1995 Fiscal Year Final Research Report Summary
Search for Matter/Antimatter in Early Universe
| Project/Area Number |
05044064
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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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| Section | Joint Research |
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| Research Institution | National Laboratory for High Energy Physics |
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Principal Investigator |
YAMAMOTO Akira National Laboratory for High Energy Physics (KEK) Associate Professor, 物理学, 助教授 (30113418)
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| Co-Investigator(Kenkyū-buntansha) |
ORMES Jonathan NASA/GSFC, 部長
YAMAGAMI Takamasa The Institute of Space and Astronautical Science (ISAS), システム研究系, 助教授 (40013718)
YAJIMA Nobuyuki The Institute of Space and Astronautical Science (ISAS), システム研究系, 教授 (30200489)
MAKIDA Yasuhiro National Laboratory for High Energy Physics, 物理部, 助手 (30199658)
YOSHI Tetsuya University of Tokyo, 理学部, 助手 (50222394)
IMORI Masatoshi University of Tokyo, 理学部, 助手 (70011690)
NOZAKI Mitsuaki Kobe University, 理学部, 助教授 (10156193)
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| Project Period (FY) |
1993 – 1995
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| Keywords | The Universe / Cosnic-ray / Origin of the Universe / Anti matter / Anti particle / Elementary Particles / C-P violation |
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| Research Abstract |
Based on the experimence integrated in previous years, the superconducting spectrometer, BESS,has been up-graded specially in particle identification in an energy range of < 1 GeV.
The balloon flight using the BESS spectrometer, in JFY 1995, was carried out in north Canada for a duration between June-August, 1995. Ten participants were deligated with support of this grant. As a scientific result, about forty low energy cosmic-ray antiprotons was observed in the scientific balloon flight on July 25-26,1995, and the first cosmic-ray antiproton observation in the previous years have been well verified with > 40 antiproton obserbation, this year. Antiparticle search in cosmic-ray has been progressed with a sensitivity down to 2*10^<-6> in antihelium/helium ratio.
These results have been published in Physical Review Letters and was presented in the Internaional cosmic-Ray Conference, in 1995, in very high evaluation in this field.
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