The two-proton shell gap in Sn isotopes P. Fleischer, P. Klüpfel, T. Cornelius, T. J. Bürvenich, S. Schramm, J. A. Maruhn and P. -G. Reinhard Eur. Phys. J. A, 22 3 (2004) 363-370 Published online: 16 November 2004 DOI: 10.1140/epja/i2004-10054-4