The Production of Positive Mesons by Photons

Steinberger, J.; Bishop, A. S.

doi:10.1103/physrev.86.171

Cited by 47 publications

(21 citation statements)

References 18 publications

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“…To gauge the one-particle irreducible πN amplitude t (1) , we need to first gauge the πN propagator g. Since only two-body unitarity need be considered, the nucleon propagator in g can be taken to be the bare propagator S 0 , and the πN propagator reduces to g = S 0 ∆.…”

Section: Is the Gauge Invariant Amplitude Unitary?mentioning

confidence: 99%

Gauge invariant unitary theory for pion photoproduction

Antwerpen

Afnan

1995

Phys. Rev. C

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The Ward-Takahashi identities are central to the gauge invariance of the photoproduction amplitude. Here we demonstrate that unitarity and in particular the inclusion of both the πN and γπN thresholds on equal footing yields a photoproduction amplitude that satisfies both two-body unitarity and the generalized Ward-Takahashi identities. The final amplitude is a solution of a set of coupled channel integral equations for the reactions πN → πN and γN → πN .Typeset using REVT E X

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Section: Is the Gauge Invariant Amplitude Unitary?mentioning

confidence: 99%

Gauge invariant unitary theory for pion photoproduction

Antwerpen

Afnan

1995

Phys. Rev. C

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“…The main reason is the lack of a suitable source of monochromatic high energy photons. Most experiments on inelastic pion photoproduction have been performed with the continuous energy spectrum provided by electron bremsstrahlung [5]. In a few cases the bremsstrahlung difference technique has been used [6].…”

Section: Introductionmentioning

confidence: 99%

Inclusive charged pion photoproduction on12C using tagged photons in the energy range (200?390) MeV

et al. 1982

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The photoproduction of charged pions on 12 C has been investigated using the tagged photon beam facility at the Bonn 500 MeV synchrotron. Pions were detected in a broad range magnetic spectrometer. Double differential cross sections for pion emission at fixed photon energies are presented. The integration of the measured distributions yields the total cross section for inclusive pion production. The data are compared to the predictions of a simple model that takes the quasifree production of pions and their subsequent scattering and reabsorption into account.

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“…T h e only other materials in which the spectrum has been measured are carbon and hydrogen. The results for these elements are also given in figure 4 (c) for comparison (McMillan, Peterson andWhite 1949, Steinberger andBishop 1952). As the atomic number of the target material is increased, the energy spectruiii of the produced mesons appears to get narrower, and the energy at the maximum appears to move to lower values.…”

Section: The Energy Spectrum Of the Produced Mesonsmentioning

confidence: 90%

“…Further, one must increase the numerator by SO",', to allow for the effect of the neutral rr-mesons, which will of course contribute to star production, if reabsorbed, but will not leave visible meson tracks. The figure of 50% comes from the known ratio of the photoproduction cross sections for charged and neutral mesons (Silverman andStearns 1952, Steinberger andBishop 1952), and also from cosmic-ray data (Carlson, Hooper and King 1950). The results of this calculation are given in table 5.…”

Section: '(B) Relative Frequency Of Stars To Mesonsmentioning

confidence: 99%

“…The T observations of these workers have since been extended by many others. Mozley (1951) and Littauer and Walker (1951) showed that the cross section for r-meson production varied as A2'3, where A is the atomic number of the parent nucleus, and Steinberger and Bishop (1952) determined the energy and angular distributions of the mesons produced in carbon and hydrogen.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Macromolecular and Oligomeric Compounds as Stabilisers for Polymers

Terman¹,

Kochneva²

1972

Russ. Chem. Rev.

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The y-ray beam was incident normally on Ilford G5 nuclear research emulsions, and events occurring in the emulsion were studied. The events have been analysed, and particular attention paid t o interactions in which charged mesons leave tracks of length greater than 1.5" at right angles to the y-ray beam. About 50% of the observed photo-mesons are not accompanied by visible nuclear disintegration ' stars '. The energy spectrum of the emulsion photo-mesons has been measured. The ratio of stars to mesons is found to be 11.4 : 1. These results are all consistent with a theoretical model proposed b\ Butler, in which meson production is considered to take place preferentially on the surface of atomic nuclei. Several high-energy electrons and electron-pairs moving at right angles to the y-ray beam have been observed, and are accounted for.T h e observed cross section for the production of stars with three or more prongs is 2-9 x cm2 nucleus-IQP1 in agreement with the result of Miller and disagreement with that of Kikuchi. The relation of these results to observations of the electromagnetic excitation of nuclei by fast charged particles is considered.

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The Production of Positive Mesons by Photons

Cited by 47 publications

References 18 publications

Gauge invariant unitary theory for pion photoproduction

Gauge invariant unitary theory for pion photoproduction

Inclusive charged pion photoproduction on12C using tagged photons in the energy range (200?390) MeV

Macromolecular and Oligomeric Compounds as Stabilisers for Polymers

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