The quest for light multineutron systems

TL;DR

This paper reviews the extensive research on the existence of bound or resonant states in light multineutron systems, highlighting experimental and theoretical approaches and discussing future directions.

Contribution

It provides a comprehensive overview of past and current methods used to investigate light multineutron systems, emphasizing the challenges and unresolved issues.

Findings

Various detection and calculation techniques have been employed.

No conclusive evidence of bound or resonant multineutron states has been established.

Future research directions are discussed to address existing challenges.

Abstract

The long history of the research concerning the possible existence of bound or resonant states in light multineutron systems, essentially $^3$n and $^4$n, is reviewed. Both the experimental and the theoretical points of view have been considered, with the aim of showing a clear picture of all the different detection and calculation techniques that have been used, with particular emphasis in the issues that have been found. Finally, some aspects of the present and future research in this field are discussed.