Impact of neutrino oscillations on the r-process in different astrophysical scenarios
In this work, we studied the production of heavy-mass elements, through the rapid neutron-capture mechanism (r-process), associated with different astrophysical scenarios. Since the r-process consists on captures of neutrons followed by /3-decays, if sterile neutrinos exist, a reformulation of the w...
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2021
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/176396 |
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I19-R120-10915-1763962025-02-11T20:04:35Z http://sedici.unlp.edu.ar/handle/10915/176396 Impact of neutrino oscillations on the r-process in different astrophysical scenarios Sáez, María Manuela Fushimi, Keiko Juliana Mosquera, Mercedes Elisa Civitarese, Enrique Osvaldo 2021 2025-02-11T18:22:27Z en Ciencias Astronómicas astroparticle physics neutrinos nuclear reactions, nucleosynthesis, abundances In this work, we studied the production of heavy-mass elements, through the rapid neutron-capture mechanism (r-process), associated with different astrophysical scenarios. Since the r-process consists on captures of neutrons followed by /3-decays, if sterile neutrinos exist, a reformulation of the weak-decay rates due to the presence of massive neutrinos and sterile neutrinos, is needed. These rates are used to compute the abundances of the heavy elements produced in core-collapse supernova and neutron-star mergers and then ejected to the interstellar medium. We show how the abundances are affected if the active-sterile neutrino oscillations are considered in the formalism. We found that the best agreement between theoretical and experimental data is given when active-sterile neutrino mixing angle is sin2 (2^14) = 0.23 and when the neutron-star merger environment is dominant (about 70% of the production of the total heavy nuclei abundance). En este trabajo, estudiamos la producción de elementos pesados a través del mecanismo de captura rápida de neutrones (proceso-r), asociado a diferentes escenarios astrofísicos. Como el proceso-r consiste en la captura de neutrones seguida de decaimientos β, si los neutrinos estériles existen, es necesaria una reformulación de las tasas de desintegración débil debido a la presencia de neutrinos masivos y estériles. Estas tasas se utilizan en las cadenas de reacciones para el cálculo de abundancias de elementos pesados (por ejemplo en supernovas por colapso de núcleo y fusiones de estrellas de neutrones) que luego son expulsados al medio interestelar. Mostramos cómo se ven afectadas las abundancias si las oscilaciones de neutrinos activo-estériles son consideradas en el formalismo. Encontramos que nuestros resultados teóricos reproducen mejor las observaciones cuando consideramos un ángulo de mezcla de neutrinos activo-estéril de sin2 (2^44) = 0.23 y como fuente dominante a la fusión de estrellas de neutrones (responsable del 70% de la abundancia total de núcleos pesados). Asociación Argentina de Astronomía Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 259-261 |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Astronómicas astroparticle physics neutrinos nuclear reactions, nucleosynthesis, abundances |
| spellingShingle |
Ciencias Astronómicas astroparticle physics neutrinos nuclear reactions, nucleosynthesis, abundances Sáez, María Manuela Fushimi, Keiko Juliana Mosquera, Mercedes Elisa Civitarese, Enrique Osvaldo Impact of neutrino oscillations on the r-process in different astrophysical scenarios |
| topic_facet |
Ciencias Astronómicas astroparticle physics neutrinos nuclear reactions, nucleosynthesis, abundances |
| description |
In this work, we studied the production of heavy-mass elements, through the rapid neutron-capture mechanism (r-process), associated with different astrophysical scenarios. Since the r-process consists on captures of neutrons followed by /3-decays, if sterile neutrinos exist, a reformulation of the weak-decay rates due to the presence of massive neutrinos and sterile neutrinos, is needed. These rates are used to compute the abundances of the heavy elements produced in core-collapse supernova and neutron-star mergers and then ejected to the interstellar medium. We show how the abundances are affected if the active-sterile neutrino oscillations are considered in the formalism. We found that the best agreement between theoretical and experimental data is given when active-sterile neutrino mixing angle is sin2 (2^14) = 0.23 and when the neutron-star merger environment is dominant (about 70% of the production of the total heavy nuclei abundance). |
| format |
Articulo Articulo |
| author |
Sáez, María Manuela Fushimi, Keiko Juliana Mosquera, Mercedes Elisa Civitarese, Enrique Osvaldo |
| author_facet |
Sáez, María Manuela Fushimi, Keiko Juliana Mosquera, Mercedes Elisa Civitarese, Enrique Osvaldo |
| author_sort |
Sáez, María Manuela |
| title |
Impact of neutrino oscillations on the r-process in different astrophysical scenarios |
| title_short |
Impact of neutrino oscillations on the r-process in different astrophysical scenarios |
| title_full |
Impact of neutrino oscillations on the r-process in different astrophysical scenarios |
| title_fullStr |
Impact of neutrino oscillations on the r-process in different astrophysical scenarios |
| title_full_unstemmed |
Impact of neutrino oscillations on the r-process in different astrophysical scenarios |
| title_sort |
impact of neutrino oscillations on the r-process in different astrophysical scenarios |
| publishDate |
2021 |
| url |
http://sedici.unlp.edu.ar/handle/10915/176396 |
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AT saezmariamanuela impactofneutrinooscillationsontherprocessindifferentastrophysicalscenarios AT fushimikeikojuliana impactofneutrinooscillationsontherprocessindifferentastrophysicalscenarios AT mosqueramercedeselisa impactofneutrinooscillationsontherprocessindifferentastrophysicalscenarios AT civitareseenriqueosvaldo impactofneutrinooscillationsontherprocessindifferentastrophysicalscenarios |
| _version_ |
1847019279780675584 |