Title:
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Astrophysical Implications of the139La(n,gamma) and151Sm(n,gamma) Cross Section Measured at n_TOF
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Author:
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Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Poch Parés, Agustí; Pretel Sánchez, Carme
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear; Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions |
Abstract:
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The nuclear resonance parameters and the capture cross section of the neutron magic isotope
139La and of the radioactive isotope 151Sm have been measured relative to 197Au in the energy
range of 0.6 eV-1 MeV at neutron time-of-flight (n_TOF) facility at CERN. The description of
the experimental apparatus is followed by the presentation of the data analysis procedures
consisting in the efficiency correction by means of the Pulse Height Weighting Function
technique, in the determination of different background components and in their subtraction. We
extracted the resonance parameters and the related nuclear quantities such as the resonance
integral, the average gamma width, the nuclear level densities and the neutron strength function.
These results improve the accuracy of the existing data. The deduced values of the Maxwellianaveraged
capture cross section, together with the most recent spectroscopic observations in low
metallicity stars, provide key indications for modelling the nucleosynthesis and the chemical
evolution of heavy nuclei in the Galaxy. |
Subject(s):
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-Àrees temàtiques de la UPC::Física -Neutron cross sections -Radioisotopes -Time-of-flight mass spectrometry -Nucleosynthesis -Neutrons -- Seccions -Nucleosíntesi -Isòtops |
Rights:
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Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Document type:
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Article - Published version Conference Object |
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