Measurement of the absolute cross section for the elementary process of atomic field bremsstrahlung

Abstract

Coincidence measurements of the absolute cross section for the production of bremsstrahlung by electrons in the field of gold atoms are reported. The incident electron energy T o was 300keV. Measurements were made for four different combinations of electron scattering angle and photon emission angle over a wide range of the relative photon energy kiT o up to k/To=0.83. The measured cross sections are compared with results of Bethe-Heitler and Elwert-Haug calculations

Polarization of atomic bremsstrahlung in coincidence studies

“…In recent decades, the triple-differential bremsstrahlung cross section has been measured in several experiments [10,11,28]. In these experiments, among other things, the angular distribution of bremsstrahlung was studied as a function of the photon emission angle.…”

“…Due to experimental limitations, less attention was paid to setups where the emitted photons and the scattered electrons are observed in coincidence. First steps towards such coincidence experiments were made by Aehlig et al [10,11] and Mergl et al [12] and were reviewed by Nakel [13]. In these experiments, the angular distribution of bremsstrahlung was measured for a fixed electron scattering angle.…”

Advances in bremsstrahlung: a review

“…Experiments where the photon intensity at a fixed angle is measured in coincidence with the scattered electron, and subsequently put on an absolute scale, are quite rare. Early coincidence experiments were performed by Aehlig and coworkers [4,3] who did record the photon intensity, and later by Nakel and his group [44], who in many cases normalized their data to the SM theory. All these measurements were done in coplanar geometry, where the electron detector is placed in the reaction plane which is defined by the beam axis and the photon spectrometer.…”

“…5.2.10). While the absolute intensity was not recorded simultaneously with the measurement of C 200 , there exist a few data by Aehlig et al [3] and by Geisenhofer and Nakel [33], taken from their spectral distribution. At the forward angles screening is important, lowering the triply differential cross section by up to 50 percent, as compared to the Dirac partial-wave results for a Coulomb potential with Z T = 79.…”

The polarization of bremsstrahlung from radiative ionization induced by relativistic highly charged projectiles

“…These functions got established in bremsstrahlung calculations by the seminal work of Elwert and Haug [8], and their applicability for the differential cross sections was supported by later calculations using exact relativistic wavefunctions [9][10][11][12]. An overview of the calculations in comparison with experimental data (far off the SWL) can be found in [13][14][15][16].…”