Laser-excited gamma source with high spectral brightness

This paper considers various channels of y-quantum generation via an ultra-short high-power laser pulseinteraction with different targets.We analyse the possibilities to create a pulsed y - radiation source usinglaser triggering of some nuclear reactions and isomer targets. It is shown that 0.2 MeV monochromaticshort pulse ofy - radiation can be obtained with pulse energy sub-mJ level from isomer atoms localizedin a magnetic trap. For nuclear reaction channel in light- atom materials, it is shown that 100-TW laserpulse gives rise to formation of about io6 photons near 5 MeV energy. 1. Introduction To date, many physical problems call for using a sources of'y -radiation and vast scope of theseproblems ranging from non destructive gamma flaw detection to medical examinations[1I. It should benoted that, presently, the intensity of ordinary radioactive sources cannot be higher than 10-100 GBk,whereas much higher intensity is necessary for many investigations.Commonly, synchrotron radiation is used as a high-intensity y -source, its activity being about PBk.However, significant success notwithstanding, the use ofthe synchrotron radiation as a y -sourcefeatures some essential drawbacks. First, it is impossible to obtain the high intensity 'y -radiation in verynarrow frequency range, because the synchrotron radiation spectrum is continuous. Hence narrow-frequency-band experiments with a high-power y -source appear to be impossible, because the power of