Absolute measurement of the total photoabsorption cross section for carbon in the nucleon resonance region

Bianchi, N.; Muccifora, V.; Deppman, A.; Sanctis, E. De; Fantoni, A.; Sandri, P. Levi; Lucherini, V.; Mirazita, M.; Polli, E.; Reolon, A. R.; Rossi, P.; Anghinolfi, M.; Corvisiero, P.; Gervino, G.; Mazzaschi, L.; Mokeev, V.; Ricco, G.; Ripani, M.; Sanzone, M.; Taiuti, M.; Zucchiatti, A.

doi:10.1016/0370-2693(93)91494-8

Cited by 45 publications

(18 citation statements)

References 18 publications

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“…The data on the total photoabsorption cross section on heavy nuclei [7] give an evidence for a broadening of nucleon resonances in nuclear medium [8]. The physics behind this effect is the same as in the collision broadening of the atomic spectral lines in hot and dense gases, discussed by Weisskopf [9] in the early 1930s.…”

Section: Introductionmentioning

confidence: 91%

Electromagnetic Transition Form Factors and Dilepton Decay Rates of Nucleon Resonances

et al. 2002

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Relativistic, kinematically complete phenomenological expressions for the dilepton decay rates of nucleon resonances with arbitrary spin and parity are derived in terms of the magnetic, electric, and Coulomb transition form factors. The dilepton decay rates of the nucleon resonances with masses below 2 GeV are estimated using the extended vector meson dominance (VMD) model for the transition form factors. The model provides a unified description of the photo-and electroproduction data, γ (γ * )N → N * , the vector meson decays, N * → N ϕ (ω), and the dilepton decays, N * → N + − . The constraints on the transition form factors from the quark counting rules are taken into account. The parameters of the model are fixed by fitting the available photo-and electroproduction data and using results of the multichannel partial-wave analysis of the π N scattering. Where experimental data are not available, predictions of the non-relativistic quark models are used as an input. The vector meson coupling constants of the magnetic, electric, and Coulomb types are determined. The dilepton widths and the dilepton spectra from decays of nucleon resonances with masses below 2 GeV are calculated. C 2002 Elsevier Science (USA)

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Section: Introductionmentioning

confidence: 91%

Electromagnetic Transition Form Factors and Dilepton Decay Rates of Nucleon Resonances

et al. 2002

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“…[43,44]). The argument here is that the resonance structure (above the ∆-peak) is not seen experimentally even in photoabsorption on light nuclei [45]. In contrast to the resonance concept -adopted in UrQMD for all low energy baryon-baryon and meson-baryon collisions -HSD includes the direct (non-resonant) meson production in order to describe the corresponding cross sections (for the details see Ref.…”

Section: Transport Models -Urqmd and Hsdmentioning

confidence: 99%

Hadronic observables at relativistic energies: Anything strange with strangeness?

et al. 2003

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We calculate p, π ± , K ± and Λ(+Σ 0 ) rapidity distributions and compare to experimental data from SIS to SPS energies within the UrQMD and HSD transport approaches that are both based on string, quark, diquark (q,q, qq,qq) and hadronic degrees of freedom. The two transport models do not include any explicit phase transition to a quark-gluon plasma (QGP).It is found that both approaches agree rather well with each other and with the experimental rapidity distributions for protons, Λ's, π ± and K ± . Inspite of this apparent agreement both transport models fail to reproduce the maximum in the excitation function for the ratio K + /π + found experimentally between 11 and 40 A·GeV. A comparison to the various experimental data shows that this 'failure' is dominantly due to an insufficient descrip- * Supported by DFG 1 tion of pion rapidity distributions rather than missing 'strangeness'. The modest differences in the transport model results -on the other hand -can be attributed to different implementations of string formation and fragmentation, that are not sufficiently controlled by experimental data for the 'elementary' reactions in vacuum.

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“…First experiments using a tagged high-energy photon beam (E γ = 0.3-2.6 GeV), which offered sufficient energy to excite the second resonance region, have been performed by the Yerevan group [294,295]. Following up this pioneering work, photon absorption on nuclei has been measured at the Mainz Microton (MAMI) facility [296,297] with a beam energy of E γ = 0.05-0.8 GeV, with higher energies of E γ = 0.2-1.2 GeV at the Adone storage ring facility (Frascati, Italy) [298,299,300,301,302], using the SAPHIR tagged photon beam of E γ = 0.5-2.67 GeV at ELSA (Bonn, Germany) [303] and at Hall B of the Jefferson Laboratory (Newport News, USA) [304,305] with a beam energy of E γ = 0.17-3.84 GeV. In fact, some of the above experiments have not measured directly the photoabsorption cross section but only the photofission cross section [296,297,300,298,304,305].…”

Section: Total Photoabsorption Cross Sectionmentioning

confidence: 99%

Transport-theoretical description of nuclear reactions

et al. 2012

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In this review we first outline the basics of transport theory and its recent generalization to offshell transport. We then present in some detail the main ingredients of any transport method using in particular the Giessen Boltzmann-Uehling-Uhlenbeck (GiBUU) implementation of this theory as an example. We discuss the potentials used, the ground state initialization and the collision term, including the in-medium modifications of the latter. The central part of this review covers applications of GiBUU to a wide class of reactions, starting from pion-induced reactions over proton and antiproton reactions on nuclei to heavy-ion collisions (up to about 30 AGeV). A major part concerns also the description of photon-, electron-and neutrino-induced reactions (in the energy range from a few 100 MeV to a few 100 GeV). For this wide class of reactions GiBUU gives an excellent description with the same physics input and the same code being used. We argue that GiBUU is an indispensable tool for any investigation of nuclear reactions in which final-state interactions play a role. Studies of pion-nucleus interactions, nuclear fragmentation, heavy-ion reactions, hypernucleus formation, hadronization, color transparency, electronnucleus collisions and neutrino-nucleus interactions are all possible applications of GiBUU and are discussed in this article.

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Absolute measurement of the total photoabsorption cross section for carbon in the nucleon resonance region

Cited by 45 publications

References 18 publications

Electromagnetic Transition Form Factors and Dilepton Decay Rates of Nucleon Resonances

Electromagnetic Transition Form Factors and Dilepton Decay Rates of Nucleon Resonances

Hadronic observables at relativistic energies: Anything strange with strangeness?

Transport-theoretical description of nuclear reactions

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