  Acoustic shock waves passing through colliding cold neutron stars can cause
repetitive superconducting phase transitions in which the proton condensate
relaxes to its equilibrium value via coherent oscillations. As a result, a
resonant non-thermal production of gamma rays in the MeV energy range with
power up to 10^(52) erg/s can take place during the short period of time before
the nuclear matter is heated by the shock waves.
