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Current issue   Ukr. J. Phys. 2014, Vol. 58, N 7, p.618-627


Dzyublik A.Ya.

Institute for Nuclear Research, Nat. Acad. of Sci. of Ukraine
(47, Prosp. Nauky, Kyiv 03680, Ukraine; e-mail: dzyublik@ukr.net)

Nuclear Excitation by Electron Transitions

Section: Nuclei and nuclear reactions
Original Author's Text: English

Abstract: A theory of the nuclear excitation by an electron transition (NEET) induced by x-rays is developed on the basis of the strict collision theory. All stages of the process are considered, including the formation of a hole in an inner electronic shell, its decay leading to the excitation of the nucleus, as well as the subsequent filling of the upper level vacancy and the deexcitation of the nucleus. The cross sections are calculated for NEET and the photoabsorption of x-rays near the absorption edge. The results agree with the data of Kishimoto et al. for NEET on 197Au. In addition, we discuss the NEET mechanism of triggering of the 31-year isomer 178Hf m2 via an intermediate level induced by x-rays. We have shown that the 2% decay acceleration of this isomer declared by Collins et al. is realistic if the nucleus attributes a triaxial shape in the intermediate state, and there exists an additional rotational band with the 13 level.

Key words: nuclear isomers, Hf, NEET, induced nuclear decay, x-rays