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841 results on '"Shimizu I"'

1. Plastic behaviour and forming limit during biaxial compressions of magnesium alloy AZ31 at room temperature

Author

Shimizu I. and Tada N.

Subjects
Physics, QC1-999
Abstract

The plastic behaviour and compressive fracture of AZ31 magnesium alloy were examined at room temperature. The uniaxial compression tests and biaxial compression tests along linear and nonlinear strain paths were carried out until fracture using a unique biaxial compression testing machine developed by author. The results revealed the evolution of plastic anisotropy in biaxial compressions, that is the strain path dependency of work hardening. The adaptability of several forming limit criteria to the compressive fracture of AZ31 alloy was discussed. It was found that the uniform estimation of compressive forming limits by uniaxial and biaxial compressions was difficult by Freudenthal criterion and Oyane criterion. The result of Tresca energy criterion suggested that the criterion based on shear stress has possibility to predict the compressive forming limits at room temperature of AZ31 alloy.

Published
2010
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2. KamLAND’s search for correlated low-energy electron antineutrinos with astrophysical neutrinos from IceCube

Author

Abe, S., Asami, S., Eizuka, M., Futagi, S., Gando, A., Gando, Y., Gima, T., Goto, A., Hachiya, T., Hata, K., Hosokawa, K., Ichimura, K., Ieki, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kawada, N., Kishimoto, Y., Kinoshita, T., Koga, M., Kurasawa, M., Maemura, N., Mitsui, T., Miyake, H., Nakahata, T., Nakamura, K., Nakamura, R., Ozaki, H., Sakai, T., Sambonsugi, H., Shimizu, I., Shirai, J., Shiraishi, K., Suzuki, A., Suzuki, Y., Takeuchi, A., Tamae, K., Watanabe, H., Yoshida, Y., Obara, S., Ichikawa, A.K., Yoshida, S., Umehara, S., Fushimi, K., Kotera, K., Urano, Y., Berger, B.E., Fujikawa, B.K., Learned, J.G., Maricic, J., Axani, S.N., Smolsky, J., Lertprasertpong, J., Winslow, L.A., Fu, Z., Ouellet, J., Efremenko, Y., Karwowski, H.J., Markoff, D.M., Tornow, W., Li, A., Detwiler, J.A., Enomoto, S., Decowski, M.P., Grant, C., Song, H., O’Donnell, T., and Dell’Oro, S.

Published
2022
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4. Search for charged excited states of dark matter with KamLAND-Zen

Author

Abe, S., Eizuka, M., Futagi, S., Gando, A., Gando, Y., Goto, S., Hachiya, T., Hata, K., Hosokawa, K., Ichimura, K., Ieki, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kawada, N., Kishimoto, Y., Koga, M., Kurasawa, M., Mitsui, T., Miyake, H., Morita, D., Nakahata, T., Nakajima, R., Nakamura, K., Nakamura, R., Nakane, J., Ozaki, H., Sakai, T., Shimizu, I., Shirai, J., Shiraishi, K., Shoji, R., Suzuki, A., Takeuchi, A., Tamae, K., Watanabe, H., Watanabe, K., Obara, S., Yoshida, S., Umehara, S., Fushimi, K., Kotera, K., Urano, Y., Ichikawa, A., Berger, B.E., Fujikawa, B.K., Learned, J.G., Maricic, J., Axani, S.N., Fu, Z., Smolsky, J., Winslow, L.A., Efremenko, Y., Karwowski, H.J., Markoff, D.M., Tornow, W., Dell'Oro, S., O'Donnell, T., Detwiler, J.A., Enomoto, S., Decowski, M.P., Weerman, K.M., Grant, C., Li, A., and Song, H.

