Enhanced lifetime of positronium atoms via collective radiative effects

TL;DR

This paper proposes a method to significantly extend the lifetime of positronium atoms by utilizing collective radiative effects like superradiance and subradiance, controlled through gas density and laser intensity.

Contribution

It introduces a novel approach to manipulate positronium annihilation dynamics using collective emission effects in a dense gas with laser and cavity fields.

Findings

Positronium lifetime increased over 100 times.

Controlled by gas density and laser intensity.

Demonstrates potential for extended positronium applications.

Abstract

A method is proposed to manipulate the annihilation dynamics of a dense gas of positronium atoms employing superradiance and subradiance regimes of the cooperative spontaneous emission of the system. The annihilation dynamics is controlled by the gas density and by the intensity of the driving strong resonant laser field. In particular, the method allows to increase the annihilation lifetime of an ensemble of positronium atoms more than hundred times by trapping the atoms in the excited state via collective radiative effects in the resonant laser and cavity fields.