Target Structure Induced Suppression of the Ionization Cross Section for Very Low Energy Antiproton-Hydrogen Collisions

H. Knudsen, H.A. Torii, M. Charlton, Y. Enomoto, I. Georgescu, Christopher Hunniford, C.H. Kim, Y. Kanai, H.P.E. Kristiansen, N. Kuroda, M.D. Lund, Robert McCullough, K. Tokesi, U.I. Uggerhoj, Y. Yamazaki

Research output: Contribution to journalArticle

18 Citations (Scopus)

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 2-11 keV, i.e., in the velocity interval of 0.3-0.65 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.
Original languageEnglish
Article number213201
JournalPhysical Review Letters
Volume105
Issue number21
DOIs
Publication statusPublished - 17 Nov 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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