| Project/Area Number |
59420004
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
核・宇宙線・素粒子
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
1984 – 1985
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| Project Status |
Completed (Fiscal Year 1985)
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| Budget Amount *help |
¥37,500,000 (Direct Cost: ¥37,500,000)
Fiscal Year 1985: ¥10,000,000 (Direct Cost: ¥10,000,000)
Fiscal Year 1984: ¥27,500,000 (Direct Cost: ¥27,500,000)
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| Keywords | ハドロン・原子核反応 / 高エネルギー重イオン反応 / K中間子生成 / 高精度粒子速度測定装置 / チエレンコフカウンター |
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| Research Abstract |
In high-energy hadron-nucleus and nucleus-nucleus collisions it is important and interesting to measure K mesons in the momentum range of about a few GeV/c. Currently, however, since the experimental technique to detect and identify these mesons in this momentum range has not been well established, no detailed studies of K-meson production in this momentun range have been carried out in the past experiment. In this project we developed various new techniques with which to select and identify K mesons with momenta from 1 to 20 GeV/c out of huge pion and proton backgrounds. For example, we succeeded in constructing a timeof-flight counter system of scintillators with time resolution of <sigma> = 50 ps, which is a world record in <sigma> . We made high-pressure gas Cerenkov counters to allow particle identification up to 20 GeV/c. We invented a new and simple detector system out of Pb blocks and scintillators to selectively detect <K゛+> with momenta up to 1 GeV/c. In addition, we have started to make a new counter, using a novel technique called ring imaging of Cerenkov lights. Using these counters we plan to detect K mesons in the experiment that we plan to perform at Brookhaven National Laboratory. The data taking of this experiment will start soon during the year of 1986.
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