A tetraneutron is a hypothesised stable cluster of four neutrons. The existence of this cluster of particles is not supported by current models of nuclear forces.[1] There is some empirical evidence suggesting that this particle does exist, based on an experiment by Francisco-Miguel Marqués and co-workers at the Ganil accelerator in Caen using a novel detection method in observations of the disintegration of beryllium and lithium nuclei.[2] However, subsequent attempts to replicate this observation have failed.

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