## 抄録

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 ^{12}C(^{13}C,p)^{24}Na 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.

本文言語 | English |
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論文番号 | 135170 |

ジャーナル | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

巻 | 801 |

DOI | |

出版ステータス | Published - 2020 2 10 |

## ASJC Scopus subject areas

- Nuclear and High Energy Physics