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20 results on '"Sakata M"'

1. First Detection of Photons with Energy beyond 100TeV from an Astrophysical Source

Author

Amenomori, M., Bao, Y. W., Bi, X. J., Chen, D., Chen, T. L., Chen, W. Y., Chen, Xu, Chen, Y., Cirennima, null, Cui, S. W., Danzengluobu, null, Ding, L. K., Fang, J. H., Fang, K., Feng, C. F., Feng, Zhaoyang, Feng, Z. Y., Gao, Qi, Gou, Q. B., Guo, Y. Q., He, H. H., He, Z. T., Hibino, K., Hotta, N., Hu, Haibing, Hu, H. B., Huang, J., Jia, H. Y., Jiang, L., Jin, H. B., Kajino, F., Kasahara, K., Katayose, Y., Kato, C., Kato, S., Kawata, K., Kozai, Masayoshi, Labaciren, null, Le, G. M., Li, A. F., Li, H. J., Li, W. J., Lin, Y. H., Liu, B., Liu, C., Liu, J. S., Liu, M. Y., Lou, Y.-Q., Lu, H., Meng, X. R., Mitsui, H., Munakata, K., Nakamura, Y., Nanjo, H., Nishizawa, M., Ohnishi, M., Ohta, I., Ozawa, S., Qian, X. L., Qu, X. B., Saito, T., Sakata, M., Sako, T. K., Sengoku, Y., Shao, J., Shibata, M., Shiomi, A., Sugimoto, H., Takita, M., Tan, Y. H., Tateyama, N., Torii, S., Tsuchiya, H., Udo, S., Wang, H., Wu, H. R., Xue, L., Yagisawa, K., Yamamoto, Y., Yang, Z., Yuan, A. F., Zhai, L. M., Zhang, H. M., Zhang, J. L., Zhang, X., Zhang, X. Y., Zhang, Y., Zhang, Yi, Zhang, Ying, Zhaxisangzhu, null, and Zhou, X. X.

Subjects
Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Muon, Photon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, General Physics and Astronomy, FOS: Physical sciences, Cosmic ray, Photon energy, 01 natural sciences, Nuclear physics, Crab Nebula, Air shower, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, 010306 general physics, Astrophysics - High Energy Astrophysical Phenomena, Energy (signal processing), Muon detector
Abstract

著者人数: Tibet ASγ Collaboration 91名 (所属. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS): 小財, 正義), Number of authors: Tibet ASγ Collaboration 91 (Affiliation. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS): Kozai, Masayoshi), 資料番号: SA1190109000

Published
2019

3. Charge Ordering and Spin Frustration inAlV2−x CrxO4

Author

Matsuno, K., primary, Katsufuji, T., additional, Mori, S., additional, Nohara, M., additional, Machida, A., additional, Moritomo, Y., additional, Kato, K., additional, Nishibori, E., additional, Takata, M., additional, Sakata, M., additional, Kitazawa, K., additional, and Takagi, H., additional

Published
2003
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6. Search forγrays from the supernova 1987A at energies greater than 100 TeV

Author

Bond, I. A., primary, Budding, E., additional, Conway, M. J., additional, Fenton, K. B., additional, Fujii, H., additional, Fujii, Z., additional, Hasegawa, H., additional, Hayashida, N., additional, Honda, M., additional, Hotta, N., additional, Humble, J. E., additional, Kabe, S., additional, Kasahara, K., additional, Kifune, T., additional, Masaike, A., additional, Matsubara, Y., additional, Mitsui, K., additional, Miura, Y., additional, Mori, M., additional, Murakami, K., additional, Muraki, Y., additional, Nagano, M., additional, Nakamura, K., additional, Nakamura, T., additional, Norris, P. M., additional, Ohashi, Y., additional, Okada, A., additional, Saito, To., additional, Sakata, M., additional, Sato, H., additional, Shibata, S., additional, Shima, M., additional, Storey, J. R., additional, Tanimori, T., additional, Teshima, M., additional, Torii, S., additional, Uchino, K., additional, Watase, Y., additional, Woodhams, M. D., additional, Yamamoto, Y., additional, Yock, P. C. M., additional, and Yuda, T., additional

