  In this work we propose a new mechanism for photoproduction inside a neutron
star based on Parametric Resonance phenomenon as firstly applied to
Inflationary Cosmology. Our assumptions are based on the pion condensation
model by Harrington and Shepard. We show that a huge number of photons are
created which, on turns, reheats the matter in the star's core. Thus, we argue
that Parametric Resonance can be effective during a brief period out of an
neutron star lifetime leading to an anomalous uprising variation of its
brightness departing from the black body radiation at regularly spaced
frequencies. In adition, a time periodic signal is obtained in moderate (not
exponential) regimes. We argue also that our PR mechanism offers a simple and
feasible explanation for some recent observations of giant flares from neutron
stars.
