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Title of Journal: Nuovo Cim

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Abbravation: Il Nuovo Cimento (1955-1965)

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Società Italiana di Fisica

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DOI

10.1016/0024-6301(91)90198-w

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1827-6121

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The scattering of photons by photons

Authors: B De Tollis
Publish Date: 2007/10/28
Volume: 35, Issue: 4, Pages: 1182-1193
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Abstract

The general expressions for the five independent amplitudes of photonphoton scattering are given in a rather compact form It has been shown in detail in a previous paper 1 that this result is easily obtained for all the values of the energy and of the angle with the aid of the dispersion relations techniques In that paper one particular amplitude was calculated using the doubledispersive representation and the Cutkosky rules for the calculation of the spectral functions at the lowest perturbative order The knowledge of the amplitudes for any value of the angle enables one to make the numerical evaluation of the total crosssection The curve of the total crosssection as a function of the energy for unpolarized photons is given in the last Section The maximum of the total crosssection σ unp max ≈16 µb is reached when the energy of each photon is about 07 MeV in the centerofmass system In the last Section angular distributions for unpolarized as well as polarized photons are givenVengono date in forma abbastanza compatta le espressioni generali per le cinque ampiezze indipendenti dello scattering fotonefotone In un precedente lavoro si è mostrato in dettaglio che è semplice ottenere questo risultato per qualsiasi valore dell’energia e dell’angolo usando le tecniche dispersive In quel lavoro è stata calcolata una particolare ampiezza usando la rappresentazione dispersiva doppia e le regole di Cutkosky per il calcolo delle funzioni spettrali all’ordine perturbativo più basso La conoscenza delle ampiezze per qualsiasi valore dell’angolo permette di valutare numericamente la sezione d’urto totale Nell’ultimo paragrafo è data la curva della sezione d’urto totale in funzione dell’energia nel caso di fotoni non polarizzati Il massimo della sezione d’urto totale σ unp max ≈16 µb si ha quando l’energia di ciascun fotone nel sistema del centro di massa è di circa 07 MeV Nell’ultimo paragrafo vengono date inoltre alcune distribuzioni angolari per fotoni polarizzati e non polarizzati

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  1. Bound states, shadow states and mandelstam representation
  2. Effects of phonon pulses on the energy gap in a superconductor
  3. The renormalization of Dirac-Maxwell equations
  4. Remarks on the generators of the SU 3 group
  5. On l -forbidden M 1 transitions
  6. Determination of the ultrasonic absorption coefficient in liquids by the thermal method
  7. On a quadrilinear K 2 -π 2 coupling
  8. Large-angle cross-sections p+p→A+B and π+p→A+B at high energies predicted by the statistical model
  9. The equilibrium phase transition in liquid helium
  10. The range in G5 nuclear emulsion of protons with energies 87, 118 and 146 MeV
  11. The grain-density of emulsion tracks
  12. Muon capture in certain light nuclei
  13. A novel approach to elementary scattering theory
  14. Compound-nucleus radiative capture cross-section in the mev energy-range and nuclear-level density
  15. Sur le calcul des constantes vibrationnelles de l’oxyde azoteux
  16. Polarization effects in bremsstrahlung
  17. A renormalized, ghost-free lee model
  18. Investigation of the possibility of a π-λ resonance in the case of different parities of λ and ɛ
  19. The high-energy muon flux at sea level obtained from an observation of the burst-size spectrum
  20. $$\bar K - \mathcal{N}$$ scattering in the mandelstam representationscattering in the mandelstam representation
  21. 232 Th and 238 U fission induced by low-energy monochromatic γ-rays
  22. Representations of the Poincaré group associated to complex energy-momentum
  23. Representations of the Poincaré group associated to complex energy-momentum
  24. On the measurements of ionization in nuclear plates
  25. On the energy and pulse spectra of a fast ionization chamber
  26. On a new approach to alpha-decay and its application to the angular correlation of the decay $${}^{233}U\mathop \to \limits_\alpha {}^{229}Th\mathop \to \limits_\gamma {}^{229}Th$$
  27. Measurements on the cosmic radiation intensity in the mont blanc tunnel
  28. Energy-momentum transfers in high-energy nuclear collisions
  29. Multiple small angle scattering of waves by an inhomogeneous medium
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