Published
1988
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7. Search for TeVγrays from SN 1987 A during December 1987 and January 1988

Author

Bond, I. A., primary, Budding, E., additional, Conway, M. J., additional, Fenton, K. B., additional, Fujii, H., additional, Fujii, Z., additional, Fujimoto, M., additional, Hasegawa, H., additional, Hayashida, N., additional, Honda, M., additional, Hotta, N., additional, Humble, J. E., additional, Kabe, S., additional, Kasahara, K., additional, Kifune, T., additional, Masaike, A., additional, Matsubara, Y., additional, Mitsui, K., additional, Miura, Y., additional, Mori, M., additional, Murakami, K., additional, Muraki, Y., additional, Nagano, M., additional, Nakamura, K., additional, Nakamura, T., additional, Norris, P. M., additional, Ohashi, Y., additional, Okada, A., additional, Saito, To., additional, Sakata, M., additional, Sato, H., additional, Shibata, S., additional, Shima, M., additional, Storey, J. R., additional, Tanimori, T., additional, Teshima, M., additional, Torii, S., additional, Uchino, K., additional, Watase, Y., additional, Woodhams, M. D., additional, Yamamoto, Y., additional, Yock, P. C. M., additional, and Yuda, T., additional

Published
1988
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8. Gamma-Ray Observation of the Cygnus Region in the 100-TeV Energy Region.

Author

Amenomori M, Bao YW, Bi XJ, Chen D, Chen TL, Chen WY, Chen X, Chen Y, Cirennima, Cui SW, Danzengluobu, Ding LK, Fang JH, Fang K, Feng CF, Feng Z, Feng ZY, Gao Q, Gomi A, Gou QB, Guo YQ, Guo YY, He HH, He ZT, Hibino K, Hotta N, Hu H, Hu HB, Huang J, Jia HY, Jiang L, Jiang P, Jin HB, Kasahara K, Katayose Y, Kato C, Kato S, Kawata K, Kozai M, Kurashige D, Labaciren, Le GM, Li AF, Li HJ, Li WJ, Li Y, Lin YH, Liu B, Liu C, Liu JS, Liu LY, Liu MY, Liu W, Liu XL, Lou YQ, Lu H, Meng XR, Munakata K, Nakada H, Nakamura Y, Nakazawa Y, Nanjo H, Ning CC, Nishizawa M, Ohnishi M, Ohura T, Okukawa S, Ozawa S, Qian L, Qian X, Qian XL, Qu XB, Saito T, Sakata M, Sako T, Sako TK, Shao J, Shibata M, Shiomi A, Sugimoto H, Takano W, Takita M, Tan YH, Tateyama N, Torii S, Tsuchiya H, Udo S, Wang H, Wang YP, Wangdui, Wu HR, Wu Q, Xu JL, Xue L, Yamamoto Y, Yang Z, Yao YQ, Yin J, Yokoe Y, Yu NP, Yuan AF, Zhai LM, Zhang CP, Zhang HM, Zhang JL, Zhang X, Zhang XY, Zhang Y, Zhang Y, Zhang Y, Zhao SP, Zhaxisangzhu, and Zhou XX

Abstract

We report observations of gamma-ray emissions with energies in the 100-TeV energy region from the Cygnus region in our Galaxy. Two sources are significantly detected in the directions of the Cygnus OB1 and OB2 associations. Based on their positional coincidences, we associate one with a pulsar PSR J2032+4127 and the other mainly with a pulsar wind nebula PWN G75.2+0.1, with the pulsar moving away from its original birthplace situated around the centroid of the observed gamma-ray emission. This work would stimulate further studies of particle acceleration mechanisms at these gamma-ray sources.

Published
2021
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9. First Detection of sub-PeV Diffuse Gamma Rays from the Galactic Disk: Evidence for Ubiquitous Galactic Cosmic Rays beyond PeV Energies.

