Kjell J. Mork

National Institute of Standards and Technology

Elementary particlePhysicsElectronPhotonAttenuation coefficientLine (formation)Virtual particleAtomAtomic physicsNuclear physicsField (physics)Electron pairPositronRecoilPhoton energyQuantum electrodynamicsPair productionSpectral lineFermionCross section (physics)Two-photon physicsMomentumCompton scatteringAtomic numberQuantum mechanicsRadiative fluxBorn approximationRadiative transferRadiative equilibriumBremsstrahlungNuclear cross section

7Publications

6H-index

219Citations

Publications 7

Radiative correction to the equivalent-photon spectrum of a relativistic electron and the two-photon process

#1Martin LandrH-Index: 1

#2Kjell J. MorkH-Index: 6

Last. Haakon A. OlsenH-Index: 10

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On the basis of the improved Weizsaecker-Williams equivalent-photon spectrum of a fast charged particle, we calculate the radiative correction to this spectrum. The calculation involves the virtual-photon radiative correction, the soft- and hard-bremsstrahlung contributions, and the vacuum-polarization contribution. The results are used to calculate the radiative correction to two-photon production of neutral bosons and pair production of charged fermions and bosons. General features are that th...

#1Arne M. JohannessenH-Index: 1

#2Kjell J. MorkH-Index: 6

Last. I. ØverbøH-Index: 9

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#1I. ØverbøH-Index: 9

#2Kjell J. MorkH-Index: 6

Last. Haakon A. OlsenH-Index: 10

view all 3 authors...

#1Kjell J. Mork (NIST: National Institute of Standards and Technology)H-Index: 6

The cross section for the double Compton effect is integrated numerically in the laboratory system, and the effect of the radiative tail to the Compton line is discussed. The double Compton effect is also studied in the c. m. system for the cases in which the energy of one of the emitted photons is much smaller than the electron rest energy or much smaller than the energy of the incident photon. Expressions for the radiative corrections to the total cross section for Compton scattering are obtai...

#1I. ØverbøH-Index: 9

#2Kjell J. MorkH-Index: 6

Last. Haakon A. OlsenH-Index: 10

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Positron spectra and total cross sections for pair production in the field of an atom are calculated for a range of values of the atomic number and for photon energies below about 2.5 MeV. Screening effects by the atomic electrons are neglected. Good agreement with earlier theoretical calculations and with available experimental results is obtained.

#1Kjell J. Mork (NIST: National Institute of Standards and Technology)H-Index: 6

The cross section for production of electron pairs by unpolarized photons in the field of an electron is calculated. The total cross section is obtained by numerical integration. The contributions to the total cross section from different diagrams (exchange and \ensuremath{\gamma}\ensuremath{-}eterms) are calculated separately, and it is shown that Borsellino's result for the cross section is valid for photon energies above about 8 MeV, the deviation from the correct cross section being of or...

#1Kjell J. MorkH-Index: 6

#2Haakon Olsen (NIST: National Institute of Standards and Technology)H-Index: 3

The radiative corrections to the high-energy bremsstrahlung and pair-production spectra are calculated in the Weizs\"acker-Williams approximation. Results for the soft-photon radiative correction to the spectra are given, and for the case of pair production the soft-plus-hard-photon radiative correction is also obtained. The radiative correction to the total pair-production cross section is found to be practically independent of the photon energy and of the atomic number of the target material. ...