Shedding Light on the Origin of ^{204}Pb, the Heaviest s-Process-Only Isotope in the Solar System
Asymptotic giant branch stars are responsible for the production of most of the heavy isotopes beyond Sr observed in the solar system. Among them, isotopes shielded from the -process contribution by their stable isobars are defined as -only nuclei. For a long time the abundance of 204Pb, the heavies...
| Autores: | , , , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Universidad de Sevilla (US) |
| Repositorio: | idUS. Depósito de Investigación de la Universidad de Sevilla |
| OAI Identifier: | oai:idus.us.es:11441/168930 |
| Acceso en línea: | https://hdl.handle.net/11441/168930 https://doi.org/10.1103/PhysRevLett.133.052702 |
| Access Level: | acceso abierto |
| Palabra clave: | Nuclear astrophysics Nuclear reaction rates Nuclear reactions Radiative capture s process 190 ≤ A ≤ 219 Nuclear data analysis & compilation Radiation detectors Nuclear reaction rates Nuclear reactions Radiative capture s process 190 ≤ A ≤ 219 Nuclear data analysis & Nuclear reaction rates Nuclear reactions Radiative capture s process 190 ≤ A ≤ 219 Nuclear data analysis |
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Shedding Light on the Origin of ^{204}Pb, the Heaviest s-Process-Only Isotope in the Solar SystemCasanovas-Hoste, A.Domingo-Pardo, C.Lerendegui Marco, JorgeGuerrero Sánchez, CarlosTarifeño-Saldivia, A.Krtička, M.Pignatari, M.Cortés Giraldo, Miguel AntonioQuesada Molina, José ManuelRajeev, K.Nuclear astrophysics Nuclear reaction rates Nuclear reactions Radiative capture s process 190 ≤ A ≤ 219 Nuclear data analysis & compilation Radiation detectorsNuclear reaction rates Nuclear reactions Radiative capture s process 190 ≤ A ≤ 219 Nuclear data analysis &Nuclear reaction rates Nuclear reactions Radiative capture s process 190 ≤ A ≤ 219 Nuclear data analysisAsymptotic giant branch stars are responsible for the production of most of the heavy isotopes beyond Sr observed in the solar system. Among them, isotopes shielded from the -process contribution by their stable isobars are defined as -only nuclei. For a long time the abundance of 204Pb, the heaviest -only isotope, has been a topic of debate because state-of-the-art stellar models appeared to systematically underestimate its solar abundance. Besides the impact of uncertainties from stellar models and galactic chemical evolution simulations, this discrepancy was further obscured by rather divergent theoretical estimates for the neutron capture cross section of its radioactive precursor in the neutron-capture flow, 204Tl (1/2=3.78 yr), and by the lack of experimental data on this reaction. We present the first ever neutron capture measurement on 204Tl, conducted at the CERN neutron time-of-flight facility n_TOF, employing a sample of only 9 mg of 204Tl produced at the Institute Laue Langevin high flux reactor. By complementing our new results with semiempirical calculations we obtained, at the -process temperatures of ≈8 keV and ≈30 keV, Maxwellian-averaged cross sections (MACS) of 580(168) mb and 260(90) mb, respectively. These figures are about 3% lower and 20% higher than the corresponding values widely used in astrophysical calculations, which were based only on theoretical calculations. By using the new 204Tl MACS, the uncertainty arising from the 204Tl(n,) cross section on the -process abundance of 204Pb has been reduced from ∼30% down to +8%/−6%, and the -process calculations are in agreement with the latest solar system abundance of 204Pb reported by K. Lodders in 2021.Ministerio de Economía y Competitividad (MINECO). España FPA2014-52823-C2-1/2-P, FPA2017-83946-C2-1/2-PMinisterio de Ciencia, Innovación y Universidades (MICIU). España PID2019–104714 GB-C21, PID2022-138297NB-C21Junta de Andalucía, NeutAndalus 334315European Union (UE). H2020, ChETEC-INFRA—101008324American Physical SocietyMinisterio de Economía y Competitividad (MINECO). EspañaMinisterio de Ciencia, Innovación y Universidades (MICIU). EspañaJunta de AndalucíaEuropean Union (UE). H20202024info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/168930https://doi.org/10.1103/PhysRevLett.133.052702reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésPhysical Review Letters, 133 (5), 052702.FPA2014-52823-C2-1/2-PFPA2017-83946-C2-1/2-PPID2019–104714 GB-C21PID2022-138297NB-C21334315101008324https://doi.org/10.1103/PhysRevLett.133.052702info:eu-repo/semantics/openAccessoai:idus.us.es:11441/1689302026-06-17T12:51:07Z |
| dc.title.none.fl_str_mv |
Shedding Light on the Origin of ^{204}Pb, the Heaviest s-Process-Only Isotope in the Solar System |
| title |
Shedding Light on the Origin of ^{204}Pb, the Heaviest s-Process-Only Isotope in the Solar System |
| spellingShingle |
Shedding Light on the Origin of ^{204}Pb, the Heaviest s-Process-Only Isotope in the Solar System Casanovas-Hoste, A. Nuclear astrophysics Nuclear reaction rates Nuclear reactions Radiative capture s process 190 ≤ A ≤ 219 Nuclear data analysis & compilation Radiation detectors Nuclear reaction rates Nuclear reactions Radiative capture s process 190 ≤ A ≤ 219 Nuclear data analysis & Nuclear reaction rates Nuclear reactions Radiative capture s process 190 ≤ A ≤ 219 Nuclear data analysis |
