Some characteristics of inelastic proton-nucleon collisions produced by protons of energy 6.2 GeV in nuclear emulsions

SummaryNuclear interactions produced by protons of energy 6.2 GeV in nuclear emulsions have been analysed to deduce information regarding some of the characteristics of proton-nucleon collisions. 703 disintegrations have been obtained by « along the track » scanning. Accurate measurements of multiple scattering and of grain density have been made on favourable tracks of relativistic secondary particles; using these measurements it has been possible to identify the particles up to the highest energies involved. It is found from this investigation that in collisions of protons of energy 6.2 GeV with nucleons:a) the mean charged pion multiplicity is 1.51±0.18;b) the mean inelasticity is 0.43, and is, within errors, independent of the total multiplicityns;c) the nucleons recoiling in the C.M. system are very strongly collimated symmetrically in the forward and backward directions;d) the mesons created in the collision also show an appreciable amount of forward-backward collimation in the C.M. system.RiassuntoSi sono studiate le interazioni nucleari prodotte da protoni di energia 6.2 GeV nelle emulsioni nucleari per dedurre informazioni concernenti alcune delle caratteristiche delle collisioni protone-nucleone. Si sono rilevate 703 disintegrazioni con lo scanning « lungo la traccia ». Si sono eseguite accurate misure dello scattering multiplo e della densità di grani su opportune tracce di particelle relativistiche secondarie; con l’uso di queste misure è stato possibile identificare le particelle sino alle più elevate energie coinvolte. In questo studio si è trovato che in collisioni di protoni di energia di 6.2 GeV con nucleoni:a) la molteplicità media del pione carico è 1.51±0.18;b) l’anelasticità media è 0.43, ed è, entro i limiti d’errore, indipendente dalla molteplicità totalens;c) i nucleoni che rinculano nel sistema del C.M. sono fortissimamente collimati nelle direzioni anteriore e posteriore;d) i mesoni creati nella collisione presentano pure un’apprezzabile collimazione antero-posteriore nel sistema del C.M.

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