Charged-particle thermonuclear reaction rates: II. Tables and graphs of reaction rates and probability density functions

Abstract

Numerical values of charged-particle thermonuclear reaction rates for nuclei in the A=14 to 40 region are tabulated. The results are obtained using a method, based on Monte Carlo techniques, that has been described in the preceding paper of this series (Paper I). We present a low rate, median rate and high rate which correspond to the 0.16, 0.50 and 0.84 quantiles, respectively, of the cumulative reaction rate distribution. The meaning of these quantities is in general different from the commonly reported, but statistically meaningless expressions, "lower limit", "nominal value" and "upper limit" of the total reaction rate. In addition, we approximate the Monte Carlo probability density function of the total reaction rate by a lognormal distribution and tabulate the lognormal parameters µ and σ at each temperature. We also provide a quantitative measure (Anderson-Darling test statistic) for the reliability of the lognormal approximation. The user can implement the approximate lognormal reaction rate probability density functions directly in a stellar model code for studies of stellar energy generation and nucleosynthesis. For each reaction, the Monte Carlo reaction rate probability density functions, together with their lognormal approximations, are displayed graphically for selected temperatures in order to provide a visual impression. Our new reaction rates are appropriate for bare nuclei in the laboratory. The nuclear physics input used to derive our reaction rates is presented in the subsequent paper of this series (Paper III). In the fourth paper of this series (Paper IV) we compare our new reaction rates to previous results.

Partial mixing and the formation of 13C pockets in AGB stars: effects on the s-process elements

“…However, even the lowest value we find (−0.90) is still higher than the observations (down to −2 dex). Cavanna et al (2015) reported a revised value of the 22 Ne(p,γ) 23 Na rate measured underground, however, at the temperature of interest (< 20 MK) the new rate is the same as the rate we have used here (Iliadis et al 2010). On the other hand, the rate of the destruction reaction 23 Na(p,α) 20 Ne is poorly known (Iliadis et al 2010).…”

“…Nuclear reaction rates were included using the reaclib file provided by the Joint Institute for Nuclear Astrophysics (JINA, Cyburt et al 2010), as of May 2012 (reaclib V2.0). The rates of the neutron source reactions correspond to Heil et al (2008) for the 13 C(α,n) 16 O and to Iliadis et al (2010) for the 22 Ne(α,n) 25 Mg and 22 Ne(α,γ) 26 Mg reactions. For the neutron-capture cross sections, the JINA reaclib database includes the KADoNiS database (Dillmann et al 2006) 2 .…”

Shell-model studies of therpreaction35Ar(p,γRichter1, Brown2 2012Phys. Rev. C171160View full textAdd to dashboardCite

“…The usdb-cdpn present rate divided by the rate given in the 2010 evaluation (Table B.58 of [8]) is shown in Fig. (5).…”

Absolute determination of theNa22(p,γ)Sallaska1, Wrede2, Garcı́a3 et al. 2011Phys. Rev. C255340View full textAdd to dashboardCite

“…The strengths of the resonances at E p = 45 and 70 keV are too low to be measured directly due to the Coulomb barrier but have been included in the calculation of the reaction rate derived from Ref. [28], based on the ( 3 He,d) spectroscopic factors of Ref [19].…”

“…Thanks to evaporated protective layers [27], the targets exhibited little to no degradation over ∼ 20 C of bombardment. Using mainly the strengths and energies obtained in this work together with supplemental information from other work [24,28], we have re-evaluated the thermonuclear reaction rate of 22 Na(p, γ), and full hydrodynamic simulations have been performed to estimate the effect of the new rate on the flux of 22 Na from novae. This article is a detailed presentation of our experiment, its results, and their implications, complementing our previous reports [29,30].…”