A. Bonetti and M. Mazzoni – The Arcetri School of Physics ...... 3 M. C. Bustamante – Giuseppe Occhialini and the history of cosmic-ray physics in the 1930s: From Florence to Cambridge ...... 35 A. M. Ribeiro de Andrade – Occhialini’s trajectory in Latin America ...... 51 L. Gariboldi – Occhialini’s scientific production between the two English periods 71 W. O. Lock and L. Gariboldi – Occhialini’s contribution to the discovery of the pion. An interview by L. Gariboldi ...... 79 A. Bonetti and L. Gariboldi – Occhialini and the Université Libre de Bruxelles. An interview by L. Gariboldi ...... 93 R. Levi-Setti – Elementary-particle physics at the University of Milan 1951-1956 107 G. Vegni – Giuseppe Occhialini in Milan in the sixties and beyond: His legacy for particle physics and his influence on young researchers and students ...... 115 E. Quercigh – Giuseppe Occhialini and CERN ...... 129 G. Sironi – 1960-1970: Milano and Gruppo Spazio ...... 133 B. Agrinier, L. Koch-Miramond and J. Paul – La Collaboration Milano - Saclay - Palermo ...... 141 L. Scarsi – Beppo Occhialini and the birth of Space Physics in Italy and in Europe: Personal memories ...... 151 G. C. Perola – An Italian school of high-energy astrophysics: A personal view from the sixties to Beppo-SAX ...... 173 G. Boella – Beppo and space research in Italy ...... 195 G. E. Villa – Brief summary of the LFCTR/IFCTR history ...... 199

VII VIII Present day perspectives in research fields pioneered by Occhialini

D. H. Perkins – Are diamonds for ever, or do protons decay? A tale of the unex- pected ...... 209 A. Bertin, P. Faccioli and A. Vitale – Present appeal in pion decay studies and applications ...... 223 G. Gavazzi – On the origin of cosmic-ray electrons ...... 235 L. Maraschi and A. Treves – Perspectives of high-energy astrophysics ...... 241

Personal Reminiscences

B. Stiller – Personal remembrances ...... 251 R. Levi-Setti – Working with Beppo: Personal recollections ...... 259 S. P. Ratti – G. P. S. Occhialini: One of my masters ...... 263 J. Labeyrie – G. P. S. Occhialini vu par un de ses amis ...... 277 J. Bland – Early cosmic-ray experiments on ESRO satellites - Some memories of via Celoria ...... 283 M. J. L. Turner – Beppo Memoire. Space in late ’60s Milan ...... 289 A. J. Dean – Beppo and the road to INTEGRAL ...... 291

Appendices

List of scientiﬁc publications of G. Occhialini ...... 303 Scientiﬁc and Editorial Boards ...... 309 ListofAuthors ...... 310