Limits on active-sterile neutrino mixing parameters using heavy nuclei abundances

The production of heavy-mass elements due to the rapid neutron-capture mechanism (r-process) is associated with astrophysical scenarios, such as supernovae and neutron-star mergers. In the r-process the capture of neutrons is followed by β-decays until nuclear stability is reached. A key element in...

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Detalles Bibliográficos
Autores principales:	Sáez, María Manuela, Fushimi, Keiko Juliana, Mosquera, Mercedes Elisa, Civitarese, Enrique Osvaldo
Formato:	Articulo Preprint
Lenguaje:	Inglés
Publicado:	2021
Materias:	Astronomía Física Nuclear reactions nucleo-synthesis sterile neutrinos supernovas neutron-star mergers
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/140465
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-140465
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Astronomía Física Nuclear reactions nucleo-synthesis sterile neutrinos supernovas neutron-star mergers
spellingShingle	Astronomía Física Nuclear reactions nucleo-synthesis sterile neutrinos supernovas neutron-star mergers Sáez, María Manuela Fushimi, Keiko Juliana Mosquera, Mercedes Elisa Civitarese, Enrique Osvaldo Limits on active-sterile neutrino mixing parameters using heavy nuclei abundances
topic_facet	Astronomía Física Nuclear reactions nucleo-synthesis sterile neutrinos supernovas neutron-star mergers
description	The production of heavy-mass elements due to the rapid neutron-capture mechanism (r-process) is associated with astrophysical scenarios, such as supernovae and neutron-star mergers. In the r-process the capture of neutrons is followed by β-decays until nuclear stability is reached. A key element in the chain of nuclear weak-decays leading to the production of isotopes may be the change of the parameters controlling the neutrino sector, due to the mixing of active and sterile species. In this work, we have addressed this question and calculated β-decay rates for the nuclei involved in the r-process chains as a function of the neutrino mixing parameters. These rates are then used in the calculation of the abundance of the heavy elements produced in core-collapse supernova and in neutron-star mergers, starting from different initial mass-fraction distributions. The analysis shows that the core-collapse supernova environment contributes with approximately 30% of the total heavy nuclei abundance while the neutron-star merger contributes with about 70% of it. Using available experimental data we have performed a statistical analysis to set limits on the active-sterile neutrino mixing angle and found a best-fit value sin22θ14=0.22, a value comparable with those found in other studies reported in the literature.
format	Articulo Preprint
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	Limits on active-sterile neutrino mixing parameters using heavy nuclei abundances
title_short	Limits on active-sterile neutrino mixing parameters using heavy nuclei abundances
title_full	Limits on active-sterile neutrino mixing parameters using heavy nuclei abundances
title_fullStr	Limits on active-sterile neutrino mixing parameters using heavy nuclei abundances
title_full_unstemmed	Limits on active-sterile neutrino mixing parameters using heavy nuclei abundances
title_sort	limits on active-sterile neutrino mixing parameters using heavy nuclei abundances
publishDate	2021
url	http://sedici.unlp.edu.ar/handle/10915/140465
work_keys_str_mv	AT saezmariamanuela limitsonactivesterileneutrinomixingparametersusingheavynucleiabundances AT fushimikeikojuliana limitsonactivesterileneutrinomixingparametersusingheavynucleiabundances AT mosqueramercedeselisa limitsonactivesterileneutrinomixingparametersusingheavynucleiabundances AT civitareseenriqueosvaldo limitsonactivesterileneutrinomixingparametersusingheavynucleiabundances
bdutipo_str	Repositorios
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Limits on active-sterile neutrino mixing parameters using heavy nuclei abundances

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