Antiproton stopping inH2andH2O

Abstract

Stopping powers of antiprotons in ${\text{H}}_{2}$ and ${\text{H}}_{2}\text{O}$ targets are calculated using a semiclassical time-dependent convergent close-coupling method. In our approach the ${\text{H}}_{2}$ target is treated using a two-center molecular multiconfiguration approximation, which fully accounts for the electron-electron correlation. Double-ionization and dissociative ionization channels are taken into account using an independent-event model. The vibrational excitation and nuclear scattering contributions are also included. The ${\text{H}}_{2}\text{O}$ target is treated using a neonization method proposed by C. C. Montanari and J. E. Miraglia [J. Phys. B 47, 015201 (2014)], whereby the ten-electron water molecule is described as a dressed Ne-like atom in a pseudospherical potential. Despite being the most comprehensive approach to date, the results obtained for ${\text{H}}_{2}$ only qualitatively agree with the available experimental measurements.