1990 Fiscal Year Final Research Report Summary
A Study on Coherency of Cold Neutron Waves by Multilayer Interferometer
| Project/Area Number |
01540317
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
物理学一般
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| Research Institution | Kyoto University |
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Principal Investigator |
EBISAWA Toru Kyoto Univ., R. R. I., ^* Researcher^* : Research Reactor Institute, 原子炉実験所, 助手 (30027453)
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| Co-Investigator(Kenkyū-buntansha) |
ACHIWA Norio Kyushu Univ., Science, Assistant Professor, 理学部, 助教授 (60027456)
AKIYOSHI Tsunekazu Kyoto Univ., R. R. I., Lecture, 原子炉実験所, 講師 (40027420)
TASAKI Seiji Kyoto Univ., R. R. I., Researcher, 原子炉実験所, 助手 (40197348)
KAWAI Takeshi Kyoto Univ., R. R. I., Researcher, 原子炉実験所, 助手 (20027436)
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| Project Period (FY) |
1989 – 1990
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| Keywords | Neutron Interferometer / Multilayer Neutron Mirror / Cold Neutron / Magnetic Multilayer Neutron Mirror / Polarized Neutron |
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| Research Abstract |
Multilayer neutron interferometer has advantages that is not only suitable for cold neutron, but also has a wide application to physical phenomenon relevant to neutron spin owing to controlling neutron spin directly by magnetic interferometer mirror. Our study goal by the Grant-in-aid is to develope the interferometer and apply to coherency study of cold neutron waves. The interferometer developed in 1989, however, did not have a good contrast of the interference pattern. The contrast, therefore, should be improved for the applications to physical phenomena, and investigations, trial productions and tests for it have been made in 1990. A good contrast has not attained as a result and we could not advance to experimental application. A considerable progress, however, have been made in both branches of the development of the multilayer neutron interferometer and it's applications to physicas follows :
(1) The development of high resolution multilayer neutron monochromators, semi-transparent mirrors, reflection mirrors and magnetic multilayer mirrors have been made.
(2) Position accuracy of the 4 mirror surfaces for the interferometer is required less than 0.2 micron to attain a good contrast. The methods for it have been found and the improvements are being made.
(3) The temparature control has been made less than 0.02 degrees.
(4) The air cushion bench has a good antivibrating performance.
(5) Fabrication of Michelson type neutron interferometer and the upper limit measurement of neutron charge would be made as special theme for the multilayer interferometer. Delayed choice experiment, double Stern-Gelrach experiment and spin dependency experiment of the gravity are discussed concretely.
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