Kinetic energy oscillations in annular regions of ultracold neutral plasmas S. Laha, Y. C. Chen, P. Gupta, C. E. Simien, Y. N. Martinez, P. G. Mickelson, S. B. Nagel and T. C. Killian Eur. Phys. J. D, 40 1 (2006) 51-56 Published online: 15 June 2006 DOI: 10.1140/epjd/e2006-00131-2