Title:
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Measurement of the resonance capture cross section of 204,206-Pb and termination of the s-process
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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 neutron capture cross sections of 204;206Pb have been measured with high resolution
at the n_TOF facility of CERN (Geneva) [5].
The neutron capture cross section of 204Pb is of particular relevance in astrophysics,
since this s-only isotope constrains the branching of the reaction path at A = 204. The
predicted abundance of this isotope is very sensitive to the details of the stellar model.
Therefore, an accurate value of its capture cross section provides an important test and
constraint for astrophysical models.
206Pb is representative of the entire reaction flow, thus its abundance scales with the
inverse of the cross section, becoming practically independent of the specific stellar
model employed. Consequently, its r-process abundance is well determined as the subtraction
of the s-abundance from the total observed abundance. The r-process abundance
is important as a constraint for the U/Th-cosmochronometer.
Because of the occurrence (26%) of 206Pb in natural lead, its capture cross section
is also important for the design of hybrid reactors based on Pb/Bi eutectic spallation
sources. |
Subject(s):
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-Àrees temàtiques de la UPC::Física -neutron cross seccions -Neutrons--Measurement -Nuclear Astrophysics -Neutrons -- Seccions -Astrofísica nuclear |
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 |
Published by:
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American Institute of Physics (AIP)
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