Nuclear structure in nonmesonic weak decay of hypernuclei

Autores
Krmpotic, Francisco; Tadić, D.
Año de publicación
2003
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
A general shell model formalism for the nonmesonic weak decay of the hypernuclei has been developed. It involves a partial wave expansion of the emitted nucleon waves, preserves naturally the antisymmetrization between the escaping particles and the residual core, and contains as a particular case the weak Λ-core coupling formalism. The hypernuclei are grouped having in view their A-1 cores, that is in those with even-even, even-odd and odd-odd cores. It is shown that in all three cases the nuclear structure manifests itself basically through Pauli Principle, and very simple expressions are derived for the neutron and proton induced decays rates Γn and Γp, which does not involve the spectroscopic factors. For the strangeness-Changing weak ΛN → NN transition potential we use the One-Meson-Exchange Model (OMEM), which comprises the exchange of the complete pseudoscalar and vector meson octets (π,η, K, ρ, ω, K*). We evaluate 3H, 4H 4ΛHe, 5ΛHe,11B, 12ΛC, 16ΛO, 17ΛO, and 28ΛSi hypernuclei, with commonly used parametrization for the OMEM, and compare the results with the available experimental information, The calculated rates ΓNM = Γn + Γp are consistent with the data, but the measurements of Γn/p = Γnp are not well accounted for by the theory. It is suggested that, unless additional degrees of freedom are incorporated, the OMEM parameters should be radically modified.
Facultad de Ciencias Exactas
Materia
Ciencias Exactas
Física
nonmesonic weak decay
hypernuclei
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/84871

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network_name_str SEDICI (UNLP)
spelling Nuclear structure in nonmesonic weak decay of hypernucleiKrmpotic, FranciscoTadić, D.Ciencias ExactasFísicanonmesonic weak decayhypernucleiA general shell model formalism for the nonmesonic weak decay of the hypernuclei has been developed. It involves a partial wave expansion of the emitted nucleon waves, preserves naturally the antisymmetrization between the escaping particles and the residual core, and contains as a particular case the weak Λ-core coupling formalism. The hypernuclei are grouped having in view their A-1 cores, that is in those with even-even, even-odd and odd-odd cores. It is shown that in all three cases the nuclear structure manifests itself basically through Pauli Principle, and very simple expressions are derived for the neutron and proton induced decays rates Γ<SUB>n</SUB> and Γ<SUB>p</SUB>, which does not involve the spectroscopic factors. For the strangeness-Changing weak ΛN → NN transition potential we use the One-Meson-Exchange Model (OMEM), which comprises the exchange of the complete pseudoscalar and vector meson octets (π,η, K, ρ, ω, K*). We evaluate <SUP>3</SUP>H, <SUP>4</SUP>H <SUP>4</SUP><SUB>Λ</SUB>He, <SUP>5</SUP><SUB>Λ</SUB>He,<SUP>11</SUP>B, <SUP>12</SUP><SUB>Λ</SUB>C, <SUP>16</SUP><SUB>Λ</SUB>O, <SUP>17</SUP><SUB>Λ</SUB>O, and <SUP>28</SUP><SUB>Λ</SUB>Si hypernuclei, with commonly used parametrization for the OMEM, and compare the results with the available experimental information, The calculated rates Γ<SUB>NM</SUB> = Γ<SUB>n</SUB> + Γ<SUB>p</SUB> are consistent with the data, but the measurements of Γ<SUB>n/p</SUB> = Γ<SUB>n</SUB>/Γ<SUB>p</SUB> are not well accounted for by the theory. It is suggested that, unless additional degrees of freedom are incorporated, the OMEM parameters should be radically modified.Facultad de Ciencias Exactas2003info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf187-194http://sedici.unlp.edu.ar/handle/10915/84871enginfo:eu-repo/semantics/altIdentifier/issn/0103-9733info:eu-repo/semantics/altIdentifier/doi/10.1590/S0103-97332003000200005info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:16:15Zoai:sedici.unlp.edu.ar:10915/84871Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:16:16.189SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Nuclear structure in nonmesonic weak decay of hypernuclei
title Nuclear structure in nonmesonic weak decay of hypernuclei
spellingShingle Nuclear structure in nonmesonic weak decay of hypernuclei
Krmpotic, Francisco
Ciencias Exactas
Física
nonmesonic weak decay
hypernuclei
title_short Nuclear structure in nonmesonic weak decay of hypernuclei
title_full Nuclear structure in nonmesonic weak decay of hypernuclei
title_fullStr Nuclear structure in nonmesonic weak decay of hypernuclei
title_full_unstemmed Nuclear structure in nonmesonic weak decay of hypernuclei
title_sort Nuclear structure in nonmesonic weak decay of hypernuclei
dc.creator.none.fl_str_mv Krmpotic, Francisco
Tadić, D.
