  A new method for generation of quasimonoenergetic and low emittance fast
ion/nuclei bunches of solid densities from nanotargets by two
counterpropagating laser pulses of ultrarelativistic intensities is proposed,
based on the threshold phenomenon of particles "reflection" due to induced
nonlinear Compton scattering. Particularly, a setup is considered which
provides generation of ion bunches with parameters that are required in hadron
therapy.
