1998 Fiscal Year Final Research Report Summary
Physics using ultra low-energy pulsed antiprotons
| Project/Area Number |
09044061
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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 Field |
素粒子・核・宇宙線
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| Research Institution | THE UNIVERSITY OF TOKYO |
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Principal Investigator |
HAYANO Ryugo THE UNIVERSITY OF TOKYO,Graduate School of Science, Professor, 大学院・理学系研究科, 教授 (30126148)
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| Co-Investigator(Kenkyū-buntansha) |
HOLTZSCHEITE エム ロスアラモス国立研究所, 上級研究員
HORVATH Dezso RMKI Research Institute for Nuclear Physics, Senior Scientist, 上級研究員
EADES J. 欧州原子核研究機構, 上級研究員
KORENMAN Grigori Moscow University, Nuclear Physics Institute, Senior Scientist, 原子核研究所, 上級研究員
YAMAZAKI Yasunori THE UNIVERSITY OF TOKYO,Graduate School OF Arts and Sciences, PROFESSOR, 大学院・総合文化研究科, 教授 (30114903)
EADES John CERN,Senior Scientist
HOLZSCHEITER Michael Los Alamos National Laboratory, Senior Scientist
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| Project Period (FY) |
1997 – 1998
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| Keywords | Antiproton / Antiprotonic Helium Atom / Exotic Atom / Protonium / Laser Spectroscopy / Atomic Collisions / Antihydrogen / CERN |
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| Research Abstract |
A new pulsed low-energy antiproton source, AD (antiproton decelerator), will start its operation from 1999 at CERN.This research, both experimental and theoretical, was conducted so as to develop research program using the AD beam. At AD, laser spectroscopy of antiprotonic helium atoms, the work we pioneered at the low energy antiproton ring (LEAR), will reach much higher precision. In addtion, study of other exotic systems such as protonium (bound state of an antiproton and a proton) and anti-hydrogen will be conducted. The major results are as follows :
1. A proposal of an experiment at CERN AD, called "Atomic Spectroscopy and Collisions using Slow Antiprotons (ASACUSA)" was submitted to CERN, and was approved.
2. The design study of-radio frequency quadrupole (RFQ) antiproton decelerator, which can decelerate the 5 MeV beam from the AD to about 50 keV, was completed in collaboration with CERN.
3. Detailed analysis of antiprotonic helium laser spectroscopy data was done, and the results were compared with the high-precision results of recent quantum three-body theory. The agreement was better than 2 ppm, from which we could improve the accuracy of antiproton mass from the present value of 50 ppm to 0.5 ppm.
4. A conceptual design of an experiment for protonium laser spectroscopy was done. Being a two-body system, it should be possible to deduce antiproton mass from protonium spectroscopy without the help of complicated three-body theories. The proposed scheme will use the low-energy antiprotons from the RFQ, decelerate them further using a catching trap, and form protoniums in vacuum by collision with atomic hydrogens. The estimated accuracy is 10^<-9> or better.
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