Nuclear incoherent photoproduction of pi(0) and eta from 4 to 12 GeV

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dc.contributor.authorRodrigues, T. E.
dc.contributor.authorArruda-Neto, J. D. T.
dc.contributor.authorMesa, J. [UNESP]
dc.contributor.authorGarcia, C.
dc.contributor.authorShtejer, K.
dc.contributor.authorDale, D.
dc.contributor.authorNakagawa, I.
dc.contributor.authorCole, P. L.
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionSão Paulo Engn Coll
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionCtr Appl Studies Nucl Dev CEADEN
dc.contributor.institutionIdaho State Univ
dc.contributor.institutionRIKEN
dc.date.accessioned2014-05-20T13:49:38Z
dc.date.available2014-05-20T13:49:38Z
dc.date.issued2010-08-20
dc.description.abstractThe mechanism of incoherent pi(0) and eta photoproduction from complex nuclei is investigated from 4 to 12 GeV with an extended version of the multicollisional Monte Carlo (MCMC) intranuclear cascade model. The calculations take into account the elementary photoproduction amplitudes via a Regge model and the nuclear effects of photon shadowing, Pauli blocking, and meson-nucleus final-state interactions. The results for pi(0) photoproduction reproduced for the first time the magnitude and energy dependence of the measured rations sigma(gamma A)/sigma(gamma N) for several nuclei (Be, C, Al, Cu, Ag, and Pb) from a Cornell experiment. The results for eta photoproduction fitted the inelastic background in Cornell's yields remarkably well, which is clearly not isotropic as previously considered in Cornell's analysis. With this constraint for the background, the eta -> gamma gamma. decay width was extracted using the Primakoff method, combining Be and Cu data [Gamma(eta ->gamma gamma) = 0.476(62) keV] and using Be data only [Gamma(eta ->gamma gamma) = 0.512(90) keV]; where the errors are only statistical. These results are in sharp contrast (similar to 50-60%) with the value reported by the Cornell group [Gamma(eta ->gamma gamma). = 0.324(46) keV] and in line with the Particle Data Group average of 0.510(26) keV.en
dc.description.affiliationUniv São Paulo, Inst Phys, BR-05315970 São Paulo, Brazil
dc.description.affiliationSão Paulo Engn Coll, FESP, São Paulo, Brazil
dc.description.affiliationUNESP, Dept Phys & Biophys, Botucatu, SP, Brazil
dc.description.affiliationCtr Appl Studies Nucl Dev CEADEN, Havana, Cuba
dc.description.affiliationIdaho State Univ, Dept Phys, Pocatello, ID 83209 USA
dc.description.affiliationRIKEN, Wako, Saitama 3510198, Japan
dc.description.affiliationUnespUNESP, Dept Phys & Biophys, Botucatu, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.format.extent24
dc.identifierhttp://dx.doi.org/10.1103/PhysRevC.82.024608
dc.identifier.citationPhysical Review C. College Pk: Amer Physical Soc, v. 82, n. 2, p. 24, 2010.
dc.identifier.doi10.1103/PhysRevC.82.024608
dc.identifier.fileWOS000281066200002.pdf
dc.identifier.issn0556-2813
dc.identifier.urihttp://hdl.handle.net/11449/17702
dc.identifier.wosWOS:000281066200002
dc.language.isoeng
dc.publisherAmer Physical Soc
dc.relation.ispartofPhysical Review C
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleNuclear incoherent photoproduction of pi(0) and eta from 4 to 12 GeVen
dc.typeArtigo
dcterms.licensehttp://publish.aps.org/authors/transfer-of-copyright-agreement
dcterms.rightsHolderAmer Physical Soc
unesp.author.orcid0000-0001-6519-5118[3]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Botucatupt

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Artigos - Física e Biofísica - IBB