Target Structure Induced Suppression of the Ionization Cross Section for Very Low Energy Antiproton-Hydrogen Collisions
Authors:
- H. KnudsenHKH. Knudsen
- H. A. ToriiHTH. A. Torii
- M. CharltonMCM. Charlton
- Y. EnomotoYEY. Enomoto
- I. GeorgescuIGI. Georgescu
- C. A. HunnifordCHC. A. Hunniford
- C. H. KimCKC. H. Kim
- Y. KanaiYKY. Kanai
- H.-P. E. KristiansenHKH.-P. E. Kristiansen
- N. KurodaNKN. Kuroda
- M. D. LundMLM. D. Lund
- R. W. McCulloughRMR. W. McCullough
- 17 November 2010
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 105 (21) , 213201
Abstract
Low energy antiprotons have been used previously to give benchmark data for theories of atomic collisions. Here we present measurements of the cross section for single, nondissociative ionization of molecular hydrogen for impact of antiprotons with kinetic energies in the range 2\char21{}11~keV, i.e., in the velocity interval of 0.3\char21{}0.65~a.u. We find a cross section which is proportional to the projectile velocity, which is quite unlike the behavior of corresponding atomic cross sections, and which has never previously been observed experimentally.Keywords
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