Sosnin, N. V.Lederer-Woods, C.Garg, R.Battino, U.Cristallo, S.Dietz, M.Cortés Giraldo, Miguel AntonioGuerrero Sánchez, CarlosLerendegui Marco, JorgeQuesada Molina, José ManuelSabaté Gilarte, MartaŽugec, P.2025-06-242025-06-242024-12-17Sosnin, N.V., Lederer-Woods, C., Garg, R., Battino, U., Cristallo, S., Dietz, M.,...,Žugec, P. (2024). Measurement of the Se 78 (n,γ) Se 79 cross section up to 600 keV at the n_TOF facility at CERN. Physical Review C, 110 (6), 065805. https://doi.org/10.1103/PhysRevC.110.065805.2469-99852469-9993https://hdl.handle.net/11441/174621The 78Se(n, γ ) 79Se cross section has a high impact on the abundances of 78Se produced during the slow neutron capture process (s process) in massive stars. A measurement of the 78Se radiative neutron capture cross section has been performed at the Neutron Time-of-Flight facility at CERN using a set of liquid scintillation detectors that have been optimized for a low sensitivity to neutrons. We present resonance capture kernels up to 70 keV and cross section from 70 to 600 keV. Maxwellian-averaged cross section (MACS) values were calculated for stellar temperatures between kT = 5 and 100 keV, with uncertainties between 4.6% and 5.8%. The new MACS values result in substantial decreases of 20–30% of 78Se abundances produced in the s process in massive stars and AGB stars. Massive stars are now predicted to produce subsolar 78Se / 76Se ratios, which is expected since 76Se is an s-only isotope, while solar 78Se abundances have also contributions from other nucleosynthesis processes.application/pdf12 p.engAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/Measurement of the Se 78 (n,γ) Se 79 cross section up to 600 keV at the n_TOF facility at CERNinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccesshttps://doi.org/10.1103/PhysRevC.110.065805