ANALYSIS OF POSITRON-HYDROGEN COLLISIONS USING EFFECTIVE RANGE THEORIES
S. J. Ward$^{+,*}$ and J. H. Macek$^\dagger$
$^+$ Department of Physics, University of North Texas, Denton, Texas
76203, USA
* Present Address ITAMP
$^\dagger$ Department of Physics and Astronomy,
University of Tennessee, Knoxville,
Tennessee 37996, USA and Oak Ridge National Laboratory, 
Oak Ridge, Tennessee 37831, USA
We have used two different effective range theories to analyze
variational results for positron-hydrogen collisions in the Ore gap.
The effective range theories explicitly include the polarization
potential in the positronium-proton channel.