Neutronium#Neutronium and the periodic table

Dineutron (nn)

The Dineutron is a hypothetical particle consisting of two neutrons. There is probably an intermediate state in reactions involving a Triton is involved. The Dineutron itself is not bound, even when you know from the analysis of scattering lengths that the potential has appealing character. The explanation that the particle is not bound is to look like the di-proton in a combination of Pauli principle and the strong spin -spin coupling in nuclei.

In the series of neutron cluster is the Dineutron the smallest representative. The only known bound state of this series is the neutron star. Here but not nuclear power, but the gravity of the bond is unlike the Dineutron responsible. There are also controversial experimental evidence for a bound Tetraneutron.

• Nuclear physics