‎"DAVIES J. H., ET AL.‎
‎On the Masses and Modes of Decay of Heavy Mesons Produced by Cosmic Radiation. (G-Stack Collaboration).‎

‎[No place], 1955. 8vo. Without wrappers (as issued). Offprint, seperately paginated, from ""Il Nuovo Cimento"", Serie X, Vol. 2, Novembre. Very fine and clean. 41 pp + 1 blank.‎

Reference : 51351

‎Offprint of Davies' (and 36 co-authors) famous report on the G-stack experiment: how many measons excisted with a mass of about 1000 m. ""In the 1954 experiment 250 sheets of emulsion, each 37x27 and 0,6 mm thick were packed together seperately only by thin paper. The package was 15 cm thick and weighed 63 kg. It was flown over nothern Italy support by a ballon at 27 km for six hours. Because of a parachute failure on descent about 10% of the emulsion stack was damaged but the remainder was little affected. This endeavor marked the start of large collaborative efforts. In all, there were 36 authors from 10 institutions"". (Bederson, ""More Things in Heaven and Earth: A Celebration of Physics at the Millennium"").‎