Angular dependence ofLx-ray production cross sections in uranium at 22.6- and 59.5-keV photon energies

X-ray fluorescence activities at Saha Institute of Nuclear Physics, India

“…The two major observations in our study were (i) our angular distribution data did not show any sharp decrease with the increase of angle as was observed by the group of Patiala and Turkey, whereas it showed almost isotropic behaviour as observed by [29][30][31][32][33][34], and (ii) the alignment parameter of Au was very small. Demir et al [24] Seven and Kocak [26] Intensity Angle in degree …”

“…Data from different groups show contradictory results. The groups at Patiala, India [17][18][19][20] and in Turkey [21][22][23][24][25][26][27][28] got very strong anisotropy while the others [29][30][31][32][33][34][35][36] observed no anisotropy or very little anisotropy in their measurements. Moreover, it is observed that the theoretical value of the alignment parameter based on non-relativistic calculation of Berezhko et al [37] are 2-3 times higher than the experimental values of Küst et al [35], almost five times larger in the case of Papp and Campbell [29] and about half of the experimental values of Yamaoka et al [34].…”

Measurement of L subshell photoionisation cross sections of Th and U at 22.6, 25.8, 29.2 and 32.9kev

“…Although there are conflicting reports on the anisotropic emission of photon induced L X-ray lines (Ertugrul, 1996;Seven, 2004;Kahlon et al, 1991;Mehta et al 1999;Kumar et al, 2001;Sharma and Allawadhi, 1999), a recent precise measurement on this effect (Yamaoka et al, 2002;Santra et al, 2007) reveals that the anisotropy if it exists at all, is within the experimental error. So, in this present analysis, no correction has been made for the anisotropic emission of the L X-ray lines.…”

“…Measurement of the angular distribution of photon-induced fluorescence X-rays in Th and U was done by Kahlon et al (1991) at 59.57 keV. Mehta et al (1999) measured the angular dependence of L X-ray production cross sections in U at 22.6 and 59.5 keV photon energies. Kumar et al (2001) measured the L X-ray production cross sections of Th and U at 17.8, 25.8 and 46.9 keV photon energies.…”

Angular Dependence of Fluorescence X-Rays and Alignment of Vacancy State Induced by Radioisotopes

“…The measured intensity ratios for various L x-rays were found to be angle independent within experimental error. Mehta et al, (1999) …”