Extended Data Fig. 2: Simulated spatial distributions of antiprotons and the temperature in the He I target.
From: High-resolution laser resonances of antiprotonic helium in superfluid 4He
a, Spatial distribution of antiprotons that come to rest in the He I target calculated by a GEANT4 Monte Carlo simulation (not to scale). b, Spatial distribution of temperature in the He I target prior to the arrival of the laser pulse, simulated by COMSOL. In the portion of the target where the \(\bar{p}{{\rm{H}}{\rm{e}}}^{+}\) atoms were formed, the laser pulse arriving 119 s earlier is estimated to increase the temperature of the He I by not more than 4 mK.
