Coherent Nuclear Radiation

TL;DR

This review comprehensively covers the theory and experimental observations of coherent nuclear radiation, including various superradiance phenomena, and explores conditions for realizing spin superradiance and nuclear matter lasing.

Contribution

It provides a detailed theoretical framework and experimental analysis of nuclear spin superradiance and related coherent radiation phenomena, highlighting new insights into their development and control.

Findings

Development of a comprehensive theory of nuclear spin superradiance

Experimental confirmation of various superradiance types

Analysis of conditions for spin superradiance in magnetic molecules

Abstract

The main part of this review is devoted to the comprehensive description of coherent radiation by nuclear spins. The theory of nuclear spin superradiance is developed and the experimental observations of this phenomenon are considered. The intriguing problem of how coherence develops from initially incoherent quantum fluctuations is analysed. All main types of coherent radiation by nuclear spins are discussed, which are: free nuclear induction, collective induction, maser generation, pure superradiance, triggered superradiance, pulsing superradiance, punctuated superradiance, and induced emission. The influence of electron-nuclear hyperfine interactions and the role of magnetic anisotropy are studied. Conditions for realizing spin superradiance by magnetic molecules are investigated. The possibility of nuclear matter lasing, accompanied by pion or dibaryon radiation, is briefly touched.