Intrinsic asymmetry parameter in nonmesonic hypernuclear decay: analytical proof of the independence on hypernucleus within an independent particle shell model
We derive general analytical expressions for the evaluation of the intrinsic asymmetry parameter in nonmesonic hypernuclear weak decay, within an independent particle shell model framework. Present formalism is valid for even-even, even-odd and odd-odd core hypernucleus. A standard strangeness-chang...
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| Autores principales: | , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
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2009
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/123844 |
| Aporte de: |
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I19-R120-10915-123844 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
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SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Exactas Física Hypernuclear decay Asymmetry parameter One-meson-exchange Independent particle shell model |
| spellingShingle |
Ciencias Exactas Física Hypernuclear decay Asymmetry parameter One-meson-exchange Independent particle shell model Barbero, César Alberto Mariano, Alejandro Edgardo Intrinsic asymmetry parameter in nonmesonic hypernuclear decay: analytical proof of the independence on hypernucleus within an independent particle shell model |
| topic_facet |
Ciencias Exactas Física Hypernuclear decay Asymmetry parameter One-meson-exchange Independent particle shell model |
| description |
We derive general analytical expressions for the evaluation of the intrinsic asymmetry parameter in nonmesonic hypernuclear weak decay, within an independent particle shell model framework. Present formalism is valid for even-even, even-odd and odd-odd core hypernucleus. A standard strangeness-changing weak transition potential with exchange of the complete meson octet (π, η, K, ρ, ω, K*) is assumed. Very simple analytical formulas are obtained within the s-wave approximation when we restrict to the π and π+K exchange models, providing an useful and manageable tool to understand the origin of the discrepancies between theoretical and experimental results. Numerical values for ⁴<sub>Λ</sub>He, ⁵<sub>Λ</sub>He, ¹¹<sub>Λ</sub>B, ¹²<sub>Λ</sub>C, ¹⁶<sub>Λ</sub>O, ¹⁷<sub>Λ</sub>O and ²⁸<sub>Λ</sub>Si hypernuclei are exhibited. Present formalism could be used to understand why new contributions to the exchange potential allow to obtain good agreement with data, as indicated in very recent works. The necessity of a consistent inclusion of: i) different modifications of the exchange potential (two-pion exchange, a₁ meson, ΔT = 3/2 terms coming from vector mesons, etc); ii) final state interactions on primary nucleons inside the residual nucleus and also correlations between the free emitted ones; and iii) configuration mixing in the final system, is remarked. |
| format |
Articulo Articulo |
| author |
Barbero, César Alberto Mariano, Alejandro Edgardo |
| author_facet |
Barbero, César Alberto Mariano, Alejandro Edgardo |
| author_sort |
Barbero, César Alberto |
| title |
Intrinsic asymmetry parameter in nonmesonic hypernuclear decay: analytical proof of the independence on hypernucleus within an independent particle shell model |
| title_short |
Intrinsic asymmetry parameter in nonmesonic hypernuclear decay: analytical proof of the independence on hypernucleus within an independent particle shell model |
| title_full |
Intrinsic asymmetry parameter in nonmesonic hypernuclear decay: analytical proof of the independence on hypernucleus within an independent particle shell model |
| title_fullStr |
Intrinsic asymmetry parameter in nonmesonic hypernuclear decay: analytical proof of the independence on hypernucleus within an independent particle shell model |
| title_full_unstemmed |
Intrinsic asymmetry parameter in nonmesonic hypernuclear decay: analytical proof of the independence on hypernucleus within an independent particle shell model |
| title_sort |
intrinsic asymmetry parameter in nonmesonic hypernuclear decay: analytical proof of the independence on hypernucleus within an independent particle shell model |
| publishDate |
2009 |
| url |
http://sedici.unlp.edu.ar/handle/10915/123844 |
| work_keys_str_mv |
AT barberocesaralberto intrinsicasymmetryparameterinnonmesonichypernucleardecayanalyticalproofoftheindependenceonhypernucleuswithinanindependentparticleshellmodel AT marianoalejandroedgardo intrinsicasymmetryparameterinnonmesonichypernucleardecayanalyticalproofoftheindependenceonhypernucleuswithinanindependentparticleshellmodel |
| bdutipo_str |
Repositorios |
| _version_ |
1764820450337095681 |