The carbon-based structures synthesized through nuclear reactions in helium at 1.1 kbar pressure under irradiation with braking γ-rays of 10 MeV threshold energyA. Yu. Didyk, R. Wisniewski and T. Wilczynska-KitowskaEPL, 109 2 (2015) 22001DOI: https://doi.org/10.1209/0295-5075/109/22001