The momentum of all charged mesons produced in 19 high energy, high multiplicity nucleus-nucleus collisions of cosmic rays in emulsion have been measured. The transverse momentum distribution differs qualitatively from proton-proton collisions at comparable energies. One possible interpretation is in terms of a transverse explosion with effective temperature T=78 MeV and transverse flow velocity υ=0.61c.
Bibliographical noteFunding Information:
We thank Mary Olson and Hllde Rahlenbeckfo r their careful measurementosf the interactionsT his work was supportedb y the US Departmenot f Energy under contractD OE/DE-AC02-79ER1-0364,t he US National Scmnce Foundation grant No PHY 8405852a nd NASA grant No NGR 24-005-050