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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish
Title of host publicationXIV International Conference on Pulsed Lasers and Laser Applications
EditorsVictor F. Tarasenko, Anton V. Klimkin, Maxim V. Trigub
PublisherSPIE
ISBN (Electronic)9781510634114
DOIs
Publication statusPublished - 2019
EventXIV International Conference on Pulsed Lasers and Laser Applications, AMPL 2019 - Tomsk, Russian Federation
Duration: 15 Sep 201920 Sep 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11322
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceXIV International Conference on Pulsed Lasers and Laser Applications, AMPL 2019
CountryRussian Federation
CityTomsk
Period15.9.1920.9.19

Keywords

  • Active medium
  • Gadolinium isotopes
  • Inversion of energy levels population
  • Neutron pumping

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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