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Soviet Journal of Quantum Electronics

Simulated emission from cooled nuclear beams

Лев Абрамович Ривлин

Published May 31, 1992• 9 citations
Publisher

Abstract

An analysis is made of an experimental setup to observe negative absorption of γ photons by nuclei without total population inversion. The system includes an intensive cooling operation which radically suppresses the negative influence of the Doppler broadening of a non-Mössbauer line. Estimates indicate that a positive gain is feasible.

DOI
10.1070/qe1992v022n05abeh003488

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An analysis is made of an experimental setup to observe negative absorption of γ photons by nuclei without total population inversion. The system includes an intensive cooling operation which radically suppresses the negative influence of the Doppler broadening of a non-Mössbauer line. Estimates indicate that a positive gain is feasible.
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The evolution of the foreign and native search for solving the problem of a nuclear gamma-ray laser (NGL), which has been attracting attention for almost half a century despite the absence at present of any convincing data about its experimental solution, is considered. It is shown that the key conflict inherent in any conception of the NGL is the antagonism between the necessity to accumulate a sufficient amount of excited nuclei and the requirement to narrow down the emission gamma-ray line to its natural radiative width. The critical analysis of different approaches for solving this conflict (Mössbauer scheme, deeply cooled ensembles of free nuclei with the hidden inversion, nuclear inversionless amplification, two-quantum gamma emission in counterpropagating photon beams, hypothetical amplifying medium of long-lived isomers in a Bose—Einstein condensate) shows that this search is important not only due to the expected result, which could stimulate the development of quantum nucleonics as a new branch in physics, but also is of interest due to a variety of physical disciplines and experimental approaches used in this search.