Physicists find signs of four-neutron nucleus

Potential existence of ‘tetraneutron’ defies theoretical expectations

tetraneutrons

NO PROTONS ALLOWED  The collision of two varieties of helium nuclei at a Japanese lab produced beryllium nuclei and tetraneutrons, nuclei with four neutrons but no protons. This illustration depicts the number of protons and neutrons but not their actual positions within each nucleus.

Source: APS; Credit: J. Hirshfeld

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