The quest for light multineutron systems

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.

Unnuclear physics

“…Nuclear reactions involving three and four neutrons in the final states have been investigated in the searches for bound trineutron and tetraneutrons or narrow resonances (see, e.g., Ref. [25][26][27]). Our prediction is made under the assumption that there is no narrow resonance with energy comparable or less than the kinetic energy of the neutrons in the frame of their center of mass.…”