Obstacles K and L in IR (d ≥ 2) are considered that are finite disjoint unions of strictly convex domains with C boundaries. We show that if K and L have (almost) the same scattering length spectrum, or (almost) the same travelling times, then K = L.

@inproceedings{Noakes2014RigidityOS,
title={Rigidity of Scattering Lengths and Travelling Times for Disjoint Unions of Convex Bodies},
author={Lyle Noakes and Luchezar Stoyanov},
year={2014}
}