On the Feasibility of Grasers
The cross section at resonance for induced gamma ray transitions in nuclear isomers would be adequate for gain if population inversion could be reconciled with recoilless (Mössbauer”) emission; the overriding consideration is inhomogeneous broadening from hyperfine interactions and isomer shifts. Feasibility of a graser in which the crystal is pumped by intense neutron burst depends upon the relative rates of isomer formation and development of lattice damage during the time required for neutron moderation and wave incubation; a major uncertainty is the isomer ratio. It appears feasible to isolate inverted populations of isomer in quantity adequate for preparing a graser by assembly after irradiation; the limiting factor will be the extent to which the recoilless line breadth can be controlled by as-yet-undemonstrated techniques. Decision on feasibility and identification of transitions suitable for either type of graser await better understanding of these factors.
KeywordsIsomer Ratio Neutron Fluences Lattice Damage Resonance Capture Neutron Moderation
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