The tetra-neutron – experiment finds evidence for a long-sought particle comprising four neutrons

ScienceDaily
Dec 10, 2021, 10:31 am267 pts
While all atomic nuclei except hydrogen are composed of protons and neutrons, physicists have been searching for a particle consisting of two, three or four neutrons for over half a century. Experiments by a team of physicists now indicate that a particle comprising four bound neutrons may well exist.

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