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Nucleosynthesis in the Cd-In-Sn region

Identifieur interne : 01D879 ( Main/Repository ); précédent : 01D878; suivant : 01D880

Nucleosynthesis in the Cd-In-Sn region

Auteurs : RBID : Pascal:94-0481928

Descripteurs français

Pascal (Inist)
- Etude expérimentale, 9530C, 9710C, 2540D, Indium 113, Etain 114, Etain 115, Réaction neutron, Désintégration bêta, Processus s, Processus r, Rapport branchement, Cadmium 113, Nucléosynthèse, Réaction nucléaire, Rendement réaction nucléaire, Cadmium 112, Etat fondamental.

English descriptors

KwdEn :
- Beta decay, Branching ratio, Cadmium 112, Cadmium 113, Experimental study, Ground states, Indium 113, Neutron reactions, Nuclear reaction yield, Nuclear reactions, Nucleosynthesis, R process, S process, Tin 114, Tin 115.

Abstract

The abundance contributions from the possible nucleosynthesis mechanisms to the rare isotopes ¹¹³In, ¹¹⁴Sn, and ¹¹⁵Sn are investigated. The level scheme of ¹¹³Cd was studied via the (n,n′γ) reaction up to 2.5 MeV excitation energy, searching for gateway levels that can provide for thermal equilibration of ground state and isomer under stellar conditions. The experiment confirmed the lowest gateway level at 522 keV, which provides for thermal equilibrium at temperatures above 10⁸ K, resulting in the destruction of the isomer in all plausible s-process scenarios. Accordingly, the importance of the branching at ¹¹³Cd is strongly reduced, allowing only for small s-process yields of ¹¹³In, ¹¹⁴Sn, and ¹¹⁵Sn of <0.3% , <0.5%, and <8%, regardless of the model used. The r-contributions to these isotopes were found to range between 0% and 40%, depending on the post-r-process conditions, and are also not sufficient to account for the observed abundances. For ¹¹⁴Sn the remaining abundance contribution can be accounted for by recent p-process calculations, but a different production mechanism seems to be required for ¹¹³In and ¹¹⁵Sn.

