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The impact of radiation reaction and Breit-Wheeler pair production onacceleration of fully ionized Carbon ions driven by an intenselinearly-polarized laser pulse has been investigated in the ultra-relativistictransparency regime. Against initial expectations radiation reaction and pairproduction at ultra-high laser intensities is found to enhance the energygained by the ions. The electrons lose most of their transverse momentum andthe additionally produced pair plasma of Breit-Wheeler electrons and positronsco-stream in the forward direction as opposed to the existing electronsstreaming at an angle above zero. We discuss how these observations could beexplained by the changes in the phase velocity of the Buneman instability, thatis known to aid ion acceleration in the Breakout-Afterburner regime, by tappingthe free energy in the relative electron and ion streams. We present evidencethat these non-classical effects can further improve the highest Carbon ionenergies in this transparency regime.

Energy enhancement of laser-driven ions by radiation reaction and Breit-Wheeler pair production in the ultra-relativistic transparency regime