Angular dependence of M x-ray production differential cross-sections at 5.96 keV

The knowledge of the angular dependence of M shell production differential cross-sections is important because of their extensive use in basic studies of photoelectric effect, characteristic X-ray production, internal conversion of γ-rays, radiative and non-radiative transition probabilities and development of more reliable angular dependence theoretical models describing fundamental inner-shell ionization processes. The angular dependence of M X-ray production differential cross-sections for selected heavy elements between Lu and Pt have been measured at 5.59 keV incident photon energy, at seven emission angles in the range 120° - 150° at intervals of 5°. The emission angle was set to 0°. The target M X-ray spectra were recorded by the collimated Si(Li) detector, which has an active area of 12.5 mm2, a sensitive crystal depth of 3 mm and a Be window of 0.025 mm thickness. The measured energy resolution of the detector system was 188 eV for an amplifier shaping time constant of 6 ps at the 5.9 keV peak of 55Fe. Angular dependence M X-ray production differential cross-sections have been derived, using the M-shell fluorescence yields, experimental total M X-ray production cross-sections and theoretical M-shell photoionization cross-sections. M X-ray production differential cross-sections are found to decrease with increase in the emission angle, showing an anisotropic spatial distribution of M X-rays. To the best of our knowledge, no other experimental results are available for worked elements in the angular range 120°-150° for comparison with present results. Extracted results have been compared with the theoretical predictions and semi empirical fits. The present experimental results are in good agreement with the theoretical values.

Keywords

Angular dependence, açısal bağımlık, M x-ray production differential cross-sections, M x-ışını üretimi diferansiyel kesitleri, 5.96 keV

Citation

Durak, R. ... [ve arkadaşları]. (2006). Angular dependence of M x-ray production differential cross-sections at 5.96 keV. The Fourth Eurasian Conference on Nuclear Science and Its Application : Presentations, (s. 135-140). 31 October-3 November 2006. Baku, Azerbaijan.

URI

http://kurumsalarsiv.tenmak.gov.tr/handle/20.500.12878/1048

Collections

IV. Eurasian conference on nuclear science and its application : presentations, 31 October- 3 November 2006. Baku, Azerbaijan.

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