4-neutron nucleus

Researchers in Japan claim to have discovered a neutral nucleus of an atom containing only 4 neutrons. They fired neutron-rich helium nuclei (two protons, six neutrons) at liquid helium (two protons, two neutrons) and the reaction sometimes produced a beryllium nuclei (four protons, four neutrons) leaving a neutron quartet! This four-neutron nuclei lasted about a billionth of a trillionth of a second before decaying! Not very stable then! 



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