| title_short |
Shedding Light on the Origin of ^{204}Pb, the Heaviest s-Process-Only Isotope in the Solar System |
| title_full |
Shedding Light on the Origin of ^{204}Pb, the Heaviest s-Process-Only Isotope in the Solar System |
| title_fullStr |
Shedding Light on the Origin of ^{204}Pb, the Heaviest s-Process-Only Isotope in the Solar System |
| title_full_unstemmed |
Shedding Light on the Origin of ^{204}Pb, the Heaviest s-Process-Only Isotope in the Solar System |
| title_sort |
Shedding Light on the Origin of ^{204}Pb, the Heaviest s-Process-Only Isotope in the Solar System |
| dc.creator.none.fl_str_mv |
Casanovas-Hoste, A. Domingo-Pardo, C. Lerendegui Marco, Jorge Guerrero Sánchez, Carlos Tarifeño-Saldivia, A. Krtička, M. Pignatari, M. Cortés Giraldo, Miguel Antonio Quesada Molina, José Manuel Rajeev, K. |
| author |
Casanovas-Hoste, A. |
| author_facet |
Casanovas-Hoste, A. Domingo-Pardo, C. Lerendegui Marco, Jorge Guerrero Sánchez, Carlos Tarifeño-Saldivia, A. Krtička, M. Pignatari, M. Cortés Giraldo, Miguel Antonio Quesada Molina, José Manuel Rajeev, K. |
| author_role |
author |
| author2 |
Domingo-Pardo, C. Lerendegui Marco, Jorge Guerrero Sánchez, Carlos Tarifeño-Saldivia, A. Krtička, M. Pignatari, M. Cortés Giraldo, Miguel Antonio Quesada Molina, José Manuel Rajeev, K. |
| author2_role |
author author author author author author author author author |
| dc.contributor.none.fl_str_mv |
Ministerio de Economía y Competitividad (MINECO). España Ministerio de Ciencia, Innovación y Universidades (MICIU). España Junta de Andalucía European Union (UE). H2020 |
| dc.subject.none.fl_str_mv |
Nuclear astrophysics Nuclear reaction rates Nuclear reactions Radiative capture s process 190 ≤ A ≤ 219 Nuclear data analysis & compilation Radiation detectors Nuclear reaction rates Nuclear reactions Radiative capture s process 190 ≤ A ≤ 219 Nuclear data analysis & Nuclear reaction rates Nuclear reactions Radiative capture s process 190 ≤ A ≤ 219 Nuclear data analysis |
| topic |
Nuclear astrophysics Nuclear reaction rates Nuclear reactions Radiative capture s process 190 ≤ A ≤ 219 Nuclear data analysis & compilation Radiation detectors Nuclear reaction rates Nuclear reactions Radiative capture s process 190 ≤ A ≤ 219 Nuclear data analysis & Nuclear reaction rates Nuclear reactions Radiative capture s process 190 ≤ A ≤ 219 Nuclear data analysis |
| description |
Asymptotic giant branch stars are responsible for the production of most of the heavy isotopes beyond Sr observed in the solar system. Among them, isotopes shielded from the -process contribution by their stable isobars are defined as -only nuclei. For a long time the abundance of 204Pb, the heaviest -only isotope, has been a topic of debate because state-of-the-art stellar models appeared to systematically underestimate its solar abundance. Besides the impact of uncertainties from stellar models and galactic chemical evolution simulations, this discrepancy was further obscured by rather divergent theoretical estimates for the neutron capture cross section of its radioactive precursor in the neutron-capture flow, 204Tl (1/2=3.78 yr), and by the lack of experimental data on this reaction. We present the first ever neutron capture measurement on 204Tl, conducted at the CERN neutron time-of-flight facility n_TOF, employing a sample of only 9 mg of 204Tl produced at the Institute Laue Langevin high flux reactor. By complementing our new results with semiempirical calculations we obtained, at the -process temperatures of ≈8 keV and ≈30 keV, Maxwellian-averaged cross sections (MACS) of 580(168) mb and 260(90) mb, respectively. These figures are about 3% lower and 20% higher than the corresponding values widely used in astrophysical calculations, which were based only on theoretical calculations. By using the new 204Tl MACS, the uncertainty arising from the 204Tl(n,) cross section on the -process abundance of 204Pb has been reduced from ∼30% down to +8%/−6%, and the -process calculations are in agreement with the latest solar system abundance of 204Pb reported by K. Lodders in 2021. |
| publishDate |
2024 |
| dc.date.none.fl_str_mv |
2024 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| format |
article |
| status_str |
publishedVersion |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/11441/168930 https://doi.org/10.1103/PhysRevLett.133.052702 |
| url |
https://hdl.handle.net/11441/168930 https://doi.org/10.1103/PhysRevLett.133.052702 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
Physical Review Letters, 133 (5), 052702. FPA2014-52823-C2-1/2-P FPA2017-83946-C2-1/2-P PID2019–104714 GB-C21 PID2022-138297NB-C21 334315 101008324 https://doi.org/10.1103/PhysRevLett.133.052702 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf application/pdf |
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American Physical Society |
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American Physical Society |
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reponame:idUS. Depósito de Investigación de la Universidad de Sevilla instname:Universidad de Sevilla (US) |
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Universidad de Sevilla (US) |
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