Published
2024
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5. Search for double-beta decay of 136Xe to excited states of 136Ba with the KamLAND-Zen experiment

Author

Asakura, K., Gando, A., Gando, Y., Hachiya, T., Hayashida, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Ishikawa, T., Ishio, S., Koga, M., Matsuda, S., Mitsui, T., Motoki, D., Nakamura, K., Obara, S., Otani, M., Oura, T., Shimizu, I., Shirahata, Y., Shirai, J., Suzuki, A., Tachibana, H., Tamae, K., Ueshima, K., Watanabe, H., Xu, B.D., Yoshida, H., Kozlov, A., Takemoto, Y., Yoshida, S., Fushimi, K., Banks, T.I., Berger, B.E., Fujikawa, B.K., O'Donnell, T., Winslow, L.A., Efremenko, Y., Karwowski, H.J., Markoff, D.M., Tornow, W., Detwiler, J.A., Enomoto, S., and Decowski, M.P.

Published
2016
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6. A compact ultra-clean system for deploying radioactive sources inside the KamLAND detector

Author

Banks, T.I., Freedman, S.J., Wallig, J., Ybarrolaza, N., Gando, A., Gando, Y., Ikeda, H., Inoue, K., Kishimoto, Y., Koga, M., Mitsui, T., Nakamura, K., Shimizu, I., Shirai, J., Suzuki, A., Takemoto, Y., Tamae, K., Ueshima, K., Watanabe, H., Xu, B.D., Yoshida, H., Yoshida, S., Kozlov, A., Grant, C., Keefer, G., Piepke, A., Bloxham, T., Fujikawa, B.K., Han, K., Ichimura, K., Murayama, H., O׳Donnell, T., Steiner, H.M., Winslow, L.A., Dwyer, D.A., McKeown, R.D., Zhang, C., Berger, B.E., Lane, C.E., Maricic, J., Miletic, T., Batygov, M., Learned, J.G., Matsuno, S., Sakai, M., Horton-Smith, G.A., Downum, K.E., Gratta, G., Efremenko, Y., Perevozchikov, O., Karwowski, H.J., Markoff, D.M., Tornow, W., Heeger, K.M., Detwiler, J.A., Enomoto, S., and Decowski, M.P.

Published
2015
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7. Laboratory studies on the removal of radon-born lead from KamLAND׳s organic liquid scintillator

Author

Keefer, G., Grant, C., Piepke, A., Ebihara, T., Ikeda, H., Kishimoto, Y., Kibe, Y., Koseki, Y., Ogawa, M., Shirai, J., Takeuchi, S., Mauger, C., Zhang, C., Schweitzer, G., Berger, B.E., Dazeley, S., Decowski, M.P., Detwiler, J.A., Djurcic, Z., Dwyer, D.A., Efremenko, Y., Enomoto, S., Freedman, S.J., Fujikawa, B.K., Furuno, K., Gando, A., Gando, Y., Gratta, G., Hatakeyama, S., Heeger, K.M., Hsu, L., Ichimura, K., Inoue, K., Iwamoto, T., Kamyshkov, Y., Karwowski, H.J., Koga, M., Kozlov, A., Lane, C.E., Learned, J.G., Maricic, J., Markoff, D.M., Matsuno, S., McKee, D., McKeown, R.D., Miletic, T., Mitsui, T., Motoki, M., Nakajima, Kyo, Nakajima, Kyohei, Nakamura, K., O׳Donnell, T., Ogawa, H., Piquemal, F., Ricol, J.-S., Shimizu, I., Suekane, F., Suzuki, A., Svoboda, R., Tajima, O., Takemoto, Y., Tamae, K., Tolich, K., Tornow, W., Watanabe, Hideki, Watanabe, Hiroko, Winslow, L.A., and Yoshida, S.

