Asymmetry parameter for nonmesonic hypernuclear decay

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 specifi...

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Autores principales: Barbero, César Alberto, Galeao, A. P., Krmpotić, Francisco
Formato: Articulo
Lenguaje:Inglés
Publicado: 2005
Materias:
Física
Particle physics
Lambda baryon
Physics
Carbon-12
Quantum nonlocality
Radioactive decay
Lambda
Three-body problem
Asymmetry
Computation
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/126153
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-126153
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Particle physics
Lambda baryon
Physics
Carbon-12
Quantum nonlocality
Radioactive decay
Lambda
Three-body problem
Asymmetry
Computation
spellingShingle Física
Particle physics
Lambda baryon
Physics
Carbon-12
Quantum nonlocality
Radioactive decay
Lambda
Three-body problem
Asymmetry
Computation
Barbero, César Alberto
Galeao, A. P.
Krmpotić, Francisco
Asymmetry parameter for nonmesonic hypernuclear decay
topic_facet Física
Particle physics
Lambda baryon
Physics
Carbon-12
Quantum nonlocality
Radioactive decay
Lambda
Three-body problem
Asymmetry
Computation
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.
format Articulo
Articulo
author Barbero, César Alberto
Galeao, A. P.
Krmpotić, Francisco
author_facet Barbero, César Alberto
Galeao, A. P.
Krmpotić, Francisco
author_sort Barbero, César Alberto
title Asymmetry parameter for nonmesonic hypernuclear decay
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
publishDate 2005
url http://sedici.unlp.edu.ar/handle/10915/126153
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AT galeaoap asymmetryparameterfornonmesonichypernucleardecay
AT krmpoticfrancisco asymmetryparameterfornonmesonichypernucleardecay
bdutipo_str Repositorios
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