TY - JOUR
T1 - Coupling between positron-atom scattering channels above the first inelastic threshold
AU - Coleman, Paul G
AU - Cheesman, N
AU - Lowry, E R
PY - 2009/5/1
Y1 - 2009/5/1
N2 - Experimentally determined cross sections for the elastic scattering of positrons by argon and xenon atoms have been found to exhibit a steplike increase at the first inelastic threshold energy-i.e., that for positronium formation. Rather than supporting the existence of a cusplike behavior predicted theoretically, this feature, which is more pronounced for xenon, suggests the existence of an intermediate virtual positronium state which enhances the elastic interaction probability.
AB - Experimentally determined cross sections for the elastic scattering of positrons by argon and xenon atoms have been found to exhibit a steplike increase at the first inelastic threshold energy-i.e., that for positronium formation. Rather than supporting the existence of a cusplike behavior predicted theoretically, this feature, which is more pronounced for xenon, suggests the existence of an intermediate virtual positronium state which enhances the elastic interaction probability.
UR - http://www.scopus.com/inward/record.url?scp=67650311531&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1103/PhysRevLett.102.173201
U2 - 10.1103/PhysRevLett.102.173201
DO - 10.1103/PhysRevLett.102.173201
M3 - Article
SN - 0031-9007
VL - 102
JO - Physical Review Letters
JF - Physical Review Letters
IS - 17
M1 - 173201
ER -