Downconverting gamma rays

You could charge up nuclear shells with gamma rays, and get a pulsed mixer by putting the shells in a glancing geometry to get high effective cross sections. I'm not sure if quantum nucleonics is predictive enough to do the design. This is a gamma ray laser, of course. I'm not sure where the pumping gammas are going to come from. Probably sideways from the tuned axis. Maybe a high-fluence reactor could pump it. Nuclear explosives certainly could.
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