The experimental investigation of weak effects in the KLL Auger electron spectrum of Zr and Nb generated in radioactive decay

0499100 - ÚJF 2019 RIV NL eng J - Journal Article
Inoyatov, A. K. - Kovalík, Alojz - Perevoshchikov, L. L. - Filosofov, D. V. - Ekman, J. - Vénos, Drahoslav - Muminov, T. M. - Radchenko, V. - Zhdanov, V. S.
The experimental investigation of weak effects in the KLL Auger electron spectrum of Zr and Nb generated in radioactive decay.
Journal of Electron Spectroscopy and Related Phenomena. Roč. 229, č. 12 (2018), s. 61-67. ISSN 0368-2048. E-ISSN 1873-2526
R&D Projects: GA MŠMT LTT18021
Institutional support: RVO:61389005
Keywords : Zr-90 * Nb-90 * Nb-91m * KLL Auger transitions * Atomic structure effect * Multiconfiguration Dirac-Hartree-Fock * calculations
OECD category: Nuclear physics
Impact factor: 1.343, year: 2018

The KLL Auger electron spectra of Zr (Z = 40) and Nb (Z = 41) following respectively the electron capture (EC) decay of Nb-90 and the de-excitation of the isomeric state of Nb-91m were investigated in detail using a combined electrostatic electron spectrometer and radioactive sources prepared by surface sorption on a polycrystalline carbon substrate. For both elements, energies, relative intensities, and natural widths of all the nine well-resolved basic spectrum components were determined and compared with theoretical predictions and with results of previous measurement as well. Results of our ab initio multieonfiguration Dirac-Hartree-Fock calculations are discussed also in relation to the solid-state effect. Indications of an influence of the EC decay on the absolute energy of the KL2L3(D-1(2)) transition (so-called atomic structure effect) in Zr were found. The effect of the retarded current-current interaction on the KL1L2(P-3(0)) transition intensity was observed to be appreciable for the investigated elements in accordance with the prediction.
Permanent Link: http://hdl.handle.net/11104/0291376