1. Determination of the astrophysical 12N(p,Å)130 reaction rate from the ²H(12N,130)n reaction and its astrophysical implications.
- Author
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Guo, B., Su, J., Li, Z. H., Wang, Y. B., Yan, S. Q., Li, Y. J., Shu, N. C., Han, Y. L., Bai, X. X., Chen, Y. S., Liu, W. P., Yamaguchi, H., Binh, D. N., Hashimoto, T., Hayakawa, S., Kahl, D., Kubono, S., He, J. J., hu, J., and Xu, S. W.
- Subjects
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ASTROPHYSICS , *NITROGEN isotopes , *NUCLEAR reactions , *HYDROGEN isotopes , *SUPERGIANT stars , *STELLAR evolution , *NUCLIDES - Abstract
The evolution of massive stars with very low-metallicities depends critically on the amount of CNO nuclides which they produce. The 12N(p, γ)130 reaction is an important branching point in the rap processes, which are believed to be alternative paths to the slow 3a process for producing CNO seed nuclei and thus could change the fate of massive stars. In the present work, the angular distribution of the 2H(12N, 130)n proton transfer reaction at Ec.m. = 8.4 MeV has been measured for the first time. Based on the Johnson-Soper approach, the square of the asymptotic normalization coefficient (ANC) for the virtual decay of 13Og s. --> 12N 4- p was extracted to be 3.92 ± 1.47 fm-' from the measured angular distribution and utilized to compute the direct component in the 12N(p, γ)130 reaction. The direct astrophysical S factor at zero energy was then found to be 0.39 ±0.15 keV b. By considering the direct capture into the ground state of 130, the resonant capture via the first excited state of 130 and their interference, we determined the total astrophysical S factors and rates of the 12N(p, γ130 reaction. The new rate is two orders of magnitude slower than that from the REACLIB compilation. Our reaction network calculations with the present rate imply that 12N(p, γ)130 will only compete successfully with the ß+ decay of 12N at higher (~2 orders of magnitude) densities than initially predicted. [ABSTRACT FROM AUTHOR]
- Published
- 2013