2000 Fiscal Year Final Research Report Summary
Search for Dark Matter Axions
| Project/Area Number |
09102010
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| Research Category |
Grant-in-Aid for Specially Promoted Research
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| Allocation Type | Single-year Grants |
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| Review Section |
Physics
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
MATSUKI Seishi Institute for Chemical Research, Kyoto University, Associate Professor, 化学研究所, 助教授 (50037941)
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| Co-Investigator(Kenkyū-buntansha) |
FUNAHASHI Haruhiko School of Science, Kyoto University, Research Associate, 理学研究科, 助手 (00283581)
YAMAMOTO Katsuji School of Engineering, Kyoto University, Associate Professor, 工学研究科, 助教授 (90191395)
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| Project Period (FY) |
1997 – 2002
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| Keywords | Universe / Dark Matter / Axion / Rydberg atoms / Microwave detection / Microwave cavity |
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| Research Abstract |
Identification of dark matter in the Universe is one of the most important issues in Particle physics as well as Astrophysics. Axion is the leading candidate for the cold dark matter particles with neutralinos. We developed the Rydberg-atom cavity detector to search for dark matter axions where the axions are converted into microwave photons in resonant cavity permeated by a strong magnetic field and then the photons are absorbed by highly excited Rydberg atoms. Excited Rydberg atoms are then field ionized and detected. The cavity and the related detectors are cooled down to 10 mK range to suppress the thermal blackbody photons in the cavity with a dilution refrigerator. Based on the prototype apparatus CARRACK1, a large scale apparatus CARRACK2 was constructed with which axions with a wide range of mass can be searched for. Axion at 10 μeV mass was searched, in which the covered axion mass range is about 8%. Further search for lighter mass of axions is in progress. At the same time we made effort to improve various part of the apparatus to get higher detection efficieny. One of such improvements resulted from the use of the pulsed electric field for the field ionization. Quite selective ionization scheme thus enabled us to continue the search experiment more efficiently. We will search for axions further in a wide range of mass with this detector system.
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[Publications] I.Ogawa, Y.Kishimoto, M.Tada, S.Matsuki, K.Yamamoto, A.Masaike, S.Watanabe, and M.Matsuzawa: "Search for Dark Matter Axions with Rydberg Atoms in Resonant Cavities."Proceedings of the second RESCEU International Symposium on Dark Matter in the Universe and its Direct Detection, Nov., 1996, Tokyo, ed.M.Minowa (Universal Academy Press, Tokyo). (1997)
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「研究成果報告書概要(欧文)」より
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[Publications] S.Matsuki, M.Tada, Y.Kishimoto, M.Shibata, K.Kominato, C.Ooishi, H.Funahashi, K.Yamamoto and A.Masaike: "Progress in Kyoto axion search experiment."Proceedings of the Second International Workshop on the Identification of Dark Matter, Buxton UK, 1998, eds.N.J.Spooner and V.Kudryatsev, (World Scientific, Singapore). (1999)
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[Publications] Y.Kishimoto, M.Tada, M.Shibata, K.Kominato, C.Ooishi, H.Funahashi, K.Yamamoto, A.Masaike and S.Matsuki: "The CARRACK-2 Axion Experiment."Proceedings of the Second International Workshop on the Identification of Dark Matter, Buxton UK, 1998, eds.N.J.Spooner and V.Kudryatsev, (World Scientific, Singapore). (1999)
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[Publications] K.Yamamoto, M.Tada, Y.Kishimoto, K.Kominato, M.Shibata, C.Ooishi, S.Yamamda, T.Saida, H.Funahashi, A.Masaike and S.Matsuki: "The Rydberg-Atom-Cavity Axion Search."International Symposium on the Dark Matter in the Universe, Heidelberg Germany. (2000)
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