Analyses of C-Jets Observed by Chacaltaya Emulsion Chamber

Kumano, H.

doi:10.1143/ptps.76.51

Prog. Theor. Phys. Suppl.

1983

DOI: 10.1143/ptps.76.51

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Analyses of C-Jets Observed by Chacaltaya Emulsion Chamber

H. Kumano¹

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Cited by 4 publications

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“…The pseudo-rapidity density distribution by the experiments shows a shallow dip around η = 0 with the center of the dip at η = 0, which indicates that the rapidity density distribution is flat near y = 0.3 A jet emits several hadrons and the p T distribution of the produced hadrons in the jet is similar to that in multiple particle production [8]. …”

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confidence: 76%

Adiabatic expansion of nuclear matter gas to describe violation of Feynman scaling law in multiple particle production

2019

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The main features of the rapidity density distribution of the produced hadrons in multiple particle production in nucleon collisions are; (a) the distribution in the forward region (ȳ ≥ 0) has a shape similar to the Fermi distribution, (b) the distribution in the most forward region reaches almost the maximum rapidity ymax = ln(√s/M) (M : nucleon mass), and (c) the shrinkage of the distribution from the maximum rapidity increases with the incident energy (i.e. violation of Feynman scaling law). These features are possible to be described by the assumptions that; (1) a fireball of the gas (made of nuclear matter, with the temperature Ti and with the shape of the incident nucleon with Lorentz contraction) is produced in the collision, (2) the fireball makes the adiabatic expansion, and (3) the constituent particles of the gas obey the Maxwell-Boltzmann distribution of the temperature Tf in the final state.

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confidence: 76%

Adiabatic expansion of nuclear matter gas to describe violation of Feynman scaling law in multiple particle production

2019

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Some Stories of Brasil-Japan Collaboration and Chacaltaya Mountain

Barroso¹,

Beggio

et al. 2019

EPJ Web Conf.

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An international cooperation, named Brasil-Japan Collaboration of Chacaltaya Emulsion Chamber Experiment (B-J Collaboration) exposed 2.35 × 108 m2.s, during the period 15thJun, 1962 till 10thMay, 1988. It corresponds to 22 'runs' on Cosmic Rays and in this figure are not included photosensitive material set in the lower part of the two-storied emulsion chamber. Although 3 more 'runs' occurred after 1988, they were not included either, because they were not yet properly measured and because they contain mixed Japanese and Russian films. Chacaltaya Mountain was firstly used in 1947 for 2 meson observations and π - μ decays. It was a wise choice not only for these observations but also for the B-J Collaboration and for the Alpaca Project, running at neighbouring sites. The main results observed by the B-J Collaboration are presented.

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Breakdown of Feynman scaling law and cosmic-ray exotic events

Ohsawa

Sawayanagi

1992

Phys. Rev. D

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The breakdown of the Feynman scaling law, observed at the CERN SPS pp collider (&s =540 or 900 GeV), leads to decreasing inelasticity, which is not compatible with high-energy cosmic-ray data {E0 =10' -10' eV) obtained through emulsion-chamber experiments. It is pointed out that the existence of the cosmic-ray exotic events of Centauro, Chiron, etc. , possibly reconciles the discrepancy. PACS number{s): 13.85. Tp, 13.85.Hd

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Analyses of C-Jets Observed by Chacaltaya Emulsion Chamber

Cited by 4 publications

References 16 publications

Adiabatic expansion of nuclear matter gas to describe violation of Feynman scaling law in multiple particle production

Adiabatic expansion of nuclear matter gas to describe violation of Feynman scaling law in multiple particle production

Some Stories of Brasil-Japan Collaboration and Chacaltaya Mountain

Breakdown of Feynman scaling law and cosmic-ray exotic events

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