1997 Fiscal Year Final Research Report Summary
BESS Experiment to Search for Cosmic Ray Antiparticle
| Project/Area Number |
08044102
|
|---|
| Research Category |
Grant-in-Aid for international Scientific Research
|
| Allocation Type | Single-year Grants |
|---|
| Section | Joint Research . |
|---|
| Research Field |
素粒子・核・宇宙線
|
|---|
| Research Institution | High Energy Accelerator Research Organization |
|---|
Principal Investigator |
YAMAMOTO Akira High Energy Accele, Re.Org., Applied Research Lab.Prof., 低温工学センター, 教授 (30113418)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
ORMES Jonathan NASA/GSFC/LHEA,Chief Scientist, 高エネルギー宇宙物理研究所, 所長
YOSHIMURA Koji Univ.of Tokyo, ICEPP,Res.Associate, 素粒子物理国際センター, 助手 (50272464)
ORITO Shuji Univ.of Tokyo, Faculty of Science, Prof., 理学部, 教授 (10092173)
MAKIDA Yasuhiro High Energy Accele, Re.Org., Inst.of Particle and Nucl.Studies, Res.Associate, 低温工学センター, 助手 (30199658)
YOSHIDA Tetsuya High Energy Accele, Re.Org., Inst.of Particle and Nucl.Studies, Associated Prof., 低温工学センター, 助教授 (50222394)
|
|---|
| Project Period (FY) |
1996 – 1997
|
| Keywords | The Universe / Cosmic Ray / Origin of the Universe / Anti Matter / Anti Particle / Elementary Particles / C-P Violation |
|---|
| Research Abstract |
The Balloon-borne Experiment with t Superconducting magnet Spectrometer (BESS) has been carried out in a collaboration amongst High Energy Accelerator Research Organization, University of Tokyo, Kobe University, Institute for Space and Astronautical Science. The ballooning has been supported by NASA balloon project office.
Search for cosmic-ray antiprotons has been carried out, and more than 400 cosmic-ray ntiprotons have been detected in an energy range of 0.5-1 GeV with the definitive identification by direct mass measurement.
Search for antihelium has been also made and no candidates have been detected in a rigidity range below 16 GV with the possible upper limit of 3x10^<-6> in He-bar/He ratio. Those results have been published partly already published in Physical Review Letters and The Astrophysical Journal
|
