Capture of slow antiprotons by helium atoms
Research Institute for Particle and Nuclear Physics, P.O.B. 49, 1525 Budapest, Hungary
2 Joint Institute for Nuclear Research, Dubna 141980, Russia
Corresponding author: a email@example.com
Published online: 4 October 2005
A consistent quantum mechanical calculation of partial cross-sections leading to different final states of antiprotonic helium atom was performed. For the four-body scattering wave function, corresponding to the initial state, as well as for the antiprotonic helium wave function, appearing in the final state, adiabatic approximations were used. Further, symmetric and non-symmetric effective charge (SEC, NEC) approximations were introduced for the two-electron wave functions in the field of the two fixed charges of the He nucleus and the antiproton. Calculations were carried out for a wide range of antiprotonic helium states and incident energies of the antiproton below the first ionization threshold of the He atom. The origin of the rich low-energy structure of certain cross-sections is discussed in detail.
PACS: 36.10.-k – Exotic atoms and molecules (containing mesons, muons, and other unusual particles) / 25.43.+t – Antiproton-induced reactions / 34.90.+q – Other topics in atomic and molecular collision processes and interactions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005