Collisions involving positronium

Detailed investigation of low-energy positronium-hydrogen scattering

“…Positronium (Ps) scattering from atoms and molecules is an area of current experimental and theoretical interest. The development of energy-tunable ortho-Ps beams [1][2][3][4][5] has enabled measurements to be made of Ps scattering from the inert gases He, Ne, Ar, Kr, and Xe [4][5][6][7][8][9][10][11] and the molecules H 2 , N 2 , O 2 , CO 2 , H 2 O, and SF 6 [4,6,8,9,[11][12][13]. Cross sections for Ps scattering from H have not been measured due to the difficulty of creating an atomic H beam, although the binding energy of positronium hydride (PsH) has been measured in the reaction of a positron with methane, e + + CH 4 → CH + 3 + PsH [14].…”

Ionization of positronium (Ps) in collision with atom

“…3(a, b, c, d) our SDCS data using the CBA and CBOA are plotted with respect to the longitudinal energy distribution of break-up positron and electron. We compare them with the available experimental [23,24] and theoretical impulse approximation (IA) [16] data at different incident energies e.g. 18 eV, 25 eV, 33 eV and 60 eV.…”

“…But at lower incident energies since the projectile interacts with target field for a longer period, the electron-electron correlation between the target electrons can influence the result. We present the singly (energy) differential (SDCS) as well as total Ps-ionization cross sections (TCS) in PsHe scattering using the Coulomb-Born-Oppenheimer approximation (CBOA), the Coulomb-Born approximation (CBA), the first-Born approximation (FBA), the first BornOppenheimer approximation (BOA) and compare them with the available experimental [22][23][24] and theoretical data. We also present the theoretical TCS data for Ps-H system.…”

Directed fluxes of positronium using pulsed travelling optical lattices

“…[10][11][12][13][14][15] for work on Ps-atom/molecule total scattering cross sections and [16] for a study of fragmentation.) Reviews of some of this work can be found in [17,18].…”