Continuous x-rays produced in light-ion atom collisions have been experimentally and theoretically studied. The experimental results for aluminum target bombarded with ∼1.5 MeV protons can be mainly explained by atomic bremsstrahlung (AB) of K-shell electrons. We measured the continuous x-ray spectra from a silver target and gold target bombarded with 1.5 MeV protons at the detection angle of 90° with respect to the beam direction to investigate AB of L- and M-shell electrons and found that the experimental production cross-sections of continuous x-rays are much smaller than the predictions based on the plane wave born approximation (PWBA) theory of AB. The discrepancy can be reduced by taking account of a screening effect previously introduced, but this does not resolve the problem completely. We applied the theory of AB based on the binary encounter approximation (BEA) and compared this with the experiment. It is shown by the BEA theory that, without consideration of the screening effect, the agreement between the theory and the experimental cross-sections of the Al target, Ag target and Au target can be systematically explained by the AB of K-, L- and M- electrons, respectively.
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