Experimental antiproton nuclear stopping power in ${\mathrm{H}}_2$ and ${\mathrm{D}}_2$

Data about antiprotons slowing down in gaseous targets at very low energies (E<1 keV) show that the stopping power in ${\mathrm{D}}_2$ is lower than in ${\mathrm{H}}_2$; the right way to explain this behavior seems to be through a nuclear stopping power derived from the classical Rutherford formula. © 1996 The American Physical Society.