Measurement of the Se 78 (n,y) Se 79 cross section up to 600 keV at the n_TOF facility at CERN

The 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 o...

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Detalles Bibliográficos
Autores: Sosnin, Nikolay Viktorovich, Lederer Woods, Claudia, Garg, R., Battino, Umberto, Cristallo, Sergio, Dietz, Mirco, Heinitz, S., Krticka, Milan, Reifarth, R., Valenta, S., Vescovi, Diego, Aberle, Oliver, Alcayne Aicua, Víctor, Amaducci, Simone, Andrzejewski, Józef, Bécares, Vicente, Babiano Suárez, Víctor, Bacak, Michael, Calviño Tavares, Francisco|||0000-0002-7198-4639, Casanovas Hoste, Adrià|||0000-0002-7138-0894, Cortés Rossell, Guillem Pere|||0000-0002-3648-5826, Tarifeño Saldivia, Ariel Esteban|||0000-0001-8552-5030
Tipo de recurso: artículo
Fecha de publicación:2024
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/423110
Acceso en línea:https://hdl.handle.net/2117/423110
https://dx.doi.org/10.1103/PhysRevC.110.065805
Access Level:acceso abierto
Palabra clave:Direct reactions
Level densities
Neutron physics
Nuclear astrophysics
Nuclear reaction rates
Nuclear reactions
Nuclear spin & parity
Radiative capture
S process
59 = A = 89
Àrees temàtiques de la UPC::Física
Descripción
Sumario:The 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.

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