First Results of the 140Ce(n,g)141Ce Cross-Section Measurement at n_TOF Amaducci, Simone Ogállar Ruiz, Francisco Porras Sánchez, José Ignacio Praena Rodríguez, Antonio Javier Torres Sánchez, Pablo TOF Collaboration Cerium 140Ce Neutron Capture Cross-section S-process n_TOF MACS Nucleosynthesis The cerium oxide material for this measurement was provided by T. Katabuchi of the Tokyo Institute of Technology. An accurate measurement of the 140Ce(n,g) energy-dependent cross-section was performed at the n_TOF facility at CERN. This cross-section is of great importance because it represents a bottleneck for the s-process nucleosynthesis and determines to a large extent the cerium abundance in stars. The measurement was motivated by the significant difference between the cerium abundance measured in globular clusters and the value predicted by theoretical stellar models. This discrepancy can be ascribed to an overestimation of the 140Ce capture cross-section due to a lack of accurate nuclear data. For this measurement, we used a sample of cerium oxide enriched in 140Ce to 99.4%. The experimental apparatus consisted of four deuterated benzene liquid scintillator detectors, which allowed us to overcome the difficulties present in the previous measurements, thanks to their very low neutron sensitivity. The accurate analysis of the p-wave resonances and the calculation of their average parameters are fundamental to improve the evaluation of the 140Ce Maxwellian-averaged cross-section. 2021-07-16T08:51:57Z 2021-07-16T08:51:57Z 2021-06-17 info:eu-repo/semantics/article Amaducci, S... [et al.]. First Results of the 140Ce(n,g)141Ce Cross-Section Measurement at n_TOF. Universe 2021, 7, 200. [https://doi.org/10.3390/universe7060200] http://hdl.handle.net/10481/69744 10.3390/universe7060200 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España MDPI