Absolute cross section for positron-impact ionization of hydrogen near threshold
- University of North Texas
- ORNL
We investigate positron-impact ionization of hydrogen near threshold using the hyperspherical hidden crossing method (HHCM). Previously, Ihra et al. Phys. Rev. Lett. 78 4027 (1997) used the HHCM to obtain the extended Wannier threshold law for zero angular momentum. We extend their analysis to higher angular momentum L and show that the extended Wannier threshold law is L independent. We also calculate the absolute partial-wave ionization cross sections for L=0, 1, 2, and 3 and compare our results with other calculations and with experimental measurements. The HHCM calculation provides an explanation for the very small S-wave and large D-wave contributions to the ionization cross section in terms of destructive and constructive interference, respectively.
- Research Organization:
- Oak Ridge National Laboratory (ORNL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1036661
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 2 Vol. 79; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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