Published
2015
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8. First measurement of the strange axial coupling constant using neutral-current quasielastic interactions of atmospheric neutrinos at KamLAND

Author

KamLAND Collaboration, Abe, S., Asami, S., Eizuka, M., Futagi, S., Gando, A., Gando, Y., Gima, T., Goto, A., Hachiya, T., Hata, K., Ichimura, K., Ieki, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kawada, N., Kishimoto, Y., Koga, M., Kurasawa, M., Mitsui, T., Miyake, H., Nakahata, T., Nakamura, K., Nakamura, R., Ozaki, H., Sakai, T., Shimizu, I., Shirai, J., Shiraishi, K., Suzuki, A., Suzuki, Y., Takeuchi, A., Tamae, K., Watanabe, H., Yoshida, Y., Obara, S., Ichikawa, A. K., Yoshida, S., Umehara, S., Fushimi, K., Kotera, K., Urano, Y., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Axani, S. N., Fu, Z., Smolsky, J., Winslow, L. A., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Detwiler, J. A., Enomoto, S., Decowski, M. P., Grant, C., Li, A., Song, H., Dell'Oro, S., and O'Donnell, T.

Subjects
High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics - Experiment
Abstract

We report a measurement of the strange axial coupling constant $g_A^s$ using atmospheric neutrino data at KamLAND. This constant is a component of the axial form factor of the neutral-current quasielastic (NCQE) interaction. The value of $g_A^s$ significantly changes the ratio of proton and neutron NCQE cross sections. KamLAND is suitable for measuring NCQE interactions as it can detect nucleon recoils with low-energy thresholds and measure neutron multiplicity with high efficiency. KamLAND data, including the information on neutron multiplicity associated with the NCQE interactions, makes it possible to measure $g_A^s$ with a suppressed dependence on the axial mass $M_A$, which has not yet been determined. For a comprehensive prediction of the neutron emission associated with neutrino interactions, we establish a simulation of particle emission via nuclear deexcitation of $^{12}$C, a process not considered in existing neutrino Monte Carlo event generators. Energy spectrum fitting for each neutron multiplicity gives $g_A^s =-0.14^{+0.25}_{-0.26}$, which is the most stringent limit obtained using NCQE interactions without $M_A$ constraints. The two-body current contribution considered in this analysis relies on a theoretically effective model and electron scattering experiments and requires future verification by direct measurements and future model improvement.

Published
2022

10. Abundances of Uranium and Thorium Elements in Earth Estimated by Geoneutrino Spectroscopy

Author

Abe, S, Asami, S, Eizuka, M, Futagi, S, Gando, A, Gando, Y, Gima, T, Goto, A, Hachiya, T, Hata, K, Hosokawa, K, Ichimura, K, Ieki, S, Ikeda, H, Inoue, K, Ishidoshiro, K, Kamei, Y, Kawada, N, Kishimoto, Y, Koga, M, Kurasawa, M, Maemura, N, Mitsui, T, Miyake, H, Nakahata, T, Nakamura, K, Nakamura, R, Ozaki, H, Sakai, T, Sambonsugi, H, Shimizu, I, Shirahata, Y, Shirai, J, Shiraishi, K, Suzuki, A, Suzuki, Y, Takeuchi, A, Tamae, K, Watanabe, H, Yoshida, Y, Obara, S, Ichikawa, AK, Yoshida, S, Umehara, S, Fushimi, K, Kotera, K, Urano, Y, Berger, BE, Fujikawa, BK, Learned, JG, Maricic, J, Axani, SN, Fu, Z, Smolsky, J, Winslow, LA, Efremenko, Y, Karwowski, HJ, Markoff, DM, Tornow, W, Li, A, Detwiler, JA, Enomoto, S, Decowski, MP, Grant, C, Song, H, O’Donnell, T, and Dell’Oro, S

Subjects
Physics - Geophysics, High Energy Physics - Experiment (hep-ex), Geophysics, Affordable and Clean Energy, geoneutrino, mantle composition, General Earth and Planetary Sciences, Meteorology & Atmospheric Sciences, FOS: Physical sciences, Earth's interior, radiogenic heat, High Energy Physics - Experiment, Geophysics (physics.geo-ph)
Abstract

