1995 Fiscal Year Final Research Report Summary
The study of Quark-Gluon-Plasma in ultrarelativistic nuclear Collisions
| Project/Area Number |
07044322
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| Research Category |
Grant-in-Aid for International Scientific Research.
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| Allocation Type | Single-year Grants |
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| Research Institution | Hiroshima University |
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Principal Investigator |
MIYAMURA Osamu Department of Physics, Hiroshima University, Professor, 理学部, 教授 (80029511)
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| Co-Investigator(Kenkyū-buntansha) |
陸 中道 中国原子能科学研究院, 準教授
鄭 玉明 中国原子能科学研究院, 準教授
張 孝澤 中国原子能科学研究院, 教授
SA Ben-hao China Institute of Atomic Energy, Professor, 教授
MUROYA Shin Tokuyama Women's College, Lecturer, 講師 (70239557)
HIOKI Shunjl Department of Physics, Hiroshima University, Research Associate, 理学部, 助手 (70238252)
SUMI Yoshio Department of Physics, Hiroshima University, Professor, 理学部, 教授 (20029490)
LU Zhong-dao China Institute of Atomic Energy, Associate Professor
ZHENG Yu-ming China Institute of Atomic Energy, Associate Professor
ZHANG Xiao-ze China Institute of Atomic Energy, Professor
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| Project Period (FY) |
1995
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| Keywords | Quark-Gluon-Plasma / Event generator / Ultrarelativistic nuclear collisions / Chiral transition / HBT effect / Two particle interferometry |
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| Research Abstract |
Research and obtalned results
1. Study of temperature and density formed by the pb-pb collisions at energies around 160 GeV/nucleon
Thermalization of collision complex formed by pb-pb collisions at 160GeV is studied by an event generator developed in this collaboration.
Simulations and analysis have been carried out in collaboration with CIAE.
Main results are : (1) Thermalization undergoes after 10^<@62> (-13) second. (2) Achieved temperature is 80-110 MeV and its duration is about 3*10^<@62> (1-13) second. (3) Achieved density is 10^<@62> (39) /cm^<@62>3.
2. Study of the relationsip between particle source size and space-time parameters obtained by two particle interferometry
Real space-time extension and space-time parameters obtained by nterferometry experiment are compared by the use of event generator. Main results are : (1) Because of relativistic nature, whole space-time extension can not be observed by a interferometry : experiment. (2) Momentum restriction causes serious difference. (3) This is typically seen in longitudinal extension. These results have been summarized by T.D Lu (CIAE) in his visit at Hiroshima.
3. Theory of two particle interferometry with disoriented chiral condensate
Two particle distribution from disoriented chiral condensate hnd been studied by T.D Lu, Muroya, Miyamura and Hioki. Results are : (1) Formula for two pion correlation in the case of many dcc domains. (2) Unlike pion pair has also correlation. (3) Unlik pions are correlated in the case of small and opposite momenta. This research has been extended by the visiting of Muroya at CIAE with B.H Sa and Y.M.Zheng.
4. Study of baryonic susceptibility near the chiral phase transition at finite density
Baryonic susceptibility near chiral transition of quark-gluon plasma has calculated by Nambu-Jona-Lasinio model. At finite density, anomalous enhancement of it has been found. Study of implications of it in high energy nucleus collision and nucleosynthesis in early universe is now continuing.
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