Annihilation Lines 255.5 and 511 keV in theRadiation Spectrum from the Pulsar Polar Cap

摘要

We consider the formation of lines 255.5 keV and 511 keV due to annihilation of fast positrons from the pulsar vacuum gap with slow electrons of the neutron star surface. The weak line 255.5 keV can be detected by observing the opposite (to the positron stream) radiation in the laboratory experiment.