Carbon nanotubes with point defects produced by ionizing radiation: a study using DFTB Inés María Macías Labrada, Luis Ignacio Estévez Baños, Daniel Codorniu Pujals and Maykel Márquez Mijares Eur. Phys. J. D, 77 8 (2023) 153 Published online: 07 August 2023 DOI: 10.1140/epjd/s10053-023-00735-0