Fragmentation of positronium in collision with He atoms.
The absolute cross section for the fragmentation of positronium in collision with He atoms has been measured. The results are compared with available theories. The longitudinal energy distributions of positrons resulting from fragmentation have also been determined and are found to display a peak situated just below half the residual energy. This is suggestive of the occurrence of "electron loss to the continuum" in which the two residual charged particles lie in a low relative-velocity Coulomb-continuum state.
Armitage
S
S
Department of Physics and Astronomy, University College London, Gower Street, London, WCIE 6BT.
Leslie
D E
DE
Garner
A J
AJ
Laricchia
G
G