Helium burning of 18O

Thermonuclear reaction rate ofNe18(α,p)Na21Mohr1, Longland2, Iliadis3 2014Phys. Rev. C2618932View full textAdd to dashboardCite

“…There has been much interest recently in the thermonuclear rate of the 18 Ne(α,p) 21 Na reaction at temperatures of type I X-ray bursts [1,2]. Because of the high temperatures of several Giga-Kelvin (in usual notation: T 9 ≈ 1 − 2), the reaction rate is essentially defined by the cross section at energies between 1 and 3 MeV.…”

“…Matic et al [3] obtained excitation energies, E * , of many levels in the 22 Mg compound nucleus by measuring the 24 Mg(p,t) 22 Mg reaction. These energies define the resonance energies, E, in the 18 Ne(α,p) 21 Na reaction, which enter exponentially into the expression for the reaction rate and are thus the most important ingredient. From the same experiment, total widths Γ of these states were derived [4].…”

“…From the same experiment, total widths Γ of these states were derived [4]. In addition, spins and parities, J π , of several states in 22 Mg have been measured recently by resonant proton scattering using the 21 Na(p,p) 21 Na reaction in inverse kinematics [5,6]. Furthermore, the reverse 21 Na(p,α) 18 Ne reaction has been used in two independent experiments [7,8] to determine a lower limit of the forward 18 Ne(α,p) 21 Na reaction cross section.…”

“…Furthermore, the reverse 21 Na(p,α) 18 Ne reaction has been used in two independent experiments [7,8] to determine a lower limit of the forward 18 Ne(α,p) 21 Na reaction cross section. Mohr and Matic [4] found a dramatic disagreement between the earlier forward 18 Ne(α,p) 21 Na reaction data obtained by Groombridge et al [9] and the reverse reaction data [7,8]. Consequently, the data of Ref.…”

“…[4] to determine the 18 Ne(α,p) 21 Na reaction rate from the available data. In the first approach, the experimental resonance energies from the 24 Mg(p,t) 22 Mg reaction [3], together with α-transfer data for the mirror compound nucleus 22 Ne [3], were employed for calculating * Email: WidmaierMohr@t-online.de the required resonance strengths, ωγ αp .…”