Author

Amenomori M, Bao YW, Bi XJ, Chen D, Chen TL, Chen WY, Chen X, Chen Y, Cirennima, Cui SW, Danzengluobu, Ding LK, Fang JH, Fang K, Feng CF, Feng Z, Feng ZY, Gao Q, Gou QB, Guo YQ, Guo YY, He HH, He ZT, Hibino K, Hotta N, Hu H, Hu HB, Huang J, Jia HY, Jiang L, Jin HB, Kasahara K, Katayose Y, Kato C, Kato S, Kawata K, Kihara W, Ko Y, Kozai M, Labaciren, Le GM, Li AF, Li HJ, Li WJ, Lin YH, Liu B, Liu C, Liu JS, Liu MY, Liu W, Lou YQ, Lu H, Meng XR, Munakata K, Nakada H, Nakamura Y, Nanjo H, Nishizawa M, Ohnishi M, Ohura T, Ozawa S, Qian XL, Qu XB, Saito T, Sakata M, Sako TK, Shao J, Shibata M, Shiomi A, Sugimoto H, Takano W, Takita M, Tan YH, Tateyama N, Torii S, Tsuchiya H, Udo S, Wang H, Wu HR, Xue L, Yamamoto Y, Yang Z, Yokoe Y, Yuan AF, Zhai LM, Zhang HM, Zhang JL, Zhang X, Zhang XY, Zhang Y, Zhang Y, Zhang Y, Zhao SP, Zhaxisangzhu, and Zhou XX

Abstract

We report, for the first time, the long-awaited detection of diffuse gamma rays with energies between 100 TeV and 1 PeV in the Galactic disk. Particularly, all gamma rays above 398 TeV are observed apart from known TeV gamma-ray sources and compatible with expectations from the hadronic emission scenario in which gamma rays originate from the decay of π^{0}'s produced through the interaction of protons with the interstellar medium in the Galaxy. This is strong evidence that cosmic rays are accelerated beyond PeV energies in our Galaxy and spread over the Galactic disk.

Published
2021
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10. First Detection of Photons with Energy beyond 100 TeV from an Astrophysical Source.

Author

Amenomori M, Bao YW, Bi XJ, Chen D, Chen TL, Chen WY, Chen X, Chen Y, Cirennima, Cui SW, Danzengluobu, Ding LK, Fang JH, Fang K, Feng CF, Feng Z, Feng ZY, Gao Q, Gou QB, Guo YQ, He HH, He ZT, Hibino K, Hotta N, Hu H, Hu HB, Huang J, Jia HY, Jiang L, Jin HB, Kajino F, Kasahara K, Katayose Y, Kato C, Kato S, Kawata K, Kozai M, Labaciren, Le GM, Li AF, Li HJ, Li WJ, Lin YH, Liu B, Liu C, Liu JS, Liu MY, Lou YQ, Lu H, Meng XR, Mitsui H, Munakata K, Nakamura Y, Nanjo H, Nishizawa M, Ohnishi M, Ohta I, Ozawa S, Qian XL, Qu XB, Saito T, Sakata M, Sako TK, Sengoku Y, Shao J, Shibata M, Shiomi A, Sugimoto H, Takita M, Tan YH, Tateyama N, Torii S, Tsuchiya H, Udo S, Wang H, Wu HR, Xue L, Yagisawa K, Yamamoto Y, Yang Z, Yuan AF, Zhai LM, Zhang HM, Zhang JL, Zhang X, Zhang XY, Zhang Y, Zhang Y, Zhang Y, Zhaxisangzhu, and Zhou XX

Abstract

We report on the highest energy photons from the Crab Nebula observed by the Tibet air shower array with the underground water-Cherenkov-type muon detector array. Based on the criterion of a muon number measured in an air shower, we successfully suppress 99.92% of the cosmic-ray background events with energies E>100  TeV. As a result, we observed 24 photonlike events with E>100  TeV against 5.5 background events, which corresponds to a 5.6σ statistical significance. This is the first detection of photons with E>100  TeV from an astrophysical source.

