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In the CERN NA63 collaboration we have addressed the question of thepotential inadequacy of the commonly used Migdal formulation of theLandau-Pomeranchuk-Migdal (LPM) effect by measuring the photon emission by 20and 178 GeV electrons in the range 100 MeV - 4 GeV, in targets ofLowDensityPolyEthylene (LDPE), C, Al, Ti, Fe, Cu, Mo and, as a referencetarget, Ta. For each target and energy, a comparison between simulated valuesbased on the LPM suppression of incoherent bremsstrahlung is shown, takingmulti-photon effects into account. For these targets and energies, we find thatMigdal's theoretical formulation is adequate to a precision of better thanabout 5%, irrespective of the target substance.

Experimental investigation of the Landau-Pomeranchuk-Migdal effect in low-Z targets