E.C. Simpson C. Ugalde M. Heil P.J. LeBlank R.J. DeBoer H. Costantini E. Uberseder R.E. Azuma C.R. Brune J. Goerres M.M. Wiescher “ In addition, the authors.

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Presentation transcript:

E.C. Simpson C. Ugalde M. Heil P.J. LeBlank R.J. DeBoer H. Costantini E. Uberseder R.E. Azuma C.R. Brune J. Goerres M.M. Wiescher “ In addition, the authors are indebted To Fred C. Barker and (ANU, Canberra) and Erich Vogt (Triumf, Vancouver) for many discussions and their help in the AZURE R-matrix project.”

Differential Cross Section Lane and Thomas, Eqns. 2.7 and 2.8, p. 292 where Angle Integrated Cross section

24°

33°

38.0

43.9°

48.9

54°

58.9°

63.9°

68.9°

74.0°

75.8°

165.8°

Measurement of 16O Widths: Determination of 15N+p astrophysical reactions All reactions and data sets analyzed simultaneously (Including radiative direct capture) Reactions studied: 12C(α,α0)12C 12C(α,α1)12C 12C(α,p)15N 12C(α,γ)16O 15N(p,p0)15N 15N(p,α0)12C 15N(p,α1)12C 15N(p,γ)16O Data Sets: (a,a0) (a,a1) (a,p0) (a,g) Tischausser x Morris et al x Feng et al x Mitchel et al x Mitchel+Ophel x Schuerman et al x (p,p0) (p0,a0) (p,a1) (p,g) Hagedorn x Hagedorn+Marion x Bashkin et al x x Redder et al x Bray et al x LeBlank etal x

Alpha Entrance-Channel Reactions Above proton threshold 12C(α,α0)12C

167° 136° 104° 71°

165°

6.6 MeV6.99 MeV 7.4 MeV7.7 MeV

12c(α,α1)12C Above proton threshold

40° 90° 120°

12C(α,γ)16O and 12C(α,p0)15N Above proton threshold

Total Cross section

30° 40° 90° 120°

Proton Entrance-Channel Reactions Threshold Ex= MeV

25° 105°

0.888 MeV1.038 MeV MeV MeV

82° 159.9°

90° 125° 160°

16 O(  ) 20 Ne

Graphical representation of the related uncertainty between two of the R-matrix fit parameters for the broad resonance at 2.5 MeV. Here the change in chi2 would be on the z- axis. Since the shape is elliptical this signifies that the two parameters have very little correlation. That is, the alpha and gamma widths for this resonance are good (not redundant) fit parameters.

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