Measurement of the 235U(n,f) cross section relative to the 10B(n,α) reaction with Micromegas detectors at the CERN n_TOF facility: first results Michalopoulou, Veatriki Ogállar Ruiz, Francisco Porras Sánchez, José Ignacio Praena Rodríguez, Antonio Javier Torres Sánchez, Pablo n_TOF Collaboration Funding from the European Union's Horizon 2020 research and innovation programme SANDA (Supplying Accurate Nuclear Data for energy and non-energy Applications) under grant agreement no 847552, is gratefully acknowledged. Neutron cross section measurements are often made relative to a neutron cross section standard. Thus, the accuracy of the neutron standards determines the best possible accuracy of the neutron measurements. The U-235(n,f) cross section is widely used as reference, while it is considered a standard at thermal point and between 0.15 to 200 MeV. For this reason, additional cross section data for the U-235(n,f) reaction are useful in order to improve the accuracy and to extend the energy range of the standard. In this work, preliminary results of the measurement of the 235U(n,f) cross-section relative to the standard (10) B(n,a) reaction are presented. The high accuracy measurement was performed at the experimental area EAR-1 of the n_TOF facility at CERN, aiming at covering the energy range from the thermal region up to approximately 100 keV. The samples were produced at JRC-Geel in Belgium, while the experimental setup was based on Micromegas detectors. 2023-10-17T11:37:21Z 2023-10-17T11:37:21Z 2023-05-26 conference output Michalopoulou, Veatriki et al. Measurement of the 235U(n,f) cross section relative to the 10B(n,α) reaction with Micromegas detectors at the CERN n_TOF facility: first results. EPJ Web of Conferences 284, 01030 (2023) ND2022. [https://doi.org/10.1051/epjconf/202328401030] https://hdl.handle.net/10481/85055 10.1051/epjconf/202328401030 eng info:eu-repo/grantAgreement/EC/H2020/847552 http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional EDP Sciences