Sensitivity of the C13(α,n)O16S factor to the uncertainty in the level parameters of the near-threshold state
| العنوان: | Sensitivity of the C13(α,n)O16S factor to the uncertainty in the level parameters of the near-threshold state |
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| المؤلفون: | M. Febrarro, Michael Wiescher, Joachim Görres, Ian J. Thompson, Carl R. Brune, Richard deBoer |
| المصدر: | Physical Review C. 101 |
| بيانات النشر: | American Physical Society (APS), 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Physics, 010308 nuclear & particles physics, S-factor, Extrapolation, 01 natural sciences, Resonance (particle physics), Amplitude, 0103 physical sciences, Coulomb, Asymptotic giant branch, Sensitivity (control systems), Atomic physics, 010306 general physics, Energy (signal processing) |
| الوصف: | The $^{13}\mathrm{C}(\ensuremath{\alpha},n)^{16}\mathrm{O}$ reaction is the main source of neutrons for the $s$ and $i$ processes in asymptotic giant branch stars and carbon-enhanced metal-poor stars, respectively. The reaction rate over the relevant temperature range from 0.1 to 0.3 GK translates into a center-of-mass energy range of 150 to 540 keV. Current measurements extend down to 300 keV, still requiring an extrapolation of the cross section. At these low energies, the high-energy tail of a $1/{2}^{+}$ state near the reaction threshold makes a significant contribution to the cross section, but its amplitude is still highly uncertain. In this paper the uncertainties associated with the low-energy cross-section extrapolation are investigated, in particular the sensitivity to the energy, width, and Coulomb renormalized asymptotic normalization coefficient of the near-threshold resonance. Recently it has been suggested that the energy of the near-threshold level may have a large impact on the extrapolation, but this is not found to be the case compared with the other sources of uncertainty. |
| تدمد: | 2469-9993 2469-9985 |
| DOI: | 10.1103/physrevc.101.045802 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::82ef2aa098b760692349c1d34bce74fc https://doi.org/10.1103/physrevc.101.045802 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi...........82ef2aa098b760692349c1d34bce74fc |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 24699993 24699985 |
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| DOI: | 10.1103/physrevc.101.045802 |