TY - GEN
T1 - On the double ionization of helium by very slow antiproton impact
AU - Knudsen, H.
AU - Kristiansen, H. P. E.
AU - Thomsen, H. D.
AU - Andersen, Hans Henrik
N1 - Conference on elementary processes in atomic systems, 4, 18-20 Juni, 2008, Cluj Napoca, Romania
PY - 2009/1
Y1 - 2009/1
N2 - Here we present experimental information on the cross section for double ionization of helium atoms by slow antiproton impact. It is used to discern between many advanced theoretical calculations. Earlier measurements of the ratio R between the double and single ionization cross sections for antiproton impact on helium show a persistent increase for the projectile energy decreasing from 10 MeV to 10 keV. The present data show that below 10 keV this increase stops and we give an upper limit to R.
AB - Here we present experimental information on the cross section for double ionization of helium atoms by slow antiproton impact. It is used to discern between many advanced theoretical calculations. Earlier measurements of the ratio R between the double and single ionization cross sections for antiproton impact on helium show a persistent increase for the projectile energy decreasing from 10 MeV to 10 keV. The present data show that below 10 keV this increase stops and we give an upper limit to R.
U2 - 10.1016/j.nimb.2008.10.070
DO - 10.1016/j.nimb.2008.10.070
M3 - Conference article
SN - 0168-583X
VL - 267
SP - 244
EP - 247
JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
IS - 2
ER -