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Phys. Rev. C 64, 065804 (2001) [7 pages]

Ratio of S factors for (p,γ) reactions on 12C and 13C at astrophysically relevant energies

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C. D. Nesaraja1,2, C. R. Brune2,4, B. T. Crowley1,2, J. H. Kelley2,3, S. O. Nelson1,2, R. M. Prior2,5, K. Sabourov1,2, D. R. Tilley2,3, A. Tonchev1,2, and H. R. Weller1,2
1Duke University, Durham, North Carolina 27708
2Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708
3North Carolina State University, Raleigh, North Carolina 27695
4The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
5North Georgia College and State University, Dahlonega, Georgia 30597

Received 19 July 2001; published 21 November 2001

We present measurements of the 12C(p,γ0)13N/13C(p,γ0)14N S factor ratio at Ep=160 keV. The overall result of 0.33±0.03 is in good agreement with the value of this ratio obtained from previous experimental values of the S factors for the 12C(p,γ0)13N and the 13C(p,γ0)14N reactions. A value for the total S factor ratio of S[12C(p,γtotal)]/S[13C(p,γtotal)]=0.24±0.03 is computed by correcting the 13C(p,γ0) S factor for transitions to the other intermediate states. The direct + resonance model calculation of this ratio and the impact on the CNO cycle are also explored.


©2001 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.64.065804
DOI: 10.1103/PhysRevC.64.065804
PACS: 26.20.+f, 25.40.Lw

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