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Publications (7)14.87 Total impact

  • Shigenori Kagiyama, Akira Minaka, Akihiro Nakamura
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    ABSTRACT: The compressible bag model of hadronic matter, including baryons and dibaryons, is formulated at finite temperature, and the phase structure of the matter is investigated in the model. It is shown that, for most cases, dibaryons are found in the condensed phase. The effect of the condensation on experimental data is discussed.
    Progress of Theoretical Physics 01/1996; 95(4):793-802. · 2.48 Impact Factor
  • Shigenori Kagiyama, Akira Minaka, Akihiro Nakamura
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    ABSTRACT: The compressible bag model at finite temperature is given and solved to give the equation of state. The bag has inifinite series of mass level but there is no limiting temperature for reasonable values of the bag constant, and then the transition to quark phase takes place in the model.
    Progress of Theoretical Physics 06/1993; 89(6):1227-1233. · 2.48 Impact Factor
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    ABSTRACT: We propose 'dibaryon stars' on the base of the compressible bag model, in which a hadron bag responds microscopic thermal pressure of the other bags and the volume exclusion effect is considered. In general, a free bosonic point-particle matter has no pressure at zero temperature, but a condensed bosonic 'bag' matter is able to have a finite pressure because of both the compressibility and the volume exclusion effects. In contrast to pion condensations, a dibaryon may be condensed with finite chemical potential and without destroying the translational invariance if it is a scalar particle. We will show that the condensed dibaryon matter can not only produce a very soft equation of state but can also bring the 1.44 solar mass star.
    Zeitschrift für Physik C 11/1992; -1:1795-1802.
  • Shigenori Kagiyama, Akira Minaka, Akihiro Nakamura
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    ABSTRACT: Using the previous results on the hadronization temperature of the hadronic fluid at the hadronization, we show that the initial temperature of the fluid can be determined by the experimental particle density, dN/dy, in the central rapidity region. The initial temperature reaches near to the deconfinement temperature for Tevatron energies.
    Progress of Theoretical Physics 01/1989; 81(6):1091-1094. · 2.48 Impact Factor
  • Shigenori Kagiyama, Akira Minaka, Akihiro Nakamura
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    ABSTRACT: It is shown that the hadronization temperature and the transverse velocity can be determined simultaneously by for pions and kaons produced in the central rapidity region. The data suggest that the temperature is nearly constant while the transverse velocity grows with the incident energy.
    Progress of Theoretical Physics 01/1989; 81(2):266-270. · 2.48 Impact Factor
  • Shigenori Kagiyama, Akihiro Nakamura, Akira Minaka
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    ABSTRACT: A model of multi-particle production assuming the formation of the quark-gluon plasma is proposed. The hadronization is realized via the cylindrical expansion of quark-gluon fluid. The momentum spectrum of hadron is related to the expansion velocity of the fluid. The transverse expansion veloscity of the fluid is related to the initial energy density epsilon _0 of quark-gluon plasma, and the value of epsilon _0 is assumed to be mainly controlled by the color dimension of the flux tube. The model well explains the p bar{p} collider data of correlation between the average p_t and the central particle density.
    Progress of Theoretical Physics 01/1986; 75(2):319-332. · 2.48 Impact Factor
  • Shigenori Kagiyama, Akihiro Nakamura, Akira Minaka
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    ABSTRACT: Space-time evolution of the relativistic perfect fluid of quarks and gluons is calculated numerically in three dimensional space with cylindrically symmetric initial condition. In order to assure the computational validity, the total energy and the total entropy are calculated at every step of the evolution with the proper time. The temperature itself decreases rapidly, but the effective temperature, defined by the temperature multiplied by the Lorentz factor in the transverse direction, falls down rather slowly and approaches some asymptotic value. This behavior of the effective temperature suggests that one can get the information on the initial state of the quark-gluon fluid from the experimental pt distribution of produced hadrons.
    Progress of Theoretical Physics 01/1986; 76(1):171-183. · 2.48 Impact Factor