Noun
dineutron (plural dineutrons)
A particle consisting of two neutrons.
In 2012, Artemis Spyrou from Michigan State University and coworkers reported that they observed, for the first time, the dineutron emission in the decay of 16 Be. Source: Internet
There had been evidence of dineutron emission from neutron-rich isotopes such as beryllium -16 where mononeutron decay would result in a less stable isotope. Source: Internet