Photoproduction of πmesons from nuclei

Krusche, B.; Lehr, J.M.; Ahrens, J.; Annand, J. R. M.; Beck, R.; Bloch, F.; Fog, L. S.; Hornidge, D.; Janssen, Stijn; Kotulla, M.; McGeorge, J. C.; MacGregor, I. J. D.; Messchendorp, J. G.; Metag, V.; Mosel, U.; Novotny, R.; Owens, R.O.; Pfeiffer, M.; Sanderson, Ruth; Schadmand, S.; Watts, D. P.

doi:10.1140/epja/i2004-10033-9

Cited by 66 publications

(98 citation statements)

References 46 publications

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“…In this work, we have reproduced quite successfully recent data from the Mainz Microton collaboration (MAMI) for the differential cross sections for incoherent π 0 photoproduction at the (1232) resonance energy region, for both 12 C and 208 Pb [8]. Also we have calculated the angular distributions of neutral pions at higher energies, typically 4.0 to 6.0 GeV, and extreme forward angles (θ lab π 4 • ) to estimate the nuclear background in the high-precision particle-production experiment carried out by the PrimEx Collaboration [9] at the Jefferson Laboratory.…”

Section: Introductionsupporting

confidence: 58%

Photon-induced multiple particle emissions ofZr90andnatZr from 10 to 140 MeV

et al. 2007

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A comprehensive analysis of electrodisintegration yields of protons on 90 Zr is proposed taking into account the giant dipole resonance, isovector giant quadrupole resonance (IVGQR), and quasideuteron contributions to the total photoabsorption cross section from 10 to 140 MeV. The calculation applies the MCMC intranuclear cascade to address the direct and pre-equilibrium emissions and another Monte Carlo-based algorithm to describe the evaporation step. The final results of the total photoabsorption cross section for 90 Zr and relevant decay channels are obtained by fitting the (e, p) measurements from the National Bureau of Standards and show that multiple proton emissions dominate the photonuclear reactions at higher energies. These results provide a consistent explanation for the exotic and steady increase of the (e, p) yield and also a strong evidence of a IVGQR with a strength parameter compatible with the E2 energy-weighted sum rule. The inclusive photoneutron cross sections for 90 Zr and nat Zr, derived from these results and normalized with the (e, p) data, are in agreement within 10% with both Livermore and Saclay data up to 140 MeV.

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Section: Introductionsupporting

confidence: 58%

Photon-induced multiple particle emissions ofZr90andnatZr from 10 to 140 MeV

et al. 2007

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“…For instance, the cross section for incoherent η photoproduction up to ∼1 GeV is dominated by the S 11 (1535) resonance excitation due to its large branching ratio decay into the Nη channel. Similarly, for the case of incoherent π 0 photoproduction most of the theoretical predictions have been provided up to ∼1 GeV, following the general tendency of recent experiments performed at the Mainz Microtron Facility [5,6]. The meson-nucleus FSI have been taken into account using optical potentials [7], classical propagation between meson-nucleon collisions [8], the quantum molecular dynamics (QMD) model of Ref.…”

Section: Introductionmentioning

confidence: 99%

“…The photoproduction mechanism is described via a two-step process: (i) meson photoproduction from a single nucleon (IA) and (ii) meson-nucleus FSI via a cascade approach. An earlier version of the MCMC model [27] has been successfully applied for the interpretation of recent data of incoherent π 0 photoproduction from MAMI [5]. Another version [28] also investigated coherent π 0 photoproduction (electromagnetic/nuclear) including the nuclear recoil.…”

Section: Introductionmentioning

confidence: 99%

Nuclear incoherent photoproduction ofπ0andηfrom 4 to 12 GeV

Rodrigues¹,

Arruda‐Neto²,

Mesa³

et al. 2010

Phys. Rev. C

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The mechanism of incoherent π 0 and η 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 π 0 photoproduction reproduced for the first time the magnitude and energy dependence of the measured rations σ γ A /σ γ N for several nuclei (Be, C, Al, Cu, Ag, and Pb) from a Cornell experiment. The results for η 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 η → γ γ decay width was extracted using the Primakoff method, combining Be and Cu data [ η→γ γ = 0.476 (62)

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“…The absorption properties for these mesons are quite different. Pions are strongly absorbed when their kinetic energy is high enough (> 100 MeV) to excite the ∆(1232) resonance, but nuclei are transparent for low-energy pions [150]. The pion -nucleon interaction is weak at low momenta so that pions cannot be bound in nuclei (though negative pions can be bound with the help of the Coulomb force [156]).…”

Section: Inclusive Productionmentioning

confidence: 99%

Production of η and η′ mesons on nucleons and nuclei

Krusche¹,

Wilkin²

2015

Progress in Particle and Nuclear Physics

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The production of η and η mesons in photon-and hadron-induced reactions on free and quasifree nucleons and on nuclei is reviewed. The extensive database on γN → ηN , for both proton and neutron targets, is described in detail and its implications for the search for N resonances much heavier than the dominant S 11 (1535) discussed. Though less is currently known about the production of the η or of ηπ pairs, these also offer tantalizing prospects in the search for the missing isobars. The more limited data available on pion-induced production are still necessary ingredients in the partial wave analysis discussed.The production of the η-meson in pp and pn collisions shows once again the strong influence of the S 11 (1535) isobar, which is in contrast to the relatively weak behaviour seen near threshold for η production. This difference is reflected in the important final state interaction effects of the η in nuclei that may even lead to this meson being "bound" in some systems. The evidence for this is reviewed for both γA and pA collisions. The inclusive photoproduction of η, η , and ηπ pairs from nuclei provides further information regarding the production mechanism and the interaction of the η and η with nuclei and the ηπ pairs may even allow access to low mass ηA systems that are forbidden in direct single-meson photoproduction.

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Photoproduction of πmesons from nuclei

Cited by 66 publications

References 46 publications

Photon-induced multiple particle emissions ofZr90andnatZr from 10 to 140 MeV

Photon-induced multiple particle emissions ofZr90andnatZr from 10 to 140 MeV

Nuclear incoherent photoproduction ofπ0andηfrom 4 to 12 GeV

Production of η and η′ mesons on nucleons and nuclei

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