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Accelerator mass spectrometry measurements of the $^{13}C(n,γ)^{14}C$ and $^{14}N(n,p)^{14}C$ cross sections

The technique of accelerator mass spectrometry (AMS), offering a complementary tool for sensitive studies of key reactions in nuclear astrophysics, was applied for measurements of the C13(n,γ)C14 and the N14(n,p)C14 cross sections, which act as a neutron poison in s-process nucleosynthesis. Solid sa...

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Autores principales: Wallner, A, Bichler, M, Buczak, K, Dillmann, I, Käppeler, F, Karakas, A, Lederer, C, Lugaro, M, Mair, K, Mengoni, A, Schätzel, G, Steier, P, Trautvetter, H P
Lenguaje:eng
Publicado: 2016
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevC.93.045803
http://cds.cern.ch/record/2262875
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author Wallner, A
Bichler, M
Buczak, K
Dillmann, I
Käppeler, F
Karakas, A
Lederer, C
Lugaro, M
Mair, K
Mengoni, A
Schätzel, G
Steier, P
Trautvetter, H P
author_facet Wallner, A
Bichler, M
Buczak, K
Dillmann, I
Käppeler, F
Karakas, A
Lederer, C
Lugaro, M
Mair, K
Mengoni, A
Schätzel, G
Steier, P
Trautvetter, H P
author_sort Wallner, A
collection CERN
description The technique of accelerator mass spectrometry (AMS), offering a complementary tool for sensitive studies of key reactions in nuclear astrophysics, was applied for measurements of the C13(n,γ)C14 and the N14(n,p)C14 cross sections, which act as a neutron poison in s-process nucleosynthesis. Solid samples were irradiated at Karlsruhe Institute of Technology with neutrons closely resembling a Maxwell-Boltzmann distribution for kT=25 keV, and also at higher energies between En=123 and 182 keV. After neutron irradiation the produced amount of C14 in the samples was measured by AMS at the Vienna Environmental Research Accelerator (VERA) facility. For both reactions the present results provide important improvements compared to previous experimental data, which were strongly discordant in the astrophysically relevant energy range and missing for the comparably strong resonances above 100 keV. For C13(n,γ) we find a four times smaller cross section around kT=25 keV than a previous measurement. For N14(n,p), the present data suggest two times lower cross sections between 100 and 200 keV than had been obtained in previous experiments and data evaluations. The effect of the new stellar cross sections on the s process in low-mass asymptotic giant branch stars was studied for stellar models of 2M⊙ initial mass, and solar and 1/10th solar metallicity.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2016
record_format invenio
spelling oai-inspirehep.net-14479322022-08-10T12:48:56Zdoi:10.1103/PhysRevC.93.045803http://cds.cern.ch/record/2262875engWallner, ABichler, MBuczak, KDillmann, IKäppeler, FKarakas, ALederer, CLugaro, MMair, KMengoni, ASchätzel, GSteier, PTrautvetter, H PAccelerator mass spectrometry measurements of the $^{13}C(n,γ)^{14}C$ and $^{14}N(n,p)^{14}C$ cross sectionsNuclear Physics - ExperimentAstrophysics and AstronomyThe technique of accelerator mass spectrometry (AMS), offering a complementary tool for sensitive studies of key reactions in nuclear astrophysics, was applied for measurements of the C13(n,γ)C14 and the N14(n,p)C14 cross sections, which act as a neutron poison in s-process nucleosynthesis. Solid samples were irradiated at Karlsruhe Institute of Technology with neutrons closely resembling a Maxwell-Boltzmann distribution for kT=25 keV, and also at higher energies between En=123 and 182 keV. After neutron irradiation the produced amount of C14 in the samples was measured by AMS at the Vienna Environmental Research Accelerator (VERA) facility. For both reactions the present results provide important improvements compared to previous experimental data, which were strongly discordant in the astrophysically relevant energy range and missing for the comparably strong resonances above 100 keV. For C13(n,γ) we find a four times smaller cross section around kT=25 keV than a previous measurement. For N14(n,p), the present data suggest two times lower cross sections between 100 and 200 keV than had been obtained in previous experiments and data evaluations. The effect of the new stellar cross sections on the s process in low-mass asymptotic giant branch stars was studied for stellar models of 2M⊙ initial mass, and solar and 1/10th solar metallicity.oai:inspirehep.net:14479322016
spellingShingle Nuclear Physics - Experiment
Astrophysics and Astronomy
Wallner, A
Bichler, M
Buczak, K
Dillmann, I
Käppeler, F
Karakas, A
Lederer, C
Lugaro, M
Mair, K
Mengoni, A
Schätzel, G
Steier, P
Trautvetter, H P
Accelerator mass spectrometry measurements of the $^{13}C(n,γ)^{14}C$ and $^{14}N(n,p)^{14}C$ cross sections
title Accelerator mass spectrometry measurements of the $^{13}C(n,γ)^{14}C$ and $^{14}N(n,p)^{14}C$ cross sections
title_full Accelerator mass spectrometry measurements of the $^{13}C(n,γ)^{14}C$ and $^{14}N(n,p)^{14}C$ cross sections
title_fullStr Accelerator mass spectrometry measurements of the $^{13}C(n,γ)^{14}C$ and $^{14}N(n,p)^{14}C$ cross sections
title_full_unstemmed Accelerator mass spectrometry measurements of the $^{13}C(n,γ)^{14}C$ and $^{14}N(n,p)^{14}C$ cross sections
title_short Accelerator mass spectrometry measurements of the $^{13}C(n,γ)^{14}C$ and $^{14}N(n,p)^{14}C$ cross sections
title_sort accelerator mass spectrometry measurements of the $^{13}c(n,γ)^{14}c$ and $^{14}n(n,p)^{14}c$ cross sections
topic Nuclear Physics - Experiment
Astrophysics and Astronomy
url https://dx.doi.org/10.1103/PhysRevC.93.045803
http://cds.cern.ch/record/2262875
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