Measurement of the 70Ge(n,¿) cross section up to 300 keV at the CERN n_TOF facility

Neutron capture data on intermediate mass nuclei are of key importance to nucleosynthesis in the weakcomponent of the slow neutron capture processes, which occurs in massive stars. The (n,¿) cross section on70Ge, which is mainly produced in thesprocess, was measured at the neutron time-of-flight fac...

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Detalles Bibliográficos
Autores: Lederer-Woods, C., Andrzejewski, Józef, Battino, U., Gunsing, Frank, Krticka, M., Massimi, Cristian, Mingrone, Federica, Aberle, O., Audouin, Ludmila, Bacak, M., Barbagallo, Massimo, Beinrucker, C., Berthoumieux, Eric, Bosnar, Damir, Brugger, Matthias, Calviño Tavares, Francisco|||0000-0002-7198-4639, Chen, Yu-Hsiang|||0000-0002-0216-7352, Colonna, Nicola, Cortés Rossell, Guillem Pere|||0000-0002-3648-5826, Cosentino, Luigi, Diakaki, M., Domingo Pardo, César, Dressler, Rugard, Dupont, E., Gonzalez Romero, E., Goverdovski, A., Griesmayer, E., Jericha, E., Kaeppeler, F., Kadi, Y, Ketlerov, V., Kimura, Atsushi, Leal-Cidoncha, E., Leeb, H., Lerendegui-Marco, J., Losito, R., Marganiec, J., Mastromarco, M., Musumarra, A., Patronis, N., Pavlik, A., Rauscher, Thomas, Rubbia, C., Sabaté-Gilarte, M., Saxena, Avadh, Schmidt, Samuel, Stamatopoulos, A., Tassan-Got, L., Vannini, Gianni, Vlachoudis, V., Wallner, A., Wright, T., Žugec, Petar
Tipo de recurso: artículo
Fecha de publicación:2019
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:2117/178088
Acceso en línea:https://hdl.handle.net/2117/178088
https://dx.doi.org/10.1103/PhysRevC.100.045804
Access Level:acceso abierto
Palabra clave:Neutrons
Nuclear physics
Física nuclear
Àrees temàtiques de la UPC::Física
Àrees temàtiques de la UPC::Energies::Energia nuclear
Descripción
Sumario:Neutron capture data on intermediate mass nuclei are of key importance to nucleosynthesis in the weakcomponent of the slow neutron capture processes, which occurs in massive stars. The (n,¿) cross section on70Ge, which is mainly produced in thesprocess, was measured at the neutron time-of-flight facility n_TOF atCERN. Resonance capture kernels were determined up to 40 keV neutron energy and average cross sectionsup to 300 keV. Stellar cross sections were calculated fromkT=5keVtokT=100 keV and are in verygood agreement with a previous measurement by Walter and Beer (1985) and recent evaluations. Average crosssections are in agreement with Walter and Beer (1985) over most of the neutron energy range covered, while theyare systematically smaller for neutron energies above 150 keV. We have calculated isotopic abundances producedins-process environments in a 25 solar mass star for two initial metallicities (below solar and close to solar).While the low metallicity model reproduces best the solar system germanium isotopic abundances, the close tosolar model shows a good global match to solar system abundances in the range of mass numbersA=60–80

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