author Krmpotic, Francisco
author_facet Krmpotic, Francisco
Tadić, D.
author_role author
author2 Tadić, D.
author2_role author
dc.subject.none.fl_str_mv Ciencias Exactas
Física
nonmesonic weak decay
hypernuclei
topic Ciencias Exactas
Física
nonmesonic weak decay
hypernuclei
dc.description.none.fl_txt_mv A general shell model formalism for the nonmesonic weak decay of the hypernuclei has been developed. It involves a partial wave expansion of the emitted nucleon waves, preserves naturally the antisymmetrization between the escaping particles and the residual core, and contains as a particular case the weak Λ-core coupling formalism. The hypernuclei are grouped having in view their A-1 cores, that is in those with even-even, even-odd and odd-odd cores. It is shown that in all three cases the nuclear structure manifests itself basically through Pauli Principle, and very simple expressions are derived for the neutron and proton induced decays rates Γ<SUB>n</SUB> and Γ<SUB>p</SUB>, which does not involve the spectroscopic factors. For the strangeness-Changing weak ΛN → NN transition potential we use the One-Meson-Exchange Model (OMEM), which comprises the exchange of the complete pseudoscalar and vector meson octets (π,η, K, ρ, ω, K*). We evaluate <SUP>3</SUP>H, <SUP>4</SUP>H <SUP>4</SUP><SUB>Λ</SUB>He, <SUP>5</SUP><SUB>Λ</SUB>He,<SUP>11</SUP>B, <SUP>12</SUP><SUB>Λ</SUB>C, <SUP>16</SUP><SUB>Λ</SUB>O, <SUP>17</SUP><SUB>Λ</SUB>O, and <SUP>28</SUP><SUB>Λ</SUB>Si hypernuclei, with commonly used parametrization for the OMEM, and compare the results with the available experimental information, The calculated rates Γ<SUB>NM</SUB> = Γ<SUB>n</SUB> + Γ<SUB>p</SUB> are consistent with the data, but the measurements of Γ<SUB>n/p</SUB> = Γ<SUB>n</SUB>/Γ<SUB>p</SUB> are not well accounted for by the theory. It is suggested that, unless additional degrees of freedom are incorporated, the OMEM parameters should be radically modified.
Facultad de Ciencias Exactas
description A general shell model formalism for the nonmesonic weak decay of the hypernuclei has been developed. It involves a partial wave expansion of the emitted nucleon waves, preserves naturally the antisymmetrization between the escaping particles and the residual core, and contains as a particular case the weak Λ-core coupling formalism. The hypernuclei are grouped having in view their A-1 cores, that is in those with even-even, even-odd and odd-odd cores. It is shown that in all three cases the nuclear structure manifests itself basically through Pauli Principle, and very simple expressions are derived for the neutron and proton induced decays rates Γ<SUB>n</SUB> and Γ<SUB>p</SUB>, which does not involve the spectroscopic factors. For the strangeness-Changing weak ΛN → NN transition potential we use the One-Meson-Exchange Model (OMEM), which comprises the exchange of the complete pseudoscalar and vector meson octets (π,η, K, ρ, ω, K*). We evaluate <SUP>3</SUP>H, <SUP>4</SUP>H <SUP>4</SUP><SUB>Λ</SUB>He, <SUP>5</SUP><SUB>Λ</SUB>He,<SUP>11</SUP>B, <SUP>12</SUP><SUB>Λ</SUB>C, <SUP>16</SUP><SUB>Λ</SUB>O, <SUP>17</SUP><SUB>Λ</SUB>O, and <SUP>28</SUP><SUB>Λ</SUB>Si hypernuclei, with commonly used parametrization for the OMEM, and compare the results with the available experimental information, The calculated rates Γ<SUB>NM</SUB> = Γ<SUB>n</SUB> + Γ<SUB>p</SUB> are consistent with the data, but the measurements of Γ<SUB>n/p</SUB> = Γ<SUB>n</SUB>/Γ<SUB>p</SUB> are not well accounted for by the theory. It is suggested that, unless additional degrees of freedom are incorporated, the OMEM parameters should be radically modified.
publishDate 2003
dc.date.none.fl_str_mv 2003
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/84871
url http://sedici.unlp.edu.ar/handle/10915/84871
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0103-9733
info:eu-repo/semantics/altIdentifier/doi/10.1590/S0103-97332003000200005
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
187-194
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
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