Summary
The Bethe-Rohrlich approximation for small angle Delbrück scattering, which is valid for photon energies of some l00MeV, can be easily modified so as to be also applicable at low energies of a few MeV. This allows to calculate the real and imaginary part of the scattering amplitude at low energies and scattering angles not larger than some 10 mrad. There the real part is found to be in general at most equal in magnitude to the imaginary part. Since only the real part gives evidence for the existence of the polarization of the vacuum, the possibility of its observation in experiments at a few MeV and small scattering angles is discussed.
Riassunto
Si può facilmente modificare l’approssimazione di Bethe-Rohrlich per lo scattering di Delbrück a piocoli angoli, che è valida per énergie dei fotoni di aleune centinaia di MeV, in modo da renderla applicabile anche alle basse énergie di pochi MeV. Ciò permette di calcolare la parte reale e quella immaginaria dell’ampiezza di scattering alle basse energie ed ad angoli di scattering non maggiori di alcune decine di mrad. Qui si trova ehe la parte reale è in generale al massimo uguale alla parte immaginaria. Poichè solo la parte reale fornisce le prove dell’esistenza della polarizzazione del vuoto, si discute la possibilità di osservarla in esperimenti a pochi MeV e a piocoli angoli di scattering.
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Ehlotzky, F. Small-angle Delbrück scattering. Nuovo Cim 31, 1037–1046 (1964). https://doi.org/10.1007/BF02821676
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DOI: https://doi.org/10.1007/BF02821676