Summary
Elastic and inelastic 19.8 GeV/c proton-proton collisions in nuclear emulsion are examined using an external proton beam of the CERN Proton Synchrotron. Multiple scattering, blob density, range and angle measurements give the momentum spectra and angular distributions of secondary protons and pions. The partial cross-sections corresponding to inelastic interactions having two, four, six, eight, ten and twelve charged secondaries are found to be, respectively, (16.3±8.4) mb, (11.5 ± 6.0) mb, (4.3 ± 2.5) mb, (1.9 ± 1.3) mb, (0.5 ± 0.5) mb and (0.5±0.5)mb. The elastic cross-section is estimated to be (4.3±2.5) mb. The mean charged meson multiplicity for inelastic events is 3.7±0.5 and the average degree of inelasticity is 0.35±0.09. Strong forward and backward peaking is observed in the center-of-mass system for both secondary charged pions and protons. Distributions of energy, momentum and transverse momentum for identified charged secondaries are presented and compared with the results of work at other energies and with the results of a statistical theory of proton-proton collisions.
Riassunto
Per mezzo di un fascio esterno di protoni del fotosincrotrone del CERN si sono esaminate le collisioni protone-protone di 19.8 GeV/c elastiche ed anelastiche. Lo scattering multiplo, la densità di blob, le misure del percorso e dell’angolo danno gli spettri degli impulsi e le distribuzioni angolari dei protoni e pioni secondari. Si è trovato che le sezioni d’urto parziali corrispondenti ad interazioni elastiche aventi due, quattro, sei, otto, dieci e dodici secondari carichi sono, rispettivamente, (16.3±8.4) mb, (11.5±6.0) mb, (4.3±2.5) mb, (1.9± 1.3) mb, (0.5±0.5) mb e (0.5±0.5) mb. La sezione d’urto elastica si valuta in (4.3±2.5) mb. La molteplicità media dei mesoni carichi per eventi anelastici è 3.7±0.5 e il grado medio di anelasticità è 0.35±0.09. Si osservano forti picchi in avanti ed all’mdietro sia per i pioni che per i protoni secondari carichi. Si danno le distribuzioni dell’energia, dell’impulso e dell’impulso trasversale per i secondari carichi identificati e si confrontano con i risultati dei lavori ad altre energie e coi risultati di una teoria statistica delle collisioni protone-protone.
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Abraham, F.F., Kalbach, R.M. Proton-proton collisions at 19.8 GeV/c. Nuovo Cim 26, 717–728 (1962). https://doi.org/10.1007/BF02781797
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DOI: https://doi.org/10.1007/BF02781797