Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

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M. F. Mitrokhovich<sup>1

1</sup>Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine

Abstract: Registering coincidences of γ-quanta with electrons and with low (close to zero) energy electrons, the spatial correlation of the direction of emitted accompanying e_ac particle (electron "shake-off", Auger electron) with the primary particle e_m (electron) at β-decay or internal conversion of transitions in ¹⁵²Eu decay have been investigated. By measuring the double γe_ac and triple γe_ace_m coincidences, the correlation ϒ = 4πdP/PdΩ between the accompanying particle and the main particle was measured when they were emitted into the same hemisphere (Ω = 0) or into the opposite hemispheres (Ω = 2π). It was obtained that ϒ (Ω = 0) >> 1, and ϒ (Ω = 2π) << 1. It is discussed the mechanism of the strong directional correlation in the motion of accompanying particle with the main particle in the process of radioactive decay and internal conversion taking into account the current components of electron-electron interaction in the final state.

Keywords: β-decay, conversion electron, "shake-off" electron, ¹⁵²Eu.

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