TY - JOUR
T1 - Target Structure Induced Suppression of the Ionization Cross Section for Very Low Energy Antiproton-Hydrogen Collisions
AU - Knudsen, H.
AU - Torii, H.A.
AU - Charlton, M.
AU - Enomoto, Y.
AU - Georgescu, I.
AU - Hunniford, Christopher
AU - Kim, C.H.
AU - Kanai, Y.
AU - Kristiansen, H.P.E.
AU - Kuroda, N.
AU - Lund, M.D.
AU - McCullough, Robert
AU - Tokesi, K.
AU - Uggerhoj, U.I.
AU - Yamazaki, Y.
PY - 2010/11/17
Y1 - 2010/11/17
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevLett.105.213201
DO - 10.1103/PhysRevLett.105.213201
M3 - Article
SN - 0031-9007
VL - 105
JO - Physical Review Letters
JF - Physical Review Letters
IS - 21
M1 - 213201
ER -