Published
2019
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11. Evaluation of the Interplanetary Magnetic Field Strength Using the Cosmic-Ray Shadow of the Sun.

Author

Amenomori M, Bi XJ, Chen D, Chen TL, Chen WY, Cui SW, Danzengluobu, Ding LK, Feng CF, Feng Z, Feng ZY, Gou QB, Guo YQ, He HH, He ZT, Hibino K, Hotta N, Hu H, Hu HB, Huang J, Jia HY, Jiang L, Kajino F, Kasahara K, Katayose Y, Kato C, Kawata K, Kozai M, Labaciren, Le GM, Li AF, Li HJ, Li WJ, Liu C, Liu JS, Liu MY, Lu H, Meng XR, Miyazaki T, Mizutani K, Munakata K, Nakajima T, Nakamura Y, Nanjo H, Nishizawa M, Niwa T, Ohnishi M, Ohta I, Ozawa S, Qian XL, Qu XB, Saito T, Saito TY, Sakata M, Sako TK, Shao J, Shibata M, Shiomi A, Shirai T, Sugimoto H, Takita M, Tan YH, Tateyama N, Torii S, Tsuchiya H, Udo S, Wang H, Wu HR, Xue L, Yamamoto Y, Yamauchi K, Yang Z, Yuan AF, Yuda T, Zhai LM, Zhang HM, Zhang JL, Zhang XY, Zhang Y, Zhang Y, Zhang Y, Zhaxisangzhu, and Zhou XX

Abstract

We analyze the Sun's shadow observed with the Tibet-III air shower array and find that the shadow's center deviates northward (southward) from the optical solar disk center in the "away" ("toward") interplanetary magnetic field (IMF) sector. By comparing with numerical simulations based on the solar magnetic field model, we find that the average IMF strength in the away (toward) sector is 1.54±0.21_{stat}±0.20_{syst} (1.62±0.15_{stat}±0.22_{syst}) times larger than the model prediction. These demonstrate that the observed Sun's shadow is a useful tool for the quantitative evaluation of the average solar magnetic field.

Published
2018
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12. Pressure-induced metallization of molybdenum disulfide.

Author

Chi ZH, Zhao XM, Zhang H, Goncharov AF, Lobanov SS, Kagayama T, Sakata M, and Chen XJ

Abstract

X-ray diffraction, Raman spectroscopy, and electrical conductivity measurements of molybdenum disulfide MoS(2) are performed at pressures up to 81 GPa in diamond anvil cells. Above 20 GPa, we find discontinuous changes in Raman spectra and x-ray diffraction patterns which provide evidence for isostructural phase transition from 2H(c) to 2H(a) modification through layer sliding previously predicted theoretically. This first-order transition, which is completed around 40 GPa, is characterized by a collapse in the c-lattice parameter and volume and also by changes in interlayer bonding. After the phase transition completion, MoS(2) becomes metallic. The reversibility of the phase transition is identified from all these techniques.

Published
2014
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13. Probe of the solar magnetic field using the "cosmic-ray shadow" of the sun.

Author

Amenomori M, Bi XJ, Chen D, Chen TL, Chen WY, Cui SW, Danzengluobu, Ding LK, Feng CF, Feng Z, Feng ZY, Gou QB, Guo YQ, Hakamada K, He HH, He ZT, Hibino K, Hotta N, Hu H, Hu HB, Huang J, Jia HY, Jiang L, Kajino F, Kasahara K, Katayose Y, Kato C, Kawata K, Labaciren, Le GM, Li AF, Li HJ, Li WJ, Liu C, Liu JS, Liu MY, Lu H, Meng XR, Mizutani K, Munakata K, Nanjo H, Nishizawa M, Ohnishi M, Ohta I, Onuma H, Ozawa S, Qian XL, Qu XB, Saito T, Saito TY, Sakata M, Sako TK, Shao J, Shibata M, Shiomi A, Shirai T, Sugimoto H, Takita M, Tan YH, Tateyama N, Torii S, Tsuchiya H, Udo S, Wang H, Wu HR, Xue L, Yamamoto Y, Yang Z, Yasue S, Yuan AF, Yuda T, Zhai LM, Zhang HM, Zhang JL, Zhang XY, Zhang Y, Zhang Y, Zhang Y, Zhaxisangzhu, and Zhou XX

