The s-wave implosion and explosion of free particles
arXiv:quant-ph/0110116
Abstract
A free quantum particle in two dimensions with vanishing angular momentum (s-wave) in the form of a ring-shaped wave packet feels an attractive force towards the center of the ring, leading first to an implosion followed by an explosion.
4 pages, 1 PS figure, submitted to Phys. Rev. Lett