I was thinking some more about the right conditions to promote nuclear fusion with a hydrogen molecule and a di-neutron. It seems to me that you would want the hydrogen molecule to be intact rather than split into individual atoms. Then you would want some way of aligning the axis of rotation of the di-neutron with the hydrogen molecule and sufficient pressure to cause the di-neutron to pass between the electrons. So maybe we need pressure and a strong uniform magnetic field but relatively low temperature.

Thinking of the hydrogen bond as caused by the repulsion of the shell electrons into the remote hemisphere this could create an electrically neutral region between the protons which might allow a slow moving di-neutron to be placed close enough to the protons for the "strong nuclear force" to take effect. There would be no "run away" nuclear reaction because there are no products of the fusion except energy. The reaction could be controlled just by the availability of the hydrogen or di-neutrons.

I think it is worth a try because if it works it might produce the possibility of nuclear fusion at a much lower temperature and might be scaleable to quite small configurations.

This whole approach depends on the Spacetime Wave theory view of the nature of the proton, electron and neutron:

Preprint The Space Time Wave Theory (August 2021)

Preprint The Unification of Physics (June 2021)

Data Prerecording of Conference Presentation on the Unification of Physics

Richard