Cosmic gamma lasers (hypotheses and estimations)

The presence of a very weak negative absorption in solar and galactic discrete γ-lines of nuclear transitions and in the line of radiation neutron capture with a proton is shown. The estimations show the possibility of existence of a local zone ΔR approximately 104 cm deep with the volume of ΔRΔS <=1011 cm3 near the star surface, where the inversion of population of states of electron positron continuum and a high photon filling of field oscillators take place. This proves the hypothesis on the stimulated nature of emitting discrete annihilation line with the 0531+21 PSR pulsar. Such stimulated process is responsible for both high radiance, radiation directivity and for narrowing gamma lines, as compared with Doppler width