Nonmesonic weak decay of double- Λ hypernuclei: A microscopic approach

Autores
Bauer, Eduardo; Garbarino, G.; Rodríguez Peña, Carlos Andrés
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The nonmesonic weak decay of double-Λ hypernuclei is studied within a microscopic diagrammatic approach. In addition to the nucleon-induced mechanism, ΛN→nN and ΛNN→nNN, widely studied in single-Λ hypernuclei, additional hyperon-induced mechanisms, ΛΛ→Λn, ΛΛ→Σ0n, and ΛΛ→Σ-p, are accessible in double-Λ hypernuclei and are investigated here. As in previous works on single-Λ hypernuclei, we adopt a nuclear matter formalism extended to finite nuclei via the local density approximation and a one-meson exchange weak transition potential (including the ground-state pseudoscalar and vector octets mesons) supplemented by correlated and uncorrelated two-pion-exchange contributions. The weak decay rates are evaluated for hypernuclei in the region of the experimentally accessible light hypernuclei ΛΛ10Be and ΛΛ13B. Our predictions are compared with a few previous evaluations. The rate for the ΛΛ→Λn decay is dominated by K-, K∗-, and η-exchange and turns out to be about 2.5% of the free Λ decay rate, ΓΛfree, while the total rate for the ΛΛ→Σ0n and ΛΛ→Σ-p decays, dominated by π-exchange, amounts to about 0.25% of ΓΛfree. The experimental measurement of these decays would be essential for the beginning of a systematic study of the nonmesonic decay of strangeness -2 hypernuclei. This field of research could also shed light on the possible existence and nature of the H dibaryon.
Fil: Bauer, Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; Argentina
Fil: Garbarino, G.. IIS G. Peano; Italia
Fil: Rodríguez Peña, Carlos Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de Física; Argentina
Materia
Hypernuclei
Non-Mesonic Weak Decay
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/50713
Acceder
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repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Nonmesonic weak decay of double- Λ hypernuclei: A microscopic approachBauer, EduardoGarbarino, G.Rodríguez Peña, Carlos AndrésHypernucleiNon-Mesonic Weak Decayhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1The nonmesonic weak decay of double-Λ hypernuclei is studied within a microscopic diagrammatic approach. In addition to the nucleon-induced mechanism, ΛN→nN and ΛNN→nNN, widely studied in single-Λ hypernuclei, additional hyperon-induced mechanisms, ΛΛ→Λn, ΛΛ→Σ0n, and ΛΛ→Σ-p, are accessible in double-Λ hypernuclei and are investigated here. As in previous works on single-Λ hypernuclei, we adopt a nuclear matter formalism extended to finite nuclei via the local density approximation and a one-meson exchange weak transition potential (including the ground-state pseudoscalar and vector octets mesons) supplemented by correlated and uncorrelated two-pion-exchange contributions. The weak decay rates are evaluated for hypernuclei in the region of the experimentally accessible light hypernuclei ΛΛ10Be and ΛΛ13B. Our predictions are compared with a few previous evaluations. The rate for the ΛΛ→Λn decay is dominated by K-, K∗-, and η-exchange and turns out to be about 2.5% of the free Λ decay rate, ΓΛfree, while the total rate for the ΛΛ→Σ0n and ΛΛ→Σ-p decays, dominated by π-exchange, amounts to about 0.25% of ΓΛfree. The experimental measurement of these decays would be essential for the beginning of a systematic study of the nonmesonic decay of strangeness -2 hypernuclei. This field of research could also shed light on the possible existence and nature of the H dibaryon.Fil: Bauer, Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; ArgentinaFil: Garbarino, G.. IIS G. Peano; ItaliaFil: Rodríguez Peña, Carlos Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de Física; ArgentinaAmerican Physical Society2015-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/50713Bauer, Eduardo; Garbarino, G.; Rodríguez Peña, Carlos Andrés; Nonmesonic weak decay of double- Λ hypernuclei: A microscopic approach; American Physical Society; Physical Review C: Nuclear Physics; 92; 1; 7-2015; 14301-143100556-2813CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevC.92.014301info:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/prc/abstract/10.1103/PhysRevC.92.014301info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:53:01Zoai:ri.conicet.gov.ar:11336/50713instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:53:01.658CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Nonmesonic weak decay of double- Λ hypernuclei: A microscopic approach
title Nonmesonic weak decay of double- Λ hypernuclei: A microscopic approach
spellingShingle Nonmesonic weak decay of double- Λ hypernuclei: A microscopic approach
Bauer, Eduardo
Hypernuclei
Non-Mesonic Weak Decay
title_short Nonmesonic weak decay of double- Λ hypernuclei: A microscopic approach
title_full Nonmesonic weak decay of double- Λ hypernuclei: A microscopic approach
title_fullStr Nonmesonic weak decay of double- Λ hypernuclei: A microscopic approach
title_full_unstemmed Nonmesonic weak decay of double- Λ hypernuclei: A microscopic approach
title_sort Nonmesonic weak decay of double- Λ hypernuclei: A microscopic approach
dc.creator.none.fl_str_mv Bauer, Eduardo
Garbarino, G.
