Coherent gamma photon generation in a Bose-Einstein condensate of $^{135m}$Cs

TL;DR

This paper proposes a novel method to generate coherent gamma photons using a Bose-Einstein condensate of $^{135m}$Cs, overcoming previous limitations related to atomic system properties and density requirements.

Contribution

It introduces a new collective nuclear de-excitation mechanism in a BEC of $^{135m}$Cs for gamma photon generation, not relying on traditional super-radiance or high densities.

Findings

Identified a nuclear de-excitation process suitable for gamma coherence

Proposed a feasible experimental approach with current technology

Overcomes limitations of previous gamma-ray coherence methods

Abstract

We have identified a mechanism of collective nuclear de-excitation in a Bose-Einstein condensate of $^{135}$Cs atoms in their isomeric states, $^{135m}$Cs, suitable for the generation of coherent gamma photons. The process described here does not correspond to single-pass amplification, which cannot occur in atomic systems due to the large shift between absorption and emission lines, nor does it require the large densities associated to standard Dicke super-radiance. It thus overcome the limitations that have been hindering the generation of coherent gamma rays in many systems. Therefore, we propose an approach for generation of coherent gamma rays, which relies on a combination of well established techniques of nuclear and atomic physics, and can be realized with currently available technology.