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Pascal:94-0481928

Le document en format XML

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<author><name sortKey="Nemeth, Zs" uniqKey="Nemeth Z">Zs. Németh</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute of Isotopes, H-1525 Budapest, Pf. 77, Hungary</s1>
<sZ>1 aut.</sZ>
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<country xml:lang="fr">Hongrie</country>
<wicri:regionArea>Institute of Isotopes, H-1525 Budapest, Pf. 77</wicri:regionArea>
<wicri:noRegion>Pf. 77</wicri:noRegion>
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</author>
<author><name sortKey="K Ppeler, F" uniqKey="K Ppeler F">F. K Ppeler</name>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Kernforschungszentrum Karlsruhe, Institut für Kernphysik, Postfach 3640 D-76021 Karlsruhe, Germany</s1>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
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<country xml:lang="fr">Allemagne</country>
<wicri:regionArea>Kernforschungszentrum Karlsruhe, Institut für Kernphysik, Postfach 3640 D-76021 Karlsruhe</wicri:regionArea>
<wicri:noRegion>Postfach 3640 D-76021 Karlsruhe</wicri:noRegion>
<wicri:noRegion>Postfach 3640 D-76021 Karlsruhe</wicri:noRegion>
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<author><name sortKey="Theis, C" uniqKey="Theis C">C. Theis</name>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Kernforschungszentrum Karlsruhe, Institut für Kernphysik, Postfach 3640 D-76021 Karlsruhe, Germany</s1>
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<author><name sortKey="Belgya, T" uniqKey="Belgya T">T. Belgya</name>
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<sZ>4 aut.</sZ>
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<country xml:lang="fr">Hongrie</country>
<wicri:regionArea>Institute of Isotopes, H-1525 Budapest, Pf. 77</wicri:regionArea>
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<affiliation wicri:level="2"><inist:fA14 i1="04"><s1>Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506</s1>
<sZ>4 aut.</sZ>
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<country xml:lang="fr">États-Unis</country>
<placeName><region type="state">Kentucky</region>
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<wicri:cityArea>Department of Chemistry, University of Kentucky, Lexington</wicri:cityArea>
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<author><name sortKey="Yates, S W" uniqKey="Yates S">S. W. Yates</name>
<affiliation wicri:level="2"><inist:fA14 i1="05"><s1>Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506</s1>
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<idno type="wicri:Area/Main/Repository">01D879</idno>
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<term>Branching ratio</term>
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<term>Cadmium 113</term>
<term>Experimental study</term>
<term>Ground states</term>
<term>Indium 113</term>
<term>Neutron reactions</term>
<term>Nuclear reaction yield</term>
<term>Nuclear reactions</term>
<term>Nucleosynthesis</term>
<term>R process</term>
<term>S process</term>
<term>Tin 114</term>
<term>Tin 115</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Etude expérimentale</term>
<term>9530C</term>
<term>9710C</term>
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<term>Etain 114</term>
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<term>Réaction neutron</term>
<term>Désintégration bêta</term>
<term>Processus s</term>
<term>Processus r</term>
<term>Rapport branchement</term>
<term>Cadmium 113</term>
<term>Nucléosynthèse</term>
<term>Réaction nucléaire</term>
<term>Rendement réaction nucléaire</term>
<term>Cadmium 112</term>
<term>Etat fondamental</term>
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<front><div type="abstract" xml:lang="en">The abundance contributions from the possible nucleosynthesis mechanisms to the rare isotopes <sup>113</sup>
In, <sup>114</sup>
Sn, and <sup>115</sup>
Sn are investigated. The level scheme of <sup>113</sup>
Cd was studied via the (n,n′γ) reaction up to 2.5 MeV excitation energy, searching for gateway levels that can provide for thermal equilibration of ground state and isomer under stellar conditions. The experiment confirmed the lowest gateway level at 522 keV, which provides for thermal equilibrium at temperatures above 10<sup>8</sup>
 K, resulting in the destruction of the isomer in all plausible s-process scenarios. Accordingly, the importance of the branching at <sup>113</sup>
Cd is strongly reduced, allowing only for small s-process yields of <sup>113</sup>
In, <sup>114</sup>
Sn, and <sup>115</sup>
Sn of <0.3% , <0.5%, and <8%, regardless of the model used. The r-contributions to these isotopes were found to range between 0% and 40%, depending on the post-r-process conditions, and are also not sufficient to account for the observed abundances. For <sup>114</sup>
Sn the remaining abundance contribution can be accounted for by recent p-process calculations, but a different production mechanism seems to be required for <sup>113</sup>
In and <sup>115</sup>
Sn.</div>
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<fC01 i1="01" l="ENG"><s0>The abundance contributions from the possible nucleosynthesis mechanisms to the rare isotopes <sup>113</sup>
In, <sup>114</sup>
Sn, and <sup>115</sup>
Sn are investigated. The level scheme of <sup>113</sup>
Cd was studied via the (n,n′γ) reaction up to 2.5 MeV excitation energy, searching for gateway levels that can provide for thermal equilibration of ground state and isomer under stellar conditions. The experiment confirmed the lowest gateway level at 522 keV, which provides for thermal equilibrium at temperatures above 10<sup>8</sup>
 K, resulting in the destruction of the isomer in all plausible s-process scenarios. Accordingly, the importance of the branching at <sup>113</sup>
Cd is strongly reduced, allowing only for small s-process yields of <sup>113</sup>
In, <sup>114</sup>
Sn, and <sup>115</sup>
Sn of <0.3% , <0.5%, and <8%, regardless of the model used. The r-contributions to these isotopes were found to range between 0% and 40%, depending on the post-r-process conditions, and are also not sufficient to account for the observed abundances. For <sup>114</sup>
Sn the remaining abundance contribution can be accounted for by recent p-process calculations, but a different production mechanism seems to be required for <sup>113</sup>
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Nucleosynthesis in the Cd-In-Sn region

Nucleosynthesis in the Cd-In-Sn region

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri