Do the Solitary Cooled-Down Neutron Stars Spontaneously Disintegrate?
  We discuss the possibility for a cooled down and otherwise stable solitary neutron star to make a spontaneous transition to its potential black hole ground state. This fundamental process would mimic a precursorless explosion in which the emitted radiations consisting of the statistical mass spectrum of high-energy neutron-rich nuclei, gamma rays and (anti) neutrinos, would carry away some mass of the star, leaving behind the core of the star in the form of a black hole. 
Ivan V. Anicin