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Your search keyword '"Otani M"' showing total 8 results
Start Over Author "Otani M" Publisher escholarship, university of california
8 results on '"Otani M"'

1. 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, BD, Yoshida, H, Kozlov, A, Takemoto, Y, Yoshida, S, Fushimi, K, Banks, TI, Berger, BE, Fujikawa, BK, O'Donnell, T, Winslow, LA, Efremenko, Y, Karwowski, HJ, Markoff, DM, Tornow, W, Detwiler, JA, Enomoto, S, and Decowski, MP

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Clinical Research, Double-beta decay, Xe-136, Excited state, hep-ex, physics.ins-det, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Nuclear and plasma physics, Particle and high energy physics
Abstract

A search for double-beta decays of 136Xe to excited states of 136Ba has been performed with the first phase data set of the KamLAND-Zen experiment. The 01+, 21+ and 22+ transitions of 0νββ decay were evaluated in an exposure of 89.5 kg⋅yr of 136Xe, while the same transitions of 2νββ decay were evaluated in an exposure of 61.8 kg⋅yr. No excess over background was found for all decay modes. The lower half-life limits of the 21+ state transitions of 0νββ and 2νββ decay were improved to T1/20ν(0+→21+)>2.6×1025 yr and T1/22ν(0+→21+)>4.6×1023 yr (90% C.L.), respectively. We report on the first experimental lower half-life limits for the transitions to the 01+ state of 136Xe for 0νββ and 2νββ decay. They are T1/20ν(0+→01+)>2.4×1025 yr and T1/22ν(0+→01+)>8.3×1023 yr (90% C.L.). The transitions to the 22+ states are also evaluated for the first time to be T1/20ν(0+→22+)>2.6×1025 yr and T1/22ν(0+→22+)>9.0×1023 yr (90% C.L.). These results are compared to recent theoretical predictions.

Published
2016

2. 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

3. solar neutrino measurement with KamLAND

Author

Gando, A., Gando, Y., Hanakago, H., Ikeda, H., Inoue, K., Ishidoshiro, K., Ishikawa, H., Kishimoto, Y., Koga, M., Matsuda, R., Matsuda, S., Mitsui, T., Motoki, D., Nakajima, K., Nakamura, K., Obata, A., Oki, A., Oki, Y., Otani, M., Shimizu, I., Shirai, J., Suzuki, A., Tamae, K., Ueshima, K., Watanabe, H., Xu, B. D., Yamada, S., Yamauchi, Y., Yoshida, H., Kozlov, A., Takemoto, Y., Yoshida, S., Grant, C., Keefer, G., McKee, D. W., Piepke, A., Banks, T. I., Bloxham, T., Freedman, S. J., Fujikawa, B. K., Han, K., Hsu, L., Ichimura, K., Murayama, H., O'