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New measurement of neutron capture resonances in Bi-209
dc.contributor.author | Calviño Tavares, Francisco |
dc.contributor.author | Cortés Rossell, Guillem Pere |
dc.contributor.author | Poch Parés, Agustí |
dc.contributor.author | Pretel Sánchez, Carme |
dc.contributor.other | Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear |
dc.date.accessioned | 2011-01-24T10:13:10Z |
dc.date.available | 2011-01-24T10:13:10Z |
dc.date.created | 2006-08 |
dc.date.issued | 2006-08 |
dc.identifier.citation | Calviño, F. [et al.]. New measurement of neutron capture resonances in Bi-209. "Physical review C", Agost 2006, vol. 74, núm. 2, p. 02580701-02580710. |
dc.identifier.issn | 0556-2813 |
dc.identifier.uri | http://hdl.handle.net/2117/11161 |
dc.description.abstract | The neutron capture cross section of 209Bi has been measured at the CERN n TOF facility by employing the pulse-height-weighting technique. Improvements over previous measurements are mainly because of an optimized detection system, which led to a practically negligible neutron sensitivity. Additional experimental sources of systematic error, such as the electronic threshold in the detectors, summing of γ -rays, internal electron conversion, and the isomeric state in bismuth, have been taken into account. γ -Ray absorption effects inside the sample have been corrected by employing a nonpolynomial weighting function. Because 209Bi is the last stable isotope in the reaction path of the stellar s-process, theMaxwellian averaged capture cross section is important for the recycling of the reaction flow by α decays. In the relevant stellar range of thermal energies between kT = 5 and 8 keV our new capture rate is about 16% higher than the presently accepted value used for nucleosynthesis calculations. At this low temperature an important part of the heavy Pb-Bi isotopes are supposed to be synthesized by the s-process in the He shells of low mass, thermally pulsing asymptotic giant branch stars.With the improved set of cross sections we obtain an s-process fraction of 19±3% of the solar bismuth abundance, resulting in an r-process residual of 81±3%. The present (n, γ ) cross-section measurement is also of relevance for the design of accelerator driven systems based on a liquid metal Pb/Bi spallation target. |
dc.format.extent | 10 p. |
dc.language.iso | eng |
dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Spain |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
dc.subject | Àrees temàtiques de la UPC::Física |
dc.subject.lcsh | Radiative capture |
dc.subject.lcsh | Stars--Structure. |
dc.title | New measurement of neutron capture resonances in Bi-209 |
dc.type | Article |
dc.subject.lemac | Radiació |
dc.subject.lemac | Estels -- Estructura |
dc.contributor.group | Universitat Politècnica de Catalunya. GREENER - Grup de recerca d'estudis energètics i de les radiacions |
dc.identifier.doi | 10.1103/PhysRevC.74.025807 |
dc.description.peerreviewed | Peer Reviewed |
dc.rights.access | Open Access |
local.identifier.drac | 1227836 |
dc.description.version | Postprint (published version) |
local.citation.author | Calviño, F.; Cortes, G.; Poch, A.; Pretel, M. |
local.citation.publicationName | Physical review C |
local.citation.volume | 74 |
local.citation.number | 2 |
local.citation.startingPage | 02580701 |
local.citation.endingPage | 02580710 |
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