On the effect of the Δ(1232) in hypernuclear non-mesonic weak decay: a microscopic approach

The non-mesonic weak decay of Λ-hypernuclei is studied within a microscopic diagrammatic approach which includes, for the first time, the effect or the δ-baryon resonance. We adopt a nuclear matter formalism extended to finite nuclei via the local density approximation, a one-meson exchange weak tra...

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Detalles Bibliográficos
Autores principales: Bauer, Eduardo, Garbarino, G.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2012
Materias:
Física
Λ-hypernuclei
FSI
Non-mesonic weak decay
Two-nucleon induced decay
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84692
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84692
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Λ-hypernuclei
FSI
Non-mesonic weak decay
Two-nucleon induced decay
spellingShingle Física
Λ-hypernuclei
FSI
Non-mesonic weak decay
Two-nucleon induced decay
Bauer, Eduardo
Garbarino, G.
On the effect of the Δ(1232) in hypernuclear non-mesonic weak decay: a microscopic approach
topic_facet Física
Λ-hypernuclei
FSI
Non-mesonic weak decay
Two-nucleon induced decay
description The non-mesonic weak decay of Λ-hypernuclei is studied within a microscopic diagrammatic approach which includes, for the first time, the effect or the δ-baryon resonance. We adopt a nuclear matter formalism extended to finite nuclei via the local density approximation, a one-meson exchange weak transition potential, a Bonn nucleon-nucleon strong potential and a δ. N→ NN strong potential based on the Landau-Migdal theory. Ground state correlations and final state interactions (FSI), at second order in the baryon-baryon strong interaction, are introduced on the same footing for all the isospin channels of one- and two-nucleon induced decays. Weak decay rates and single and double-coincidence nucleon spectra are predicted for CΛ12 and compared with recent KEK and FINUDA data. The δ(1232) introduces new FSI-induced decay mechanisms which lead to an improvement when comparing the obtained nucleon spectra with data, while it turns out to have a negligible effect on the decay rates. Discrepancies with experiment remain only for emission spectra involving protons, but are mostly restricted to double-nucleon correlations in the non-back-to-back kinematics.
format Articulo
Articulo
author Bauer, Eduardo
Garbarino, G.
author_facet Bauer, Eduardo
Garbarino, G.
author_sort Bauer, Eduardo
title On the effect of the Δ(1232) in hypernuclear non-mesonic weak decay: a microscopic approach
title_short On the effect of the Δ(1232) in hypernuclear non-mesonic weak decay: a microscopic approach
title_full On the effect of the Δ(1232) in hypernuclear non-mesonic weak decay: a microscopic approach
title_fullStr On the effect of the Δ(1232) in hypernuclear non-mesonic weak decay: a microscopic approach
title_full_unstemmed On the effect of the Δ(1232) in hypernuclear non-mesonic weak decay: a microscopic approach
title_sort on the effect of the δ(1232) in hypernuclear non-mesonic weak decay: a microscopic approach
publishDate 2012
url http://sedici.unlp.edu.ar/handle/10915/84692
work_keys_str_mv AT bauereduardo ontheeffectofthed1232inhypernuclearnonmesonicweakdecayamicroscopicapproach
AT garbarinog ontheeffectofthed1232inhypernuclearnonmesonicweakdecayamicroscopicapproach
bdutipo_str Repositorios
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