Dynamics of population of gadolinium-156 nuclei energy levels during neutron pumping of isotope-modified gadolinium oxide

Igor V. Shamanin; Mishik A. Kazaryan; Sergei V. Bedenko; Vladimir V. Knyshev; Vitaly I. Shamanin

doi:10.1117/12.2550338

11 December 2019 Dynamics of population of gadolinium-156 nuclei energy levels during neutron pumping of isotope-modified gadolinium oxide

Igor V. Shamanin, Mishik A. Kazaryan, Sergei V. Bedenko, Vladimir V. Knyshev, Vitaly I. Shamanin

Author Affiliations +

Proceedings Volume 11322, XIV International Conference on Pulsed Lasers and Laser Applications; 1132212 (2019) https://doi.org/10.1117/12.2550338
Event: XIV International Conference on Pulsed Lasers and Laser Applications (AMPL-2019), 2019, Tomsk, Russian Federation

Abstract

The possibility of transformation of energy of fast and epithermal neutrons to energy of coherent photon radiation at the expense of a neutron pumping of the active medium formed by nucleus with long-living isomerous states is theoretically described. The channel of the nucleus formation in isomeric state as a daughter nucleus resulting from the nuclear reaction of neutron capture by a lighter nucleus is taken into consideration for the first time. The analysis of cross sections dependence of radiative neutron capture by the nuclei of gadolinium isotopes Gd¹⁵⁵ and Gd¹⁵⁶ is performed. As a result, it is stated that the speed of Gd¹⁵⁶nuclei formation exceeds the speed of their “burnup” in the neutron flux. It is provided by a unique combination of absorbing properties of two isotopes of gadolinium Gd¹⁵⁵ and Gd¹⁵⁶in both thermal and resonance regions of neutron energy. The possibility of excess energy accumulation in the participating medium created by the nuclei of the pair of gadolinium isotopes Gd¹⁵⁵ and Gd¹⁵⁶ due to formation and storage of nuclei in isomeric state at radiative neutron capture by the nuclei of the stable isotope with a smaller mass is shown. It is concluded that when the active medium created by gadolinium nuclei is pumped by neutrons with the flux density of the order of 10¹³ cm^-2·s^-1, the condition of levels population inversion can be achieved in a few tens of seconds. The wave length of the radiation generated by the medium is 0.0006 nm.

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Igor V. Shamanin, Mishik A. Kazaryan, Sergei V. Bedenko, Vladimir V. Knyshev, and Vitaly I. Shamanin "Dynamics of population of gadolinium-156 nuclei energy levels during neutron pumping of isotope-modified gadolinium oxide", Proc. SPIE 11322, XIV International Conference on Pulsed Lasers and Laser Applications, 1132212 (11 December 2019); https://doi.org/10.1117/12.2550338

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