  The inherently unstable nature of domain walls makes their detection in
laboratory experiments extremely challenging. We propose a method to stabilise
domain walls in a particular modified gravity model inside a cavity. We suggest
two ways in which the walls could be detected once stabilized: studying the
trajectories of Ultra Cold Neutrons (UCN's) either via the deflection angle of
a neutron beam induced by the attraction towards the wall or through the time
difference of these particles passing through the wall. We give realistic
estimates for these effects and expect that they should be detectable
experimentally.