The decay of the primordial isotopes $^{238}\mathrm{U}$, $^{235}\mathrm{U}$, $^{232}\mathrm{Th}$, and $^{40}\mathrm{K}$ have contributed to the terrestrial heat budget throughout the Earth's history. Hence the individual abundance of those isotopes are key parameters in reconstructing contemporary Earth model. The geoneutrinos produced by the radioactive decays of uranium and thorium have been observed with the Kamioka Liquid-Scintillator Antineutrino Detector (KamLAND). Those measurements have been improved with more than 18-year observation time, and improvements in detector background levels mainly by an 8-year almost rector-free period now permit spectroscopy with geoneutrinos. Our results yield the first constraint on both uranium and thorium heat contributions. Herein the KamLAND result is consistent with geochemical estimations based on elemental abundances of chondritic meteorites and mantle peridotites. The High-Q model is disfavored at 99.76% C.L. and a fully radiogenic model is excluded at 5.2$\sigma$ assuming a homogeneous heat producing element distribution in the mantle., Comment: 13 pages, 2 figures, accepted for publication in Geophysical Research Letters on Aug 4th, 2022

Published
2022

11. Search for the Majorana Nature of Neutrinos in the Inverted Mass Ordering Region with KamLAND-Zen

Author

Zen Collaboration, Abe, S., Asami, S., Eizuka, M., Futagi, S., Gando, A., Gando, Y., Gima, T., Goto, A., Hachiya, T., Hata, K., Hayashida, S., Hosokawa, K., Ichimura, K., Ieki, S., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kawada, N., Kishimoto, Y., Koga, M., Kurasawa, M., Maemura, N., Mitsui, T., Miyake, H., Nakahata, T., Nakamura, K., Nakamura, R., Ozaki, H., Sakai, T., Sambonsugi, H., Shimizu, I., Shirai, J., Shiraishi, K., Suzuki, A., Suzuki, Y., Takeuchi, A., Tamae, K., Ueshima, K., Watanabe, H., Yoshida, Y., Obara, S., Ichikawa, A. K., Chernyak, D., Kozlov, A., Nakamura, K. Z., Yoshida, S., Takemoto, Y., Umehara, S., Fushimi, K., Kotera, K., Urano, Y., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Axani, S. N., Smolsky, J., Fu, Z., Winslow, L. A., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Dell'Oro, S., O'Donnell, T., Detwiler, J. A., Enomoto, S., Decowski, M. P., Grant, C., Li, A., and Song, H.

Subjects
High Energy Physics - Experiment (hep-ex), General Physics, KamLAND-Zen Collaboration, Engineering, Physics - Instrumentation and Detectors, Physical Sciences, FOS: Physical sciences, General Physics and Astronomy, Instrumentation and Detectors (physics.ins-det), Mathematical Sciences, High Energy Physics - Experiment
Abstract

The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta ($0\nu\beta\beta$) decay half-life in $^{136}$Xe using a xenon-loaded liquid scintillator. We report an improved search using an upgraded detector with almost double the amount of xenon and an ultralow radioactivity container, corresponding to an exposure of 970 kg yr of $^{136}$Xe. These new data provide valuable insight into backgrounds, especially from cosmic muon spallation of xenon, and have required the use of novel background rejection techniques. We obtain a lower limit for the $0\nu\beta\beta$ decay half-life of $T_{1/2}^{0\nu} > 2.3 \times 10^{26}$ yr at 90% C.L., corresponding to upper limits on the effective Majorana neutrino mass of 36-156 meV using commonly adopted nuclear matrix element calculations., Comment: 7 pages, 3 figures