Abstract

We report on a clear solar-cycle variation of the Sun’s shadow in the 10 TeV cosmic-ray flux observed by the Tibet air shower array during a full solar cycle from 1996 to 2009. In order to clarify the physical implications of the observed solar cycle variation, we develop numerical simulations of the Sun’s shadow, using the potential field source surface model and the current sheet source surface (CSSS) model for the coronal magnetic field. We find that the intensity deficit in the simulated Sun’s shadow is very sensitive to the coronal magnetic field structure, and the observed variation of the Sun’s shadow is better reproduced by the CSSS model. This is the first successful attempt to evaluate the coronal magnetic field models by using the Sun’s shadow observed in the TeV cosmic-ray flux.

Published
2013
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14. Ca-VII: a chain ordered host-guest structure of calcium above 210 GPa.

Author

Fujihisa H, Nakamoto Y, Sakata M, Shimizu K, Matsuoka T, Ohishi Y, Yamawaki H, Takeya S, and Gotoh Y

Abstract

The recently discovered high pressure phase VII of calcium [M. Sakata et al., Phys. Rev. B 83, 220512(R) (2011)] has the highest superconducting transition temperature (T(c)) of 29 K among all the elements. Understanding the cause for such a high T(c) state is necessary to clarify its crystal structure. The structure of this phase was determined by an x-ray powder diffraction experiment and a density functional theory calculation and was not found to be the usual host-guest type but consisted of a 2×2 supercell in the tetragonal ab plane with a commensurate host-guest ratio of 4/3 along the c axis containing 128 atoms.

Published
2013
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15. Observation by an air-shower array in Tibet of the multi-TeV cosmic-ray anisotropy due to terrestrial orbital motion around the Sun.

Author

Amenomori M, Ayabe S, Cui SW, Danzengluobu, Ding LK, Ding XH, Feng CF, Feng ZY, Gao XY, Geng QX, Guo HW, He HH, He M, Hibino K, Hotta N, Hu H, Hu HB, Huang J, Huang Q, Jia HY, Kajino F, Kasahara K, Katayose Y, Kato C, Kawata K, Labaciren, Le GM, Li JY, Lu H, Lu SL, Meng XR, Mizutani K, Mori S, Mu J, Munakata K, Nanjo H, Nishizawa M, Ohnishi M, Ohta I, Onuma H, Ouchi T, Ozawa S, Ren JR, Saito T, Sakata M, Sasaki T, Shibata M, Shiomi A, Shirai T, Sugimoto H, Takita M, Tan YH, Tateyama N, Torii S, Tsuchiya H, Udo S, Utsugi T, Wang BS, Wang H, Wang X, Wang YG, Wu HR, Xue L, Yamamoto Y, Yan CT, Yang XC, Yasue S, Ye ZH, Yu GC, Yuan AF, Yuda T, Zhang HM, Zhang JL, Zhang NJ, Zhang XY, Zhang Y, Zhaxisangzhu, and Zhou XX

Abstract

We report on the solar diurnal variation of the galactic cosmic-ray intensity observed by the Tibet III air shower array during the period from 1999 to 2003. In the higher-energy event samples (12 and 6.2 TeV), the variations are fairly consistent with the Compton-Getting anisotropy due to the terrestrial orbital motion around the Sun, while the variation in the lower-energy event sample (4.0 TeV) is inconsistent with this anisotropy. This suggests an additional anisotropy superposed at the multi-TeV energies, e.g., the solar modulation effect. This is the highest-precision measurement of the Compton-Getting anisotropy ever made.

Published
2004
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16. Charge ordering and spin frustration in AlV2-x CrxO4.

