The 12C(a,g)16O Cross Section at Low Energies

Barker, F.C.; Kajino, T.

doi:10.1071/ph910369

Cited by 140 publications

(141 citation statements)

References 7 publications

(43 reference statements)

Supporting

Mentioning

137

Contrasting

Order By: Relevance

“…Ref. [41,44,45]) is used for non-resonant γ-ray cross section contributions. Fits are performed using the alternative R-matrix parameterization described in Ref.…”

Section: R-matrix Approachmentioning

confidence: 99%

R-matrix analysis of16O compound nucleus reactions

et al. 2013

View full text Add to dashboard Cite

Background Over the last 60 years, a large amount of experimental nuclear data has been obtained for reactions which probe the 16 O compound nucleus near the alpha and proton separation energies, the energy regimes most important for nuclear astrophysics. Difficulties and inconsistencies in R-matrix fits of the individual reactions prompt a more complete analysis.Purpose Determine the level of consistency between the wide variety of experimental data using a multiple entrance/exit channel R-matrix framework. Using a consistent set of data from multiple reaction channels, attain an improved fitting for the 15 N(p, γ0) 16 O reaction data.Methods Reaction data for all available reaction channels were fit simultaneous using a multichannel R-matrix code.Results Over the wide range of experimental data considered, a high level of consistency was found, resulting in a single consistent R-matrix fit which described the broad level structure of 16 O below Ex = 13.5 MeV. The resulting fit was used to extract an improved determination of the low energy S-factor for the reactions 15 N(p, γ) 16 O and 15 N(p, α) 12 C. ConclusionThe feasibility and advantages of a complete multiple entrance/exit channel R-matrix description for the broad level structure of 16 O has been achieved. A future publication will investigate the possible effects of the multiple channel analysis on the reaction 12 C(α, γ) 16 O.

show abstract

“…Ref. [41,44,45]) is used for non-resonant γ-ray cross section contributions. Fits are performed using the alternative R-matrix parameterization described in Ref.…”

Section: R-matrix Approachmentioning

confidence: 99%

R-matrix analysis of16O compound nucleus reactions

et al. 2013

View full text Add to dashboard Cite

show abstract

“…(2) has significant uncertainties, as can be seen from In this work, we will use R-matrix method to avoid the above problems. For the radiative capture reaction B + b → A + γ, the R-matrix radiative capture cross section to a state of nucleus A with a given spin J f may be written as [26] …”

Section: Measurement Of Thementioning

confidence: 99%

N13(d,n)
Li
¹
,
Yan
²
,
Liu
³

et al. 2006
Phys. Rev. C

View full text Add to dashboard Cite

Abstract13 N(p, γ) 14 O is one of the key reactions in the hot CNO cycle which occurs at stellar temperatures around T 9 ≥ 0.1. Up to now, some uncertainties still exist for the direct capture component in this reaction, thus an independent measurement is of importance. In present work, the angular distribution of the 13 N(d, n) 14 O reaction at E c.m. = 8.9 MeV has been measured in inverse kinematics, for the first time. Based on the distorted wave Born approximation (DWBA) analysis, the nuclear asymptotic normalization coefficient (ANC), C 14 O 1,1/2 , for the ground state of 14 O → 13 N + p is derived to be 5.42 ± 0.48 fm −1/2 . The 13 N(p, γ) 14 O reaction is analyzed with the R-matrix approach, its astrophysical S-factors and reaction rates at energies of astrophysical relevance are then determined with the ANC. The implications of the present reaction rates on the evolution of novae are then discussed with the reaction network calculations.

show abstract

“…(9-11) into Eqs. (12,13). (2) If B c = S c (E λ ), the matrix E is diagonal for the energy E λ and hence E λ is an eigenvalue.…”

Section: A Definition Of the Parameterizationmentioning

confidence: 99%

Alternative parametrization ofR-matrix theory

Brune¹

2002

Phys. Rev. C

149

190

View full text Add to dashboard Cite

An alternative parameterization of R-matrix theory is presented which is mathematically equivalent to the standard approach, but possesses features which simplify the fitting of experimental data. In particular there are no level shifts and no boundary-condition constants which allows the positions and partial widths of an arbitrary number of levels to be easily fixed in an analysis. These alternative parameters can be converted to standard R-matrix parameters by a straightforward matrix diagonalization procedure. In addition it is possible to express the collision matrix directly in terms of the alternative parameters.

show abstract

The 12C(a,g)16O Cross Section at Low Energies

Cited by 140 publications

References 7 publications

R-matrix analysis of16O compound nucleus reactions

R-matrix analysis of16O compound nucleus reactions

N13(d,n)
Li
¹
,
Yan
²
,
Liu
³

et al. 2006
Phys. Rev. C

Alternative parametrization ofR-matrix theory

Contact Info

Product

Resources

About

The 12C(a,g)16O Cross Section at Low Energies

Cited by 140 publications

References 7 publications

R-matrix analysis of16O compound nucleus reactions

R-matrix analysis of16O compound nucleus reactions

N13(d,n)Li1, Yan2, Liu3 et al. 2006Phys. Rev. C

Alternative parametrization ofR-matrix theory

Contact Info

Product

Resources

About

N13(d,n)
Li
¹
,
Yan
²
,
Liu
³

et al. 2006
Phys. Rev. C