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Prog. Theor. Phys. Supplement No.76 (1983) pp. 1-39

[ Full Text PDF : FREE ACCESS (3335K) ]

Fire-Balls in Pion Multiple Production

— Brasil-Japan Collaboration of Chacaltaya Emulsion Chamber Experiment —

Jose A. Chinellato,1 Carola Dobrigkeit,1 J. Bellandi Filho,1 Cesar M. G. Lattes,1 Marcio J. Menon,1 Carlos E. Navia,1 O. Ammiraju Pemmaraju,1 Kotaro Sawayanagi,1 Edison H. Shibuya,1 Armando Turtelli Jr.,1 Neuza M. Amato,2 Naoyuki Arata,2 F. M. Oliveira Castro,2 Regina H. C. Maldonado,3 Hiroshi Aoki,4 Yoichi Fujimoto,4 Shunichi Hasegawa,4 Hiroshi Semba,4 Masanobu Tamada,4 Kojiro Tanaka,4 Seibun Yamashita,4 Toru Shibata,5 Kei Yokoi,5 Hiroshi Kumano,6 Akinori Ohsawa6 and Takaaki Tabuki6

1 Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas, Campinas, S. P.
2 Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, R. J.
3 Instituto de Fisica, Universidade Federal Fluminense, Niteroi, R. J.
4 Science and Engineering Research Laboratory, Waseda University, Tokyo 162
5 Department of Physics, Aoyama Gakuin University, Tokyo 157
6 Institute for Cosmic Ray Research, University of Tokyo, Tanashi, Tokyo 188

(Received August 26, 1982; Revised February 14, 1983)

Abstract:

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 Σ Eγ > 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, pt, 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 nγ and increasing pt. Recent p-p collider experiments gave the confirming results.
From the plot of events in the diagram of nγ and <pt>, the events are classified into two types: Mirim-jets (meaning small jet, nγ = 6 ∼ 8, <pt> ∼ 140 MeV/c) and Açu-jets (large jets, nγ = 6 ∼ 8, <pt> ∼ 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 Açu-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 Açu-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 nγ and higher pt, which are called Guaçu-jets. One C-jet is found to be a candidate of this type. The Guaçu-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.


URL : http://ptp.ipap.jp/link?PTPS/76/1/
DOI : 10.1143/PTPS.76.1

[ Full Text PDF : FREE ACCESS (3335K) ] Citation:

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Citing Article(s) :

  1. Progress of Theoretical Physics Vol. 77 No. 6 (1987) pp. 1411-1433 :
    Behaviour of Cosmic Rays in the Atmosphere at Super High Energy Region
    Akinori Ohsawa and Seibun Yamashita
  2. Progress of Theoretical Physics Vol. 83 No. 1 (1990) pp. 58-76 :
    Nuclear Interactions in Super High Energy Region
    Jose Bellandi F., Sergio Q. Brunetto, Jose A. Chinellato, Carola Dobrigkeit, Akinori Ohsawa, Kotaro Sawayanagi and Edison H. Shibuya
  3. Progress of Theoretical Physics Vol. 88 No. 5 (1992) pp. 967-974 :
    Analysis of Momentum and Multiplicity Distributions for High Energy Multiparticle Production Processes Based on the Thermal Three-Cluster Model-Simulation
    Kiyoshi Kudo, Tomohiro Kiriyama, Tsuyoshi Shimada, Isami Yoneda, Takaaki Hashimoto and Ryoku Nakamura
  4. Progress of Theoretical Physics Vol. 92 No. 5 (1994) pp. 1005-1018 :
    Violation of the Feynman Scaling Law in the Forward Region
    Akinori Ohsawa
  5. Progress of Theoretical Physics Supplement No.76 (1983) pp. 51-82 :
    Analyses of C-Jets Observed by Chacaltaya Emulsion Chamber
    Hiroshi Kumano
  6. Progress of Theoretical Physics Supplement No.76 (1983) pp. 83-110 :
    Fluctuation Study of Fire-Balls with Quantized Masses
    Satoshi Kamada and Kei Yokoi

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