  We study the properties of the transition probability for a circularly
accelerated detector which interacts with the massless scalar fields in the
presence of a reflecting boundary. As trajectory radius increases, the
transition probability may exist some peaks in special circumstances, which
lead to the possibility of same result for different trajectory radius with the
same acceleration and energy gap. These behaviors can be characterized by some
critical values. Furthermore, we analyze the entanglement harvesting phenomenon
for two circularly accelerated detectors with a boundary. We consider that the
two detectors are rotating around a common axis with the same acceleration,
trajectory radius and angular velocity. When the detectors are close to the
boundary, there may exist two peaks for entanglement harvesting. Interestingly,
as trajectory radius increases, entanglement harvesting in some situations
first decreases to zero, then maintains zero, and finally increases to a stable
value. For a small energy gap, as the distance between the two detectors
increases, the entanglement harvesting first takes zero at a larger distance
between detectors and the boundary.
