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 = Γn/Γp 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
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/84871
Ver los metadatos del registro completo
id |
SEDICI_17eac66f036960ddb5a36c9d711558e7 |
---|---|
oai_identifier_str |
oai:sedici.unlp.edu.ar:10915/84871 |
network_acronym_str |
SEDICI |
repository_id_str |
1329 |
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 |
repository.mail.fl_str_mv |
alira@sedici.unlp.edu.ar |
_version_ |
1844616035283501056 |
score |
13.070432 |