Absorptionsschalldämpfer

Frommhold, Werner

doi:10.1007/3-540-33017-8_9

Cited by 11 publications

(6 citation statements)

References 4 publications

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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%

“…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]. Contrary to earlier assumptions, it has been shown by Cetina et al [304,305] that these two cross sections need not be identical.…”

Section: Total Photoabsorption Cross Sectionmentioning

confidence: 99%

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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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Section: Total Photoabsorption Cross Sectionmentioning

confidence: 99%

Section: Total Photoabsorption Cross Sectionmentioning

confidence: 99%

Transport-theoretical description of nuclear reactions

et al. 2012

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“…An analysis of pionand photo-induced reactions has established the need to introduce a spreading potential for the P 33 (1232), yielding a moderate broadening of about 80 MeV for this state [8]. The disappearance of the second resonance region in photoabsorption reactions on the nucleus as observed in [9,10,11] has been interpreted in terms of a broadening of the D 13 (1520) in nuclear matter [12]. Finally, data of η photoproduction on nuclei [13,14] have opened up the possibility to study the in-medium properties of the S 11 (1535).…”

Section: Introductionmentioning

confidence: 99%

Hadronic spectral functions in nuclear matter

2004

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We study the in-medium properties of mesons (π, η, ρ) and baryon resonances in cold nuclear matter within a coupled-channel analysis. The meson self energies are generated by particle-hole excitations. Thus multi-peak spectra are obtained for the mesonic spectral functions. In turn this leads to medium-modifications of the baryon resonances. Special care is taken to respect the analyticity of the spectral functions and to take into account effects from short-range correlations both for positive and negative parity states. Our model produces sensible results for pion and ∆ dynamics in nuclear matter. We find a strong interplay of the ρ meson and the D 13 (1520), which moves spectral strength of the ρ spectrum to smaller invariant masses and leads to a broadening of the baryon resonance. The optical potential for the η meson resulting from our model is rather attractive whereas the in-medium properties modifications of the S 11 (1535) are found to be quite small.

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“…The nuclear cross sections are practically identical when scaled by the atomic mass number, thus scaling expectedly with the nuclear volume. However, the measurements indicate a depletion of the resonance structure in the second resonance region [ 12,13,14]. Bianchi et al [ 14] reported that, while in the ∆-resonance region strength is only redistributed by broadening effects, strength is missing in the D 13 (1520) region.…”

Section: Nuclear Photoabsoprtionmentioning

confidence: 97%

Double-pion photoproduction from nuclei

Schadmand

2006

Acta Physica Hungarica A

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Differences in the photoproduction of mesons on the free proton and on nuclei are expected to reveal changes in the properties of hadrons. Inclusive studies of nuclear photoabsorption have provided evidence of medium modifications. However, the results have not been explained in a model independent way. A deeper understanding of the situation is anticipated from a detailed experimental study of meson photoproduction from nuclei in exclusive reactions. In the energy regime above the ∆(1232) resonance, the dominant double pion production channels are of particular interest. Double pion photoproduction from nuclei is also used to investigate the in-medium modification of meson-meson interactions.

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Absorptionsschalldämpfer

Cited by 11 publications

References 4 publications

Transport-theoretical description of nuclear reactions

Transport-theoretical description of nuclear reactions

Hadronic spectral functions in nuclear matter

Double-pion photoproduction from nuclei

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