On the Coulomb excitation of even-even nuclei in the tens of keV region for possible γ-lasing using free-electron channeling of powerful laser beams

It is suggested to use excitation of 2’+ in the multiply rotation band of even-even nuclei for hard coherent X-or soft x-rays generation. The active medium can be created by the self-channeling of powerful laser pulses in a gas of light atoms (H, He, Li, …) placed inside a metal tube of x-lasing nuclei atoms. After removing free electrons from the channel, light ions acquire energies up to several MeV, penetrate to the metal tube and excite metallic nuclei by the well-known mechanism of Coulomb collisions. Estimations for the nucleus ¹⁴⁰ce show values of x-rays increment x of up to several units per cm.