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Tetraneutron
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.〔
〕 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.〔
〕 However, subsequent attempts to replicate this observation have failed.
== Marqués' experiment ==
As with many particle accelerator experiments, Marques' team fired atomic nuclei at carbon targets and observed the "spray" of particles from the resulting collisions. In this case the experiment involved firing beryllium-14, beryllium-15 and lithium-11 nuclei at a small carbon target, the most successful being beryllium-14. This isotope of beryllium has a nuclear halo that consists of four clustered neutrons; this allows it to be easily separated intact in the high-speed collision with the carbon target. Their approach to the production and detection of bound neutron clusters was .〔 Current nuclear models suggest that four separate neutrons should result when beryllium-10 is produced, but the single signal detected in the production of beryllium-10 suggested a multineutron cluster in the breakup products; most likely a beryllium-10 nucleus and four neutrons fused together into a tetraneutron.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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