Measurement of doubly differential electron bremsstrahlung cross sections at the end point (tip) for C, Al, Te, Ta and Au
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2017
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Journal of Physics B: Atomic, Molecular and Optical Physics
Resumo
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.
Como referenciar
GARCIA-ALVAREZ, J.A.; FERNANDEZ-VAREA, J.M.; VANIN, V.R.; SANTOS, O.C.B.; BARROS, S.F.; MALAFRONTE, A.A.; RODRIGUES, C.L.; MARTINS, M.N.; KOSKINAS, M.F.; MAIDANA, N.L. Measurement of doubly differential electron bremsstrahlung cross sections at the end point (tip) for C, Al, Te, Ta and Au. Journal of Physics B: Atomic, Molecular and Optical Physics, v. 50, n. 15, p. 1-14, 2017. DOI: 10.1088/1361-6455/aa7ac4. Disponível em: http://repositorio.ipen.br/handle/123456789/27742. Acesso em: 19 Apr 2024.
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