Fire-Balls in Pion Multiple Production : Brasil-Japan Collaboration of Chacaltaya Emulsion Chamber Experiment

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The article describes a study of the multiple pion production through observation of gamma-rays produced by nuclear interactions at the target layer of the emulsion chambers exposed at Chacaltaya, Bolivia, 5200 m above sea level. The analysis was focused on 80 events with ΣE_γ>20 TeV, well above the detection threshold of the X-ray film spot scanning, ~3 TeV. The distribution of gamma-rays is constructed on their energy, P_t, and emission angle, and the comparison is made with the results from the simulation calculations based on FNAL hydrogen bubble chamber events and ISR minimum bias events. The cosmic-ray results are significantly out of the simple scaling extrapolation, showing higher rapidity density n_γ and increasing P_t・ Recent p^^--p collider experiments gave the confirming results. From the plot of events in the diagram of n_γ and <Pt>, the events are classified into two types; Mirim-jets (meaning small jets, n_γ=2~3, <P_t>~140 MeV/c) and Acu-jets (large jets, n_γ=6~8, <P_t>~220 MeV/c), with nearly equal frequency of production. Mirim-jets are those on the scaling extrapolation from the lower energy region of accelerators, while increasing rate of Acu-jets with energy is causing the scaling break. The analysis with the fire-ball model shows that the Mirim-jets are consistently interpreted as production and decay of a small fire-ball (a fire-ball quantum called H-quantum) with rest energy of 2~3 GeV and decay temperature of about 130 MeV. While, the Acu-jets necessitate introduction of a heavy fire-ball (SH-quantum) with rest energy of 20~30 GeV. The study of atmospheric interactions (A-jets) shows presence of events with still larger n_γ and higher Pt which are called Guacu-jets. The Guacu-jets require presence of a huge fire-ball (UH-quantum) of rest energy 200~300 GeV. Discussions are made on physical implication of the fire-ball model,particularly on those quanta of a fire-ball.
理論物理学刊行会の論文
1983-11-21

Fire-Balls in Pion Multiple Production : Brasil-Japan Collaboration of Chacaltaya Emulsion Chamber Experiment

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