studied via THM

“…In more detail, the adopted value for the strength of the 183 keV resonance is (ωγ) 2 = (1.67±0.07)×10 −3 eV, obtained by the weighted average of the four strength values reported in literature [3][4][5]13]. Considering the upper and lower limits, the resulting weighted average (ωγ) T HM new = (3.42 ± 0.60) × 10 −9 eV is in good agreement with the strength given by NACRE, (ωγ) N = (5.5 [14] and with the direct value, (ωγ) D =(4.7±0.8)×10 −9 eV calculated by using the same Γ p and Γ α reported in [3,13], namely Γ α =130 eV [15] and Γ p =19± 3 neV [16,17]. The (ωγ) T HM new value is, at the end, in agreement with the value (ωγ) T HM old =(3.66…”

High-intensity-beam study ofO17(p,γ)F18and thermonuclear reaction

“…The measured α-particle and γ-ray partial widths amount to Γ α = 32.0 ± 2.1 eV and Γ γ = 0.891 ± 0.074 eV, respectively [54]. This level is only weakly populated in the…”

“…The measured α-particle and γ-ray partial widths amount to Γ α = 42.8 ± 1.6 eV and Γ γ = 0.485 ± 0.046 eV, respectively [54]. To compute the contributions to the (p,γ) and (p,α) reaction rates by numerically solving Eq.…”

“…This value was obtained in the extensive work of Chafa et al [17] and results in a resonance energy of E cm r = 64.5 ± 0.5 keV, where the quoted uncertainty is dominated by the proton separation energy. Three resonance properties have been measured for this resonance: the (p,α) resonance strength, ωγ pα = (4.7 ± 0.8) × 10 −9 eV [13,55]; the (α,γ) resonance strength, ωγ αγ = 0.44 ± 0.02 eV [44,[57][58][59]; and the α-particle partial width, Γ α = 130 ± 5 eV [54]. Solving for the individual partial widths, we find values of Γ p = (19.0 ± 3.2) × 10 −9 eV, Γ α = 130 ± 5 eV, and Γ γ = 0.44 ± 0.02 eV.…”

Improvement of the high-accuracyO17(p,α)N14reaction-rate measureme

“…III), and of the common uncertainty due to the normalization procedure (4.2% for both LNS and NSL experiments). Considering the upper and lower limits, the resulting weighted average (ωγ) −9 eV calculated by using the same Γ p and Γ α reported in [12,21], namely Γ α =130 eV [23] and Γ p =19± 3 neV [18,20]. The (ωγ)…”