Extrapolation of astrophysical S factors for the reaction 14N((p, γ) 15O to near-zero energies

Abstract

The astrophysical S factors for the radiative-capture reaction 14 N(p, γ) 15 O in the region of ultralow energies were calculated on the basis of the R-matrix approach. The values of the radiative and protonic widths were fitted to new experimental data. The contribution of direct radiative capture to bound states of the 15 O nucleus was determined with the aid of asymptotic normalization coefficients, whose values were refined in the present study on the basis of the results obtained from an analysis of the reaction 14 N( 3 He, d) 15 O at three different energies of incident helium ions. A value of S(0) = 1.79 ± 0.31 keV b was obtained for the total astrophysical S factor, and the reaction rate was determined for the process 14 N(p, γ) 15 O.

Measurement of theErc.m.=259 keV resonance in theNDaigle1, Kelly2, Champagne3 et al. 2016Phys. Rev. C235290View full textAdd to dashboardCite

“…[18], the total S-factor as a function of energy as derived from the new R-matrix fits is 8% higher on average than the two measurements of the total S-factor [4,5]. This disagreement becomes worse if the R-matrix fits of Artemov et al [22] are used instead, but it should be noted that they have not renormalized the capture data and also recommend a much larger overall uncertainty (17% vs. 7% in Ref. [18]).…”

“…Efficiency measurements for γ-ray energies below 3 MeV were made by using radioactive sources of 22 28 Si were measured. The data for all sources and reactions emitting more than one γ-ray were corrected for coincidence summing.…”

Determination of the3He+α→7Be asymptotic normalization coefficients, the nuclear vertex constants, and their application for the extrapolation of theTursunmahatov1, Yarmukhamedov2 2012Phys. Rev. CSelf Cite182161View full textAdd to dashboardCite

“…[12]; prompt), respectively, from data set I. In (b) and (e), data denoted by and ( ) are obtained from the analysis of the separated (unseparated) S (exp) 34 (E) of Refs. [13] (activation) and [13] (prompt) (Ref.…”

“…[6][7][8][9][10][11][12][13][14] and references therein), some ambiguities still exist, connected with both the extrapolation of the measured astrophysical S factors for the aforementioned reaction to the solar energy region and the theoretical predictions for σ 34 (E) [or S 34 (E)], and they may influence the predictions of the standard solar model [2,4].…”

“…In Refs. [30,33,34], the MTBPA has been successfully applied to the radiative proton and α-particle capture by some light nuclei. Therefore, it is of great interest to apply the MTBPA for analysis of the 3 He(α,γ ) 7 Be reaction.…”