Constraining the 12C+12C astrophysical S-factors with the 12C+13C measurements at very low energies

N. T. Zhang, X. Y. Wang, D. Tudor, B. Bucher, I. Burducea, H. Chen, Z. J. Chen, D. Chesneanu, A. I. Chilug, L. R. Gasques, D. G. Ghita, C. Gomoiu, K. Hagino, S. Kubono, Y. J. Li, C. J. Lin, W. P. Lin, R. Margineanu, A. Pantelica, I. C. StefanescuM. Straticiuc, X. D. Tang, L. Trache, A. S. Umar, W. Y. Xin, S. W. Xu, Y. Xu

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


We use an underground counting lab with an extremely low background to perform an activity measurement for the [Formula presented] system with energies down to [Formula presented] MeV, at which the 12C(13C,p)24Na cross section is found to be 0.22(7) nb. The [Formula presented] fusion cross section is derived with a statistical model calibrated using experimental data. Our new result of the [Formula presented] fusion cross section is the first decisive evidence in the carbon isotope systems which rules out the existence of the astrophysical S-factor maximum predicted by the phenomenological hindrance model, while confirming the rising trend of the S-factor towards lower energies predicted by other models, such as CC-M3Y+Rep, DC-TDHF, KNS, SPP and ESW. After normalizing the model predictions with our data, a more reliable upper limit is established for the [Formula presented] fusion cross sections at stellar energies.

Original languageEnglish
Article number135170
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - 2020 Feb 10


  • Astrophysical S-factor
  • Extrapolation models
  • Fusion cross section
  • Hindrance

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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