Measurement of angular dependence of M X-ray production cross-sections in Re, Bi and U at 5.96 keV


APAYDIN G. , TIRAŞOĞLU E. , Sogut O.

EUROPEAN PHYSICAL JOURNAL D, vol.46, no.3, pp.487-492, 2008 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 46 Issue: 3
  • Publication Date: 2008
  • Doi Number: 10.1140/epjd/e2007-00331-2
  • Title of Journal : EUROPEAN PHYSICAL JOURNAL D
  • Page Numbers: pp.487-492

Abstract

The M X-ray production differential cross sections in Re, Bi and U elements have been measured at the 5.96 keV incident photon energy in an angular range 135 degrees-155 degrees. The measurements were performed using a Fe-55 source and a Si(Li) detector. The present results contradict the predictions of Cooper and Zare [Atomic Collision Processes, Gordon and Breach, New York (1969)] and experimental results of Kumar et al. [J. Phys. B: At. Mol. Opt. 34, 613 (2001)]. that, after photoionization of inner shells, the vacancy state has equal population of magnetic substates and the subsequent X-ray emission is isotropic, but confirm the predictions of the calculations of Flugge et al. [Phys. Rev. Lett. 29, 7 (1972)] and experimental results of Sharma and Allawadhi [J. Phys. B: At. Mol. Opt. 32, 2343 (1999)] and Ertugrul [Nucl. Instrum. Meth. B 119, 345 (1996)]. Total M X-ray production cross sections from the decay at the 5.96 keV photon energies are found to be in good agreement with the calculated theoretical results using the theoretical values of M shell photoionization cross section.