Author

Matsuno K, Katsufuji T, Mori S, Nohara M, Machida A, Moritomo Y, Kato K, Nishibori E, Takata M, Sakata M, Kitazawa K, and Takagi H

Abstract

The relationship between charge and spin degrees of freedom in a geometrically frustrated system, AlV2-xCrxO4 spinel, is investigated. Upon Cr doping, the charge-ordered phase of AlV2O4 is rapidly suppressed and a charge-disordered phase grows up instead. It is found that the magnetic ground state is a spin-glass state dominated by geometrical frustration for both phases, but larger spin entropy remains down to low temperatures in the charge-ordered phase, possibly owing to its two-dimensional character.

Published
2003
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17. Evidence for Pb-O covalency in tetragonal PbTiO3.

Author

Kuroiwa Y, Aoyagi S, Sawada A, Harada J, Nishibori E, Takata M, and Sakata M

Abstract

Accurate charge-density distributions of cubic and tetragonal PbTiO3 and BaTiO3 have been obtained by the MEM(maximum entropy method)/Rietveld analysis using synchrotron-radiation powder data. The Pb-O bonds in tetragonal PbTiO3 show rather strong covalency, while those in cubic PbTiO3 are ionic. This is the clear evidence of the Pb-O hybridization in tetragonal PbTiO3, which has been theoretically predicted as a key factor of much larger ferroelectricity of this substance than that of BaTiO3. Tetragonal PbTiO3 forms a layered structure of a two-dimensional covalent-bonding network consisting of the Ti-O5 pyramid.

Published
2001
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18. Search for steady emission of 10-TeV gamma rays from the Crab Nebula, Cygnus X-3, and Hercules X-1 using the Tibet air shower array.

Author

Amenomori M, Cao Z, Ding LK, Feng ZY, Hibino K, Hotta N, Huang Q, Huo AX, Jia HY, Jiang GZ, Jiao SQ, Kajino F, Kasahara K, Labaciren, Mei DM, Meng L, Meng XR, Mimaciren, Mizutani K, Mu J, Nanjo H, Nishizawa M, Nusang, Oguro A, Ohnishi M, Ohta I I, Ren JR, Saito T, Sakata M, Shi ZZ, Shibata M, Shirai T, Sugimoto H, Sun XX, Tai A, Taira K, Tan YH, Tateyama N, Torii S, Wang H, Wen CZ, Yamamoto Y, Yao XY, Yu GC, Yuan P, Yuda T, Zeng JG, Zhang CS, Zhang HM, Zhang L, Zhasang, Zhaxiciren, and Zhou WD

Published
1992
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19. Search for gamma rays from the supernova 1987A at energies greater than 100 TeV.

Author

Bond IA, Budding E, Conway MJ, Fenton KB, Fujii H, Fujii Z, Hasegawa H, Hayashida N, Honda M, Hotta N, Humble JE, Kabe S, Kasahara K, Kifune T, Masaike A, Matsubara Y, Mitsui K, Miura Y, Mori M, Murakami K, Muraki Y, Nagano M, Nakamura K, Nakamura T, Norris PM, Ohashi Y, Okada A, Saito T, Sakata M, Sato H, Shibata S, Shima M, Storey JR, Tanimori T, Teshima M, Torii S, Uchino K, Watase Y, Woodhams MD, Yamamoto Y, Yock PC, and Yuda T

Published
1988
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20. Search for TeV gamma rays from SN 1987A during December 1987 and January 1988.

Author

Bond IA, Budding E, Conway MJ, Fenton KB, Fujii H, Fujii Z, Fujimoto M, Hasegawa H, Hayashida N, Honda M, Hotta N, Humble JE, Kabe S, Kasahara K, Kifune T, Masaike A, Matsubara Y, Mitsui K, Miura Y, Mori M, Murakami K, Muraki Y, Nagano M, Nakamura K, Nakamura T, Norris PM, Ohashi Y, Okada A, Saito T, Sakata M, Sato H, Shibata S, Shima M, Storey JR, Tanimori T, Teshima M, Torii S, Uchino K, Watase Y, Woodhams MD, Yamamoto Y, Yock PC, and Yuda T

Published
1988
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