Rodríguez Peña, Carlos Andrés
author Bauer, Eduardo
author_facet Bauer, Eduardo
Garbarino, G.
Rodríguez Peña, Carlos Andrés
author_role author
author2 Garbarino, G.
Rodríguez Peña, Carlos Andrés
author2_role author
author
dc.subject.none.fl_str_mv Hypernuclei
Non-Mesonic Weak Decay
topic Hypernuclei
Non-Mesonic Weak Decay
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The nonmesonic weak decay of double-Λ hypernuclei is studied within a microscopic diagrammatic approach. In addition to the nucleon-induced mechanism, ΛN→nN and ΛNN→nNN, widely studied in single-Λ hypernuclei, additional hyperon-induced mechanisms, ΛΛ→Λn, ΛΛ→Σ0n, and ΛΛ→Σ-p, are accessible in double-Λ hypernuclei and are investigated here. As in previous works on single-Λ hypernuclei, we adopt a nuclear matter formalism extended to finite nuclei via the local density approximation and a one-meson exchange weak transition potential (including the ground-state pseudoscalar and vector octets mesons) supplemented by correlated and uncorrelated two-pion-exchange contributions. The weak decay rates are evaluated for hypernuclei in the region of the experimentally accessible light hypernuclei ΛΛ10Be and ΛΛ13B. Our predictions are compared with a few previous evaluations. The rate for the ΛΛ→Λn decay is dominated by K-, K∗-, and η-exchange and turns out to be about 2.5% of the free Λ decay rate, ΓΛfree, while the total rate for the ΛΛ→Σ0n and ΛΛ→Σ-p decays, dominated by π-exchange, amounts to about 0.25% of ΓΛfree. The experimental measurement of these decays would be essential for the beginning of a systematic study of the nonmesonic decay of strangeness -2 hypernuclei. This field of research could also shed light on the possible existence and nature of the H dibaryon.
Fil: Bauer, Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; Argentina
Fil: Garbarino, G.. IIS G. Peano; Italia
Fil: Rodríguez Peña, Carlos Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Departamento de Física; Argentina
description The nonmesonic weak decay of double-Λ hypernuclei is studied within a microscopic diagrammatic approach. In addition to the nucleon-induced mechanism, ΛN→nN and ΛNN→nNN, widely studied in single-Λ hypernuclei, additional hyperon-induced mechanisms, ΛΛ→Λn, ΛΛ→Σ0n, and ΛΛ→Σ-p, are accessible in double-Λ hypernuclei and are investigated here. As in previous works on single-Λ hypernuclei, we adopt a nuclear matter formalism extended to finite nuclei via the local density approximation and a one-meson exchange weak transition potential (including the ground-state pseudoscalar and vector octets mesons) supplemented by correlated and uncorrelated two-pion-exchange contributions. The weak decay rates are evaluated for hypernuclei in the region of the experimentally accessible light hypernuclei ΛΛ10Be and ΛΛ13B. Our predictions are compared with a few previous evaluations. The rate for the ΛΛ→Λn decay is dominated by K-, K∗-, and η-exchange and turns out to be about 2.5% of the free Λ decay rate, ΓΛfree, while the total rate for the ΛΛ→Σ0n and ΛΛ→Σ-p decays, dominated by π-exchange, amounts to about 0.25% of ΓΛfree. The experimental measurement of these decays would be essential for the beginning of a systematic study of the nonmesonic decay of strangeness -2 hypernuclei. This field of research could also shed light on the possible existence and nature of the H dibaryon.
publishDate 2015
dc.date.none.fl_str_mv 2015-07
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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://hdl.handle.net/11336/50713
Bauer, Eduardo; Garbarino, G.; Rodríguez Peña, Carlos Andrés; Nonmesonic weak decay of double- Λ hypernuclei: A microscopic approach; American Physical Society; Physical Review C: Nuclear Physics; 92; 1; 7-2015; 14301-14310
0556-2813
CONICET Digital
CONICET
url http://hdl.handle.net/11336/50713
identifier_str_mv Bauer, Eduardo; Garbarino, G.; Rodríguez Peña, Carlos Andrés; Nonmesonic weak decay of double- Λ hypernuclei: A microscopic approach; American Physical Society; Physical Review C: Nuclear Physics; 92; 1; 7-2015; 14301-14310
0556-2813
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevC.92.014301
info:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/prc/abstract/10.1103/PhysRevC.92.014301
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.13397

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