Experimental investigation of the reaction12C(?, ?0)X in the photon energy range between threshold and 450 MeV

Arends, J.; Floss, N.; Hegerath, A.; Mecking, B. A.; Nöldeke, Georg; Stenz, R.

doi:10.1007/bf01415693

Cited by 44 publications

(6 citation statements)

References 14 publications

(16 reference statements)

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“…The coherent cross section involves the square of the product of the mass number and the nuclear form factor times the square of the spinisospin averaged amplitude. The coherent and incoherent cross sections can in principle be separated experimentally, as done in the case of pions around the delta energy region [33]. However, this might be difficult at higher energies where one usually has a poorer energy resolution.…”

Section: Resultsmentioning

confidence: 99%

Mass dependence of inclusive nuclear φ photoproduction

et al. 2004

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Based on a prior determination of the φ selfenergy in a nuclear medium we perform a theoretical study of inclusive φ photoproduction in nuclei, looking at the A dependence of the cross sections for different φ momenta. We find sizeable reductions in the nuclear cross sections with respect to the elementary one, using a φ selfenergy which implies a width about six times the free one at normal nuclear density. The calculations are done to match the set up for an ongoing experiment at SPring8/Osaka which should provide valuable information on the renormalization of the φ properties in nuclei.

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Section: Resultsmentioning

confidence: 99%

Mass dependence of inclusive nuclear φ photoproduction

et al. 2004

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“…For further comparison with experimental data we have calculated the coherent cross section from 12 C at photon energies of E γ = 235, 250, and 291 MeV. In Table I we have collated our calculations with experimental data published by J. Arends and collaborators [18] for E γ = 235 and 291 MeV, and with data presented by Booth [19] and A. Nagl, V. Devanathan, and H. Überall [14] for E γlab = 250 MeV. The experimental data exhibits similar patterns as our calculations (not shown) but the values of the maxima of the cross section are different.…”

Section: B Resultsmentioning

confidence: 99%

Lessons to be learned from the coherent photoproduction of pseudoscalar mesons

et al. 1999

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We study the coherent photoproduction of pseudoscalar mesons-particularly of neutral pions-placing special emphasis on the various sources that put into question earlier nonrelativistic-impulse-approximation calculations. These include: final-state interactions, relativistic effects, off-shell ambiguities, and violations to the impulse approximation. We establish that, while distortions play an essential role in the modification of the coherent cross section, the uncertainty in our results due to the various choices of optical-potential models is relatively small (of at most 30%). By far the largest uncertainty emerges from the ambiguity in extending the many on-shell-equivalent representations of the elementary amplitude off the mass shell. Indeed, relativistic impulseapproximation calculations that include the same pionic distortions, the same nuclear-structure model, and two sets of elementary amplitudes that are identical on-shell, lead to variations in the magnitude of the coherent cross section by up to factors of five. Finally, we address qualitatively the assumption of locality implicit in most impulse-approximation treatments, and suggest that the coherent reaction probes-in addition to the nuclear density-the polarization structure of the nucleus. PACS number(s): 14.40.Aq,24.10.Jv Typeset using REVT E X

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“…The curves are calculations from [21]. The triangles for 12 C are from a previous measurement with less stringent suppression of the incoherent components [22].…”

Section: The ∆(1232) Resonancementioning

confidence: 99%

Photoproduction of mesons from nuclei —in-medium properties of hadrons

Krusche

2005

Progress in Particle and Nuclear Physics

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Recent experimental results for the in-medium properties of hadrons obtained with photoproduction of mesons from nuclei are discussed. The experiments were done with the TAPS detector at the tagged photon beam of the MAMI accelerator in Mainz. Measured were the final states π o X, ηX, 2π o X, and π o π ± X for 12 C, 40 Ca, 93 Nb, and 208 Pb up to the second resonance region. The results were used for an investigation of the in-medium properties of the P 33 (1232), the P 11 (1440), the D 13 (1520), and the S 11 (1535) resonances. It was found that the cross sections can be spilt into a component which originates from the low density surface region of the nuclei and a component which scales like the nuclear volume. The energy dependence of the surface component is strikingly similar to the deuteron, it shows a clear signal for the second resonance peak. The volume component is lacking this peak and shows an enhancement at intermediate energies. Furthermore the measurement of coherent η-photoproduction and the final state pπ o from 3 He is discussed in the context of the search for η-mesic nuclei.

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Experimental investigation of the reaction12C(?, ?0)X in the photon energy range between threshold and 450 MeV

Cited by 44 publications

References 14 publications

Mass dependence of inclusive nuclear φ photoproduction

Mass dependence of inclusive nuclear φ photoproduction

Lessons to be learned from the coherent photoproduction of pseudoscalar mesons

Photoproduction of mesons from nuclei —in-medium properties of hadrons

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