Ground- and excited-state calculations of cluster radioactivity and alpha decay

The present work presents calculations for different aspects of alpha and cluster decay within a preformed cluster model where the light cluster is considered to tunnel the Coulomb barrier formed by its interaction with the heavy daughter nucleus. In the models used to study such decay, the effectiv...

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Autores:
Rojas Gamboa, Diego Ferney
Tipo de recurso:
Doctoral thesis
Fecha de publicación:
2022
Institución:
Universidad de los Andes
Repositorio:
Séneca: repositorio Uniandes
Idioma:
eng
OAI Identifier:
oai:repositorio.uniandes.edu.co:1992/64152
Acceso en línea:
http://hdl.handle.net/1992/64152
Palabra clave:
Nuclear physics
Nuclear structure
Half-life
Cluster decay
Alpha decay
Radioactivity
Física
Rights
openAccess
License
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
id UNIANDES2_705b664ed5ff0afab527047963173730
oai_identifier_str oai:repositorio.uniandes.edu.co:1992/64152
network_acronym_str UNIANDES2
network_name_str Séneca: repositorio Uniandes
repository_id_str
dc.title.none.fl_str_mv Ground- and excited-state calculations of cluster radioactivity and alpha decay
dc.title.alternative.none.fl_str_mv Ground- and excited-state calculations of cluster radioactivity and alpha decay
title Ground- and excited-state calculations of cluster radioactivity and alpha decay
spellingShingle Ground- and excited-state calculations of cluster radioactivity and alpha decay
Nuclear physics
Nuclear structure
Half-life
Cluster decay
Alpha decay
Radioactivity
Física
title_short Ground- and excited-state calculations of cluster radioactivity and alpha decay
title_full Ground- and excited-state calculations of cluster radioactivity and alpha decay
title_fullStr Ground- and excited-state calculations of cluster radioactivity and alpha decay
title_full_unstemmed Ground- and excited-state calculations of cluster radioactivity and alpha decay
title_sort Ground- and excited-state calculations of cluster radioactivity and alpha decay
dc.creator.fl_str_mv Rojas Gamboa, Diego Ferney
dc.contributor.advisor.none.fl_str_mv Kelkar, Neelima Govind
dc.contributor.author.none.fl_str_mv Rojas Gamboa, Diego Ferney
dc.contributor.jury.none.fl_str_mv Guimarães, Valdir
Bertulani, Carlos A.
dc.contributor.researchgroup.es_CO.fl_str_mv Grupo de Física de Altas Energías
dc.subject.keyword.none.fl_str_mv Nuclear physics
Nuclear structure
Half-life
Cluster decay
Alpha decay
Radioactivity
topic Nuclear physics
Nuclear structure
Half-life
Cluster decay
Alpha decay
Radioactivity
Física
dc.subject.themes.es_CO.fl_str_mv Física
description The present work presents calculations for different aspects of alpha and cluster decay within a preformed cluster model where the light cluster is considered to tunnel the Coulomb barrier formed by its interaction with the heavy daughter nucleus. In the models used to study such decay, the effective interaction between the daughter nucleus and alpha is an essential ingredient for the proper determination of the nuclear potential used for evaluating half-lives. A good interaction potential must include effects due to nonlocal interactions and deformations in the shapes of the nuclei if necessary. For nucleon-nucleus scattering processes, the nonlocality has been characterized in different ways such as by introducing energy or velocity-dependent local equivalent potentials, a coordinate-dependent mass, or by modifying the nuclear density distribution. In this work, a comparison of the alpha and cluster decay half-lives using different nonlocal approaches are performed for deformed and spherical nuclei. The sensitivity of the results can provide a complementary tool for improving the models of the nonlocal interaction which are usually constrained by reaction data. Though the measured branching ratios of cluster radioactivity as compared to alpha decay are very small, the former rare decay may become important in hot environments such as those encountered in the nucleosynthesis of heavy elements. The r-process nucleosynthesis path is along highly unstable, exotic, and neutron-rich nuclei. Thus, the decay rates and fission, as well as the photo-dissociation and neutron capture cross sections, are important for the abundance evolution. The explosive conditions in supernovae and neutron star mergers leading to considerably high temperatures could result in nuclei existing in excited states. Though the possible influence of these nuclear thermal excitations is taken into account in the production reactions as well as in their reverse reactions, with libraries publicly available for the scientific community, the same is not true in the case of alpha and cluster decay. In order to include these effects, a model for the alpha and cluster decay of excited nuclei is developed in this work. Empirical formulae or universal decay laws obtained by performing fits to available data of excited nuclei are also provided. The latter can eventually be useful for nucleosynthesis calculations. Finally, an important aspect of such studies is the knowledge of cluster preformation probability. Phenomenological calculations of the preformation factors in several known alpha and cluster decays are presented.
