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dc.contributor.authorBarbero, C.
dc.contributor.authorGaleao, A. P.
dc.contributor.authorKrmpotic, F.
dc.date.accessioned2014-05-20T15:22:51Z
dc.date.available2014-05-20T15:22:51Z
dc.date.issued2005-09-01
dc.identifierhttp://dx.doi.org/10.1103/PhysRevC.72.035210
dc.identifier.citationPhysical Review C. College Pk: American Physical Soc, v. 72, n. 3, 11 p., 2005.
dc.identifier.issn0556-2813
dc.identifier.urihttp://hdl.handle.net/11449/33762
dc.description.abstractWe 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(Lambda), which is applicable to the specific cases of He-5(Lambda) and C-12(Lambda) 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(Lambda) 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(Lambda) ranging from -0.62 to -0.24, in qualitative agreement with other theoretical estimates but in contradiction with some recent experimental determinations.en
dc.format.extent11
dc.language.isoeng
dc.publisherAmerican Physical Soc
dc.relation.ispartofPhysical Review C
dc.sourceWeb of Science
dc.titleAsymmetry parameter for nonmesonic hypernuclear decayen
dc.typeArtigo
dcterms.licensehttp://publish.aps.org/authors/transfer-of-copyright-agreement
dcterms.rightsHolderAmerican Physical Soc
dc.contributor.institutionUniv Nacl La Plata
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionConsejo Nacl Invest Cient & Tecn
dc.description.affiliationUniv Nacl La Plata, Fac Ciências Exactas, Dept Fis, RA-1900 La Plata, Argentina
dc.description.affiliationUniv Estadual Paulista, Inst Fis Theor, BR-01405900 São Paulo, SP, Brazil
dc.description.affiliationUniv São Paulo, Inst Fis, BR-05315970 São Paulo, SP, Brazil
dc.description.affiliationConsejo Nacl Invest Cient & Tecn, Inst Fis La Plata, RA-1900 La Plata, Argentina
dc.description.affiliationUniv Nacl La Plata, Fac Ciências Astron & Geofis, RA-1900 La Plata, Argentina
dc.description.affiliationUnespUniv Estadual Paulista, Inst Fis Theor, BR-01405900 São Paulo, SP, Brazil
dc.identifier.doi10.1103/PhysRevC.72.035210
dc.identifier.wosWOS:000232229900060
dc.rights.accessRightsAcesso restrito
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Física Teórica (IFT), São Paulopt
dc.identifier.fileWOS000232229900060.pdf
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