Fig. 3.
Time distributions of positrons in the entire target region and in each of three vacuum regions, for flat aerogel (open circles) and laser-ablated aerogel with pitch of 300 |$\mu $|m (closed circles). No background has been subtracted.
Time distributions of positrons in the entire target region and in each of three vacuum regions, for flat aerogel (open circles) and laser-ablated aerogel with pitch of 300 |$\mu $|m (closed circles). No background has been subtracted.
