  We report an experimental investigation on the stochastic migration dynamics
of Marangoni surfers (camphor-infused paper disks) between the two lobes of a
dumbbell-shaped chamber. We characterize the migration dynamics using survival
analysis for a given configuration with a unique disk count in each lobe.
Qualitatively, all the configurations exhibit stretched exponential decay with
time, ascribed to a disk s aging. A given configuration s stability decreases
with increasing pairwise interactions. The most stable configuration is always
the one with equal partitioning of disks between the lobes, i.e., exactly
one-half of disks in each lobe for even-numbered systems but with one extra
disk in either of the lobes for odd-numbered systems. Furthermore, we model a
camphor disk as a Chiral Active Particle (CAP), as initially proposed by Cruz
et al. and show that decreasing motility (or aging) indeed causes the stretched
exponential behavior.
