MODERN PROBLEMS OF NUCLEAR ENERGY AND NUCLEAR TECHNOLOGIES

State-selective electron-capture and ionisation in collisions of fully stripped and hydrogen-like oxygen ions with hydrogen

Not scheduled

20m

Institute of Nuclear Physics

Poster Theoretical and experimental physics

Speaker

Prof. Alisher Kadyrov (Curtin University and Institute of Nuclear Physics Academy of Sciences Republic of Uzbekistan)

Description

The study of collisions involving highly charged ions and atoms has important applications in astrophysics and fusion plasma modelling. In astrophysical research, data on ion-atom collisions is required for studying interactions of atoms in the tails of comets with solar wind ions. Measurements of the spectral lines from these comets correspond to transitions in highly charged ions of carbon, nitrogen and oxygen [1]. Notably, O$^{7+}$ and O$^{8+}-$H$(1s)$ collisions contribute significantly to the observed spectra. We employ the two-centre wave-packet convergent close-coupling (WP-CCC) method [2] to model ionisation and electron capture processes occurring in collisions of these ions with atomic hydrogen. We account for the interactions with the hydrogen-like oxygen ion using a model potential and the parameters for the potential are obtained using a new method. This method provides accurate orbital energies for the outgoing He-like ion formed by electron capture.

The total and state-selective electron-capture, and total ionisation cross sections have been calculated. The experimental data by Panov et al. [3] is smaller than the measurements by Meyer et al. [4]. The results by Panov et al. [3] also display a large variance as a function of the projectile energy, whereas the latter are fairly constant over the same energy range. Our calculations are in excellent agreement with the measurements by Meyer et al. [4]. The WP-CCC results, available in a wide energy range, are also in good agreement with other theoretical calculations that are limited to either low or intermediate energies. Having validated the method, we can use it to generate data on state-selective capture cross sections. Such results, as well as the ionisation cross sections [5] will be presented.

References
[1] R. T. Zhang, T. Liao, C. J. Zhang, L. P. Zou, D. L. Guo, Y. Gao, L. Y. Gu, X. L. Zhu, S. F. Zhang, and X. Ma, Mon. Not. R. Astron. Soc. 520, 1417 (2023).
[2] N. W. Antonio, C. T. Plowman, I. B. Abdurakhmanov, and A. S. Kadyrov, Phys. Rev. A 109, 012817 (2024).
[3] M. N. Panov, A. A. Basalaev, and K. O. Lozhkin, Phys. Scr. T3, 124 (1983).
[4] F. W. Meyer, A. M. Howald, C. C. Havener, and R. A. Phaneuf, Phys. Rev. A 32, 3310 (1985).
[5] A. M. Kotian, N. W. Antonio, and A. S. Kadyrov, Phys. Rev. A 112, 012806 (2025).