publishDate 2022
dc.date.issued.none.fl_str_mv 2022-12-05
dc.date.accessioned.none.fl_str_mv 2023-01-25T15:58:49Z
dc.date.available.none.fl_str_mv 2023-01-25T15:58:49Z
dc.type.es_CO.fl_str_mv Trabajo de grado - Doctorado
dc.type.driver.none.fl_str_mv info:eu-repo/semantics/doctoralThesis
dc.type.version.none.fl_str_mv info:eu-repo/semantics/acceptedVersion
dc.type.coar.none.fl_str_mv http://purl.org/coar/resource_type/c_db06
dc.type.content.es_CO.fl_str_mv Text
dc.type.redcol.none.fl_str_mv https://purl.org/redcol/resource_type/TD
format http://purl.org/coar/resource_type/c_db06
status_str acceptedVersion
dc.identifier.uri.none.fl_str_mv http://hdl.handle.net/1992/64152
dc.identifier.doi.none.fl_str_mv 10.57784/1992/64152
dc.identifier.instname.es_CO.fl_str_mv instname:Universidad de los Andes
dc.identifier.reponame.es_CO.fl_str_mv reponame:Repositorio Institucional Séneca
dc.identifier.repourl.es_CO.fl_str_mv repourl:https://repositorio.uniandes.edu.co/
url http://hdl.handle.net/1992/64152
identifier_str_mv 10.57784/1992/64152
instname:Universidad de los Andes
reponame:Repositorio Institucional Séneca
repourl:https://repositorio.uniandes.edu.co/
dc.language.iso.es_CO.fl_str_mv eng
language eng
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spelling Attribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2Kelkar, Neelima Govindd67a3f47-470f-4f5e-9180-973932961e28600Rojas Gamboa, Diego Ferney10262600Guimarães, ValdirBertulani, Carlos A.Grupo de Física de Altas Energías2023-01-25T15:58:49Z2023-01-25T15:58:49Z2022-12-05http://hdl.handle.net/1992/6415210.57784/1992/64152instname:Universidad de los Andesreponame:Repositorio Institucional Sénecarepourl:https://repositorio.uniandes.edu.co/The present work presents calculations for different aspects of alpha and cluster decay within a preformed cluster model where the light cluster is considered to tunnel the Coulomb barrier formed by its interaction with the heavy daughter nucleus. In the models used to study such decay, the effective interaction between the daughter nucleus and alpha is an essential ingredient for the proper determination of the nuclear potential used for evaluating half-lives. A good interaction potential must include effects due to nonlocal interactions and deformations in the shapes of the nuclei if necessary. For nucleon-nucleus scattering processes, the nonlocality has been characterized in different ways such as by introducing energy or velocity-dependent local equivalent potentials, a coordinate-dependent mass, or by modifying the nuclear density distribution. In this work, a comparison of the alpha and cluster decay half-lives using different nonlocal approaches are performed for deformed and spherical nuclei. The sensitivity of the results can provide a complementary tool for improving the models of the nonlocal interaction which are usually constrained by reaction data. Though the measured branching ratios of cluster radioactivity as compared to alpha decay are very small, the former rare decay may become important in hot environments such as those encountered in the nucleosynthesis of heavy elements. The r-process nucleosynthesis path is along highly unstable, exotic, and neutron-rich nuclei. Thus, the decay rates and fission, as well as the photo-dissociation and neutron capture cross sections, are important for the abundance evolution. The explosive conditions in supernovae and neutron star mergers leading to considerably high temperatures could result in nuclei existing in excited states. Though the possible influence of these nuclear thermal excitations is taken into account in the production reactions as well as in their reverse reactions, with libraries publicly available for the scientific community, the same is not true in the case of alpha and cluster decay. In order to include these effects, a model for the alpha and cluster decay of excited nuclei is developed in this work. Empirical formulae or universal decay laws obtained by performing fits to available data of excited nuclei are also provided. The latter can eventually be useful for nucleosynthesis calculations. Finally, an important aspect of such studies is the knowledge of cluster preformation probability. 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