The Nuclear Cycle that Powers the Stars: Fusion, Gravitational Collapse   and Dissociation
  The finding of an unexpectedly large source of energy from repulsive interactions between neutrons in the 2,850 known nuclides has challenged the assumption that H-fusion is the main source of energy that powers the Sun and other stars. Neutron repulsion in compact objects produced by the collapse of stars and collisions between galaxies may power more energetic cosmological events (quasars, gamma ray bursts, and active galactic centers) that had been attributed to black holes before neutron repulsion was recognized. On a cosmological scale, nuclear matter cycles between fusion, gravitational collapse, and dissociation (including neutron emission) rather than evolve in one direction by fusion. The similarity Bohr noted between atomic and planetary structures may extend to a similarity nuclear and stellar structures. 
O. Manuel, Michael Mozina, Hilton Ratcliffe