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

Full text (ru)

S. N. Fedotkin<sup>1

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

Abstract: The process of atomic shell ionization during annihilation of positron, emitted at β⁺-decay, with K-electron of daughter's atom is considered. The role of nuclear Coulomb field at calculation of the probability of this process is investigated. It is shown that the correct account of the influence of this factor on the states of electron and positron changes the probability of atomic ionization appreciably. The ratio of the probabilities of processes of atomic ionization and usual β⁺-decay is notably changed.

Keywords: annihilation, β⁺-decay, atomic shell, K-electron.

1. Mukoyama T., Shimizu S. Nuclear Excitation by Positron Annihilation. Phys. Rev. C 5 (1972) 95. https://doi.org/10.1103/PhysRevC.5.95

2. Vishnevskij I. N., Zheltonozhskij V. A., Svyato V. P., Trishin V. V. Pis'ma ZhETF 30 (1979) p. 394. (Rus).

3. Shimizu S., Mucoyama T., Nakayama Y. Radiationless Annihilation of Positron in Lead. Phys. Rev. 173 (1968) 405. https://doi.org/10.1103/PhysRev.173.405

4. Borozenets G. P., Vishnevskij I. N, Zheltonozhskij V. A. Yadernaya Fizika 43 (1986) p. 14 (Rus).

5. Kolomiets V. M., Puninskij O. G., Fedotkin S. N. Izv. AN SSSR. Ser. Fiz. 52 (1988) p. 12 (Rus).

6. Fedotkin S. N. Atomic ionization at annihilation of positrons emitted at β⁺-decay. Nucl. Phys. At. Energy 12 (2011) 335 (Rus). http://jnpae.kinr.kiev.ua/12.4/Articles_PDF/jnpae-2011-12-0335-Fedotkin.pdf

7. Lewis R. R., Ford G. R. Coulomb Effects in Inner Bremsstrahlen. Phys. Rev. 107 (1957) 756. https://doi.org/10.1103/PhysRev.107.756

8. Akhiezer A. I., Berestetskij V. B. Quantum Electrodynamics (Moskva: Fizmatgiz, 1959) 656 p. (Rus).

9. Glauber R. J., Martin P. C. Radiative Capture of Orbital Electrons. Phys. Rev. 104 (1956) 158. https://doi.org/10.1103/PhysRev.104.158

10. Konopinskij E., Rouz M. Theory of Nuclear Beta Decay. Alpha-, Beta- and Gamma-Spectroscopy Ed. by K. Zigban. Iss. 4 (Мoscow: Atomizdat, 1969) p. 18 (Rus).