Stopping power of antiprotons in H, H2, and He targets

Abstract

The stopping power of antiprotons in atomic and molecular hydrogen as well as helium was calculated in an impact-energy range from 1 keV to 6.4 MeV. In the case of H2 and He the targets were described with a single-active electron model centered on the target. The collision process was treated with the close-coupling formulation of the impact-parameter method. An extensive comparison of the present results with theoretical and experimental literature data was performed in order to evaluate which of the partly disagreeing theoretical and experimental data are most reliable. Furthermore, the size of the corrections to the first-order stopping number, the average energy transferred to the target electrons, and the relative importance of the excitation and the ionization process for the energy loss of the projectile was determined. Finally, the stopping power of the H, H2, and He targets were directly compared revealing specific similarities and differences of the three targets.

v1: 12 pages, 8 figures, and 1 table v2: 15 pages, 9 figures, and 2 tables; extended discussion on IPM in Method; influence of double ionization on stopping power discussed in Results

References in corpus (6)

• Fully Correlated Electronic Dynamics for Antiproton Impact Ionization of Helium
• Ionisation of hydrogen molecule in intense ultrashort laser pulses: parallel versus perpendicular orientation
• A simple parameter-free one-center model potential for an effective one-electron description of molecular hydrogen
• Antiproton and proton collisions with the alkali metal atoms Li, Na, and K
• Antiproton collisions with molecular hydrogen
• Experimental evidence of antiproton reflection by a solid surface

Cited by in corpus (6)

• Calculation of transition probabilities and ac Stark shifts in two-photon laser transitions of antiprotonic helium
• Ionization of molecular hydrogen and deuterium by a frequency-doubled Ti:sapphire laser pulses
• Full two-electron calculations of antiproton collisions with molecular hydrogen
• Electron correlations in the antiproton energy loss distribution in He
• Collisions of antiprotons with hydrogen molecular ions
• Calculation of Energy Loss in Antiproton Collisions with Many-Electron Systems using Ehrenfest's Theorem