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We report on simultaneous measurements of the continuum momentum distribution for RECC cusp electrons and bremsstrahlung in 90AMeV U 88+ + N2→ U 88+ + {N2 +* } + ecusp(0 0 ) + hn (RECC) collisions. We show that x-ray photons which appear coincident with RECC cusp electrons stem from the short-wavelength limit of the electron-nucleus bremsstrahlung. The observed pronounced asymmetric cusp shape is in good agreement with theory within the relativistic impulse approximation. We expect that when exploiting the full imaging properties of our forward electron spectrometer, fully differential cross sections at the tip region of the bremsstrahlung spectrum with near 10 -4 electron energy resolution are possible in the near future.

Radiative electron capture to continuum (RECC) and the short-wavelength limit of electron–nucleus Bremsstrahlung in near-relativistic collisions