Pre-scission configuration of the tri-nuclear system at spontaneous ternary fission of 252Cf A. K. Nasirov, R. B. Tashkhodjaev and W. von Oertzen Eur. Phys. J. A, 52 5 (2016) 135 Published online: 23 May 2016 DOI: 10.1140/epja/i2016-16135-9