Asymmetry parameter for nonmesonic hypernuclear decay
- Autores
- Barbero, César Alberto; Galeao, A. P.; Krmpotić, Francisco
- Año de publicación
- 2005
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- We give general expressions for the vector asymmetry in the angular distribution of protons in the nonmesonic weak decay of polarized hypernuclei. From these we derive an explicit expression for the calculation of the asymmetry parameter, aΛ, which is applicable to the specific cases of ⁵ΛHe and ¹²ΛC described within the extreme shell model. In contrast to the approximate formula widely used in the literature, it includes the effects of three-body kinematics in the final states of the decay and correctly treats the contribution of transitions originating from single-proton states beyond the s-shell. This expression is then used for the corresponding numerical computation of aΛ within several one-meson-exchange models. Besides the strictly local approximation usually adopted for the transition potential, we also consider the addition of the first-order nonlocality terms. We find values for aΛ ranging from -0.62 to -0.24, in qualitative agreement with other theoretical estimates but in contradiction with some recent experimental determinations.
Facultad de Ciencias Exactas - Materia
-
Física
Particle physics
Lambda baryon
Physics
Carbon-12
Quantum nonlocality
Radioactive decay
Lambda
Three-body problem
Asymmetry
Computation - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
.jpg)
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/126153
Ver los metadatos del registro completo
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Asymmetry parameter for nonmesonic hypernuclear decayBarbero, César AlbertoGaleao, A. P.Krmpotić, FranciscoFísicaParticle physicsLambda baryonPhysicsCarbon-12Quantum nonlocalityRadioactive decayLambdaThree-body problemAsymmetryComputationWe give general expressions for the vector asymmetry in the angular distribution of protons in the nonmesonic weak decay of polarized hypernuclei. From these we derive an explicit expression for the calculation of the asymmetry parameter, a<sub>Λ</sub>, which is applicable to the specific cases of ⁵<sub>Λ</sub>He and ¹²<sub>Λ</sub>C described within the extreme shell model. In contrast to the approximate formula widely used in the literature, it includes the effects of three-body kinematics in the final states of the decay and correctly treats the contribution of transitions originating from single-proton states beyond the s-shell. This expression is then used for the corresponding numerical computation of a<sub>Λ</sub> within several one-meson-exchange models. Besides the strictly local approximation usually adopted for the transition potential, we also consider the addition of the first-order nonlocality terms. We find values for a<sub>Λ</sub> ranging from -0.62 to -0.24, in qualitative agreement with other theoretical estimates but in contradiction with some recent experimental determinations.Facultad de Ciencias Exactas2005-09-28info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/126153enginfo:eu-repo/semantics/altIdentifier/issn/0556-2813info:eu-repo/semantics/altIdentifier/issn/1089-490Xinfo:eu-repo/semantics/altIdentifier/arxiv/nucl-th/0503037info:eu-repo/semantics/altIdentifier/doi/10.1103/physrevc.72.035210info: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:UNLP2025-09-29T11:30:17Zoai:sedici.unlp.edu.ar:10915/126153Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:30:18.147SEDICI (UNLP) - Universidad Nacional de La Platafalse |
| dc.title.none.fl_str_mv |
Asymmetry parameter for nonmesonic hypernuclear decay |
| title |
Asymmetry parameter for nonmesonic hypernuclear decay |
| spellingShingle |
Asymmetry parameter for nonmesonic hypernuclear decay Barbero, César Alberto Física Particle physics Lambda baryon Physics Carbon-12 Quantum nonlocality Radioactive decay Lambda Three-body problem Asymmetry Computation |
| title_short |
Asymmetry parameter for nonmesonic hypernuclear decay |
| title_full |
Asymmetry parameter for nonmesonic hypernuclear decay |
| title_fullStr |
Asymmetry parameter for nonmesonic hypernuclear decay |
| title_full_unstemmed |
Asymmetry parameter for nonmesonic hypernuclear decay |
| title_sort |
Asymmetry parameter for nonmesonic hypernuclear decay |
| dc.creator.none.fl_str_mv |
Barbero, César Alberto Galeao, A. P. Krmpotić, Francisco |
| author |
Barbero, César Alberto |
| author_facet |
Barbero, César Alberto Galeao, A. P. Krmpotić, Francisco |
| author_role |
author |
| author2 |
Galeao, A. P. Krmpotić, Francisco |
| author2_role |
author author |
| dc.subject.none.fl_str_mv |
Física Particle physics Lambda baryon Physics Carbon-12 Quantum nonlocality Radioactive decay Lambda Three-body problem Asymmetry Computation |
| topic |
Física Particle physics Lambda baryon Physics Carbon-12 Quantum nonlocality Radioactive decay Lambda Three-body problem Asymmetry Computation |
| dc.description.none.fl_txt_mv |
We give general expressions for the vector asymmetry in the angular distribution of protons in the nonmesonic weak decay of polarized hypernuclei. From these we derive an explicit expression for the calculation of the asymmetry parameter, a<sub>Λ</sub>, which is applicable to the specific cases of ⁵<sub>Λ</sub>He and ¹²<sub>Λ</sub>C described within the extreme shell model. In contrast to the approximate formula widely used in the literature, it includes the effects of three-body kinematics in the final states of the decay and correctly treats the contribution of transitions originating from single-proton states beyond the s-shell. This expression is then used for the corresponding numerical computation of a<sub>Λ</sub> within several one-meson-exchange models. Besides the strictly local approximation usually adopted for the transition potential, we also consider the addition of the first-order nonlocality terms. We find values for a<sub>Λ</sub> ranging from -0.62 to -0.24, in qualitative agreement with other theoretical estimates but in contradiction with some recent experimental determinations. Facultad de Ciencias Exactas |
| description |
We give general expressions for the vector asymmetry in the angular distribution of protons in the nonmesonic weak decay of polarized hypernuclei. From these we derive an explicit expression for the calculation of the asymmetry parameter, a<sub>Λ</sub>, which is applicable to the specific cases of ⁵<sub>Λ</sub>He and ¹²<sub>Λ</sub>C described within the extreme shell model. In contrast to the approximate formula widely used in the literature, it includes the effects of three-body kinematics in the final states of the decay and correctly treats the contribution of transitions originating from single-proton states beyond the s-shell. This expression is then used for the corresponding numerical computation of a<sub>Λ</sub> within several one-meson-exchange models. Besides the strictly local approximation usually adopted for the transition potential, we also consider the addition of the first-order nonlocality terms. We find values for a<sub>Λ</sub> ranging from -0.62 to -0.24, in qualitative agreement with other theoretical estimates but in contradiction with some recent experimental determinations. |
| publishDate |
2005 |
| dc.date.none.fl_str_mv |
2005-09-28 |
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info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
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article |
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publishedVersion |
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http://sedici.unlp.edu.ar/handle/10915/126153 |
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eng |
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eng |
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openAccess |
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