Photon-absorption cross sections between 3 and 30 MeV

Sherman, N. K.; Ross, C. K.; Lokan, K.H.

doi:10.1103/physrevc.21.2328

Cited by 16 publications

(9 citation statements)

References 15 publications

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“…The HGØ computed tabulation of k n and k e , summed together with the incoherent and coherent scattering cross sections and the atomic photo effect, have been shown to be in close agreement with measurements in the photonuclear region by Gurevich et al (1980) and Sherman et al (1980Sherman et al ( , 1985Sherman et al ( , 1987 Ewart (1981, 1983), Sherman and DelBianco (1988), and a considerable improvement, for high-Z materials, over the 1969 values by Hubbell (1969) and Storm and Israel (1970) which appear to be as much as 4% low for the highest Zs in this energy region.…”

Section: Pair and Triplet Measurements: A Brief History And Surveysupporting

confidence: 73%

“…Preliminary examination and evaluation of the available old and new treatments, experimental (e.g., Sherman et al, 1980Sherman et al, , 1985Sherman et al, , 1987Ewart, 1981, 1983;Sherman and DelBianco, 1988;Gurevich et al, 1980;Dauvergne et al, 2003) and theoretical, suggests that new calculations are advisable, but no dramatic changes in recommended cross sections are anticipated, likely 2-3% at most. However, it is obvious that new computations, beyond HGØ (1980), will again be a ''witch's brew,'' combining interdependent theoretical models, effects and corrections, a worthy challenge for the next table-maker of high-energy photon cross sections and attenuation coefficients to serve the medical, industrial and other user communities who require such data.…”

Section: Discussionmentioning

confidence: 99%

“…This complicating factor, however, stimulated a number of high-accuracy total attenuation coefficient measurements in regions from a few MeV up to a few tens of MeV, for example the works Ahrens et al (1971), Gimm and Hubbell (1978), Gurevich et al (1980) and Sherman et al (1980Sherman et al ( , 1985Sherman et al ( , 1987, Ewart (1981, 1983), Sherman and DelBianco (1988). The primary objective of these measurements was to isolate and evaluate the photonuclear giant resonance cross sections.…”

Section: Pair and Triplet Measurements: A Brief History And Surveymentioning

confidence: 99%

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Electron–positron pair production by photons: A historical overview

Hubbell

2006

Radiation Physics and Chemistry

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This account briefly traces the growth of our theoretical and experimental knowledge of electron-positron pair production by photons, from the prediction of the positron by Dirac [1928a can interact with the Coulomb field of an atomic nucleus to be transformed into an electron-positron pair, the probability increasing with increasing photon energy, up to a plateau at high energies, and increasing with increasing atomic number approximately as the square of the nuclear charge (proton number). This interaction can also take place in the field of an atomic electron, for photons of energy in excess of 4m e c 2 (2.044 MeV), in which case the process is called triplet production due to the track of the recoiling atomic electron adding to the tracks of the created electron-positron pair. The last systematic computations and tabulations of pair and triplet cross sections, which are the predominant contributions to the photon mass attenuation coefficient for photon energies 10 MeV and higher, were those of Hubbell et al. [Pair, triplet, and total atomic cross sections (and mass attenuation coefficients) for 1 MeV-100 GeV photons in elements Z ¼ 1-100. J. Phys. Chem. Ref. Data 9, 1023Data 9, -1147, from threshold (1.022 MeV) up to 100 GeV, for all elements Z ¼ 1-100. These computations required some ad hoc bridging functions between the available low-energy and high-energy theoretical models. Recently (1979Recently ( -2001, Sud and collaborators have developed some new approaches including using distorted wave Born approximation (DWBA) theory to compute pair production cross sections in the intermediate energy region (5.0-10.0 MeV) on a firmer theoretical basis. These and other recent developments, and their possible implications for improved computations of pair and triplet cross sections, are discussed. Published by Elsevier Ltd.

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Section: Pair and Triplet Measurements: A Brief History And Surveysupporting

confidence: 73%

Section: Discussionmentioning

confidence: 99%

Section: Pair and Triplet Measurements: A Brief History And Surveymentioning

confidence: 99%

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Electron–positron pair production by photons: A historical overview

Hubbell

2006

Radiation Physics and Chemistry

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“…Shown in Figs. 6 and 7 is the ratio S = (σ coh −σ B )/σ the result of Øverbø [9]; experimental data from [23]. solid curves, those of Øverbø are shown as dashed curves.…”

Section: Screening Correctionsmentioning

confidence: 99%

High-energy expansion of Coulomb corrections to thee+e−photoproduction cross section

Lee¹,

Milstein²,

Strakhovenko³

2004

Phys. Rev. A

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First correction to the high-energy asymptotics of the total e + e − photoproduction cross section in the electric field of a heavy atom is derived with the exact account of this field. The consideration is based on the use of the quasiclassical electron Green function in an external electric field. The next-to-leading correction to the cross section is discussed. The influence of screening on the Coulomb corrections is examined in the leading approximation. It turns out that the high-energy asymptotics of the corresponding correction is independent of the photon energy. In the region where both produced particles are relativistic, the corrections to the high-energy asymptotics of the electron (positron) spectrum are derived. Our results for the total cross section are in good agreement with experimental data for photon energies down to a few M eV . In addition, the corrections to the bremsstrahlung spectrum are obtained from the corresponding results for pair production.

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“…The experimental cross section s exp is taken from Sherman et al (1980) for Bi, from Rosenblum et al (1952), Gimm and Hubbell (1978) for Pb, and from Sherman et al (1980) for Ta. The quantity S is compared with ðs ð1Þ C þ s ð2Þ C Þo=ms 0 , Eqs.…”

Section: Shown Inmentioning

confidence: 99%