Published
2022

19. Experimental investigation of geologically produced antineutrinos with KamLAND

Author

Araki, T., Enomoto, S., Furuno, K., Gando, Y., Ichimura, K., Ikeda, H., Inoue, K., Kishimoto, Y., Koga, M., Koseki, Y., Maeda, T., Mitsui, T., Motoki, M., Nakajima, K., Ogawa, H., Ogawa, M., Owada, K., Ricol, J.-S., Shimizu, I., Shirai, J., Suekane, F., Suzuki, A., Tada, K., Takeuchi, S., Tamae, K., Tsuda, Y., Watanabe, H., Busenitz, J., Classen, T., Djurcic, Z., Keefer, G., Leonard, D., Piepke, A., Yakushev, E., Berger, B. E., Chan, Y. D., Decowski, M. P., Dwyer, D. A., Freedman, S. J., Fujikawa, B. K., Goldman, J., Gray, F., Heeger, K. M., Hsu, L., Lesko, K. T., Luk, K.-B., Murayama, H., O'Donnell, T., Poon, A. W. P., Steiner, H. M., Winslow, L. A., Mauger, C., McKeown, R. D., Vogel, P., Lane, C. E., Miletic, T., Guillian, G., Learned, J. G., Maricic, J., Matsuno, S., Pakvasa, S., Horton-Smith, G. A., Dazeley, S., Hatakeyama, S., Rojas, A., Svoboda, R., Dieterle, B. D., Detwiler, J., Gratta, G., Ishii, K., Tolich, N., Uchida, Y., Batygov, M., Bugg, W., Efremenko, Y., Kamyshkov, Y., Kozlov, A., Nakamura, Y., Karwowski, H. J., Markoff, D. M., Nakamura, K., Rohm, R. M., Tornow, W., Wendell, R., Chen, M.-J., Wang, Y.-F., and Piquemal, F.

Published
2005
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44. Precision Analysis of the <math><mrow><mmultiscripts><mrow><mi>Xe</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>136</mn></mrow></mmultiscripts></mrow></math> Two-Neutrino <math><mi>β</mi><mi>β</mi></math> Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements

Author

Gando, A., Gando, Y., Hachiya, T., Ha Minh, M., Hayashida, S., Honda, Y., Hosokawa, K., Ikeda, H., Inoue, K., Ishidoshiro, K., Kamei, Y., Kamizawa, K., Kinoshita, T., Koga, M., Matsuda, S., Mitsui, T., Nakamura, K., Ono, A., Ota, N., Otsuka, S., Ozaki, H., Shibukawa, Y., Shimizu, I., Shirahata, Y., Shirai, J., Sato, T., Soma, K., Suzuki, A., Takeuchi, A., Tamae, K., Ueshima, K., Watanabe, H., Chernyak, D., Kozlov, A., Obara, S., Yoshida, S., Takemoto, Y., Umehara, S., Fushimi, K., Hirata, S., Berger, B. E., Fujikawa, B. K., Learned, J. G., Maricic, J., Winslow, L. A., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., O’Donnell, T., Detwiler, J. A., Enomoto, S., Decowski, M. P., Menéndez, J., Dvornický, R., and Šimkovic, F.

Abstract

We present a precision analysis of the Xe136 two-neutrino ββ electron spectrum above 0.8 MeV, based on high-statistics data obtained with the KamLAND-Zen experiment. An improved formalism for the two-neutrino ββ rate allows us to measure the ratio of the leading and subleading 2νββ nuclear matrix elements (NMEs), ξ312ν=−0.26−0.25+0.31. Theoretical predictions from the nuclear shell model and the majority of the quasiparticle random-phase approximation (QRPA) calculations are consistent with the experimental limit. However, part of the ξ312ν range allowed by the QRPA is excluded by the present measurement at the 90% confidence level. Our analysis reveals that predicted ξ312ν values are sensitive to the quenching of NMEs and the competing contributions from low- and high-energy states in the intermediate nucleus. Because these aspects are also at play in neutrinoless ββ decay, ξ312ν provides new insights toward reliable neutrinoless ββ NMEs.

Published
2019

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