Comment on the high-frequency limit of the bremsstrahlung cross section

Haug, E.

doi:10.1016/0375-9601(74)90672-0

Cited by 2 publications

(2 citation statements)

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“…The high-frequency end point of a bremsstrahlung spectrum, usually called the spectrum 'tip', corresponds to interactions in which the kinetic energy of the incident electron is totally radiated. This part of the energy distribution has been of special theoretical interest since the beginning of the bremsstrahlung theory development [1][2][3][4][5][6][7][8][9][10][11], mainly motivated by the well-known limitations of the Bethe-Heitler formula [12] derived in the Born approximation.…”

Section: Introductionmentioning

confidence: 99%

“…This relative method circumvents the need to know the thickness of the targets using instead theoretical elastic-scattering cross sections to place the DDCSs on an absolute scale. The experiment aimed at testing the validity of the Elwert-Haug formalism [6,7] for medium-Z elements. Aehlig et al [23] found that, on average, their measured data were somewhat higher than the theoretical Elwert-Haug DDCSs, but the discrepancy did not exceed 20%.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of doubly differential electron bremsstrahlung cross sections at the end point (tip) for C, Al, Te, Ta and Au

García-Alvarez

Fernández-Varea

Vanin

et al. 2017

J. Phys. B: At. Mol. Opt. Phys.

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We have used the low-energy beam line of the São Paulo Microtron accelerator to study the maximum energy transfer point (tip) of electron-atom bremsstrahlung spectra for C, Al, Te, Ta and Au. Absolute cross sections differential in energy and angle of the emitted photon were measured for various electron kinetic energies between 20 and 100 keV, and photon emission angles of 35 • , 90 • and 131 • . The bremsstrahlung spectra were collected with three HPGe detectors and their response functions were evaluated analytically. Rutherford backscattering spectrometry allowed us to obtain the thicknesses of the targets with good accuracy. We propose a simple model for the tip region of the bremsstrahlung spectrum emitted at a given angle, whose adjustable parameters are the mean energy of the incident beam and its spread as well as an amplitude. The model was fitted simultaneously to the pulse-height distributions recorded at the three angles, determining the doubly differential cross sections from the corresponding amplitudes. The measured values have uncertainties between 3% and 13%. The agreement of the experimental results with the theoretical partial-wave calculations of Pratt and co-workers depends on the analyzed element and angle but is generally satisfactory. In the case of Al and Au, the uncertainty attributed to the theory is probably overestimated.

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