Progress toward the long time confinement of large positron numbers C.J. Baker, J. Jennings, A. Verma, J. Xu, M.H. Weber and K.G. Lynn Eur. Phys. J. D, 66 4 (2012) 109 Published online: 30 April 2012 DOI: 10.1140/epjd/e2012-20631-6