Simple analytical expression for vector hypernuclear asymmetry in nonmesonic decay ¿5He and ¿12C
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| Format: | Artículo científico |
| Langue: | en |
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Sociedade Brasileira de Física
2006
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| _version_ | 1876485171777110016 |
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| author | César Barbero |
| author_facet | César Barbero |
| contents | Simple analytical expression for vector hypernuclear asymmetry in nonmesonic decay ¿5He and ¿12C César Barbero Francisco Krmpotic Alfredo P. Galeão Física, Astronomía y Matemáticas One meson exchange model Hypernuclear decay Asymmetry parameter We present general explicit expressions for a shell-model calculationof the vector hypernuclear parameter in nonmesonic weak decay. We use a widely accepted effective coupling Hamiltonian involving theexchange of the complete pseudoscalar and vector meson octets(<FONT FACE=Symbol>p, h</FONT>, K, <FONT FACE=Symbol>r, w</FONT>, K*). In contrast to the approximated formula widely used in the literature,we correctly treat the contribution of transitions originated fromsingle-proton states beyond the s-shell. Exact and simple analytical expressions are obtained for the particularcases of $^5_Lambda$He and $^{12}_\Lambda$C, within theone-pion-exchange model. Numerical computations of the asymmetry parameter, $a_\Lambda$, are presented. Our results show a qualitative agreementwith other theoretical estimates but also acontradiction with recent experimental determinations. Our simple analytical formulas provide a guide in searchingthe origin of such discrepancies, andthey will be useful for helping to solve the hypernuclearweak decay puzzle. 2006 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46413543005 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.4b Vol.36 |
| format | Artículo científico |
| id | redalyc_46413543005 |
| institution | Redalyc |
| language | en |
| publishDate | 2006 |
| publisher | Sociedade Brasileira de Física |
| spellingShingle | Simple analytical expression for vector hypernuclear asymmetry in nonmesonic decay ¿5He and ¿12C César Barbero Física, Astronomía y Matemáticas One meson exchange model Hypernuclear decay Asymmetry parameter Simple analytical expression for vector hypernuclear asymmetry in nonmesonic decay ¿5He and ¿12C César Barbero Francisco Krmpotic Alfredo P. Galeão Física, Astronomía y Matemáticas One meson exchange model Hypernuclear decay Asymmetry parameter We present general explicit expressions for a shell-model calculationof the vector hypernuclear parameter in nonmesonic weak decay. We use a widely accepted effective coupling Hamiltonian involving theexchange of the complete pseudoscalar and vector meson octets(<FONT FACE=Symbol>p, h</FONT>, K, <FONT FACE=Symbol>r, w</FONT>, K*). In contrast to the approximated formula widely used in the literature,we correctly treat the contribution of transitions originated fromsingle-proton states beyond the s-shell. Exact and simple analytical expressions are obtained for the particularcases of $^5_Lambda$He and $^{12}_\Lambda$C, within theone-pion-exchange model. Numerical computations of the asymmetry parameter, $a_\Lambda$, are presented. Our results show a qualitative agreementwith other theoretical estimates but also acontradiction with recent experimental determinations. Our simple analytical formulas provide a guide in searchingthe origin of such discrepancies, andthey will be useful for helping to solve the hypernuclearweak decay puzzle. 2006 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46413543005 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.4b Vol.36 |
| title | Simple analytical expression for vector hypernuclear asymmetry in nonmesonic decay ¿5He and ¿12C |
| topic | Física, Astronomía y Matemáticas One meson exchange model Hypernuclear decay Asymmetry parameter |
| url | https://www.redalyc.org/articulo.oa?id=46413543005 |