Measurement of the 140Ce(n,γ) Cross Section at n_TOF and Its Astrophysical Implications for the Chemical Evolution of the Universe Amaducci, S. Ogállar Ruiz, Francisco Porras Sánchez, José Ignacio Praena Rodríguez, Antonio Javier Torres Sánchez, Pablo TOF Collaboration, / 140Ce(n, γ) is a key reaction for slow neutron-capture (s-process) nucleosynthesis due to being a bottleneck in the reaction flow. For this reason, it was measured with high accuracy (uncertainty ≈5%) at the n_TOF facility, with an unprecedented combination of a high purity sample and low neutron-sensitivity detectors. The measured Maxwellian averaged cross section is up to 40% higher than previously accepted values. Stellar model calculations indicate a reduction around 20% of the s-process contribution to the Galactic cerium abundance and smaller sizeable differences for most of the heavier elements. No variations are found in the nucleosynthesis from massive stars. 2024-06-10T07:40:45Z 2024-06-10T07:40:45Z 2024-03-21 info:eu-repo/semantics/article S. Amaducci et al. (n_TOF Collaboration). Measurement of the 140Ce(n,γ) Cross Section at n_TOF and Its Astrophysical Implications for the Chemical Evolution of the Universe. Phys. Rev. Lett. 132, 122701 (2024) [10.1103/PhysRevLett.132.122701] https://hdl.handle.net/10481/92442 10.1103/PhysRevLett.132.122701 eng info:eu-repo/grantAgreement/EC/NextGenerationEU/2022RJLWHN URKA http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Atribución 4.0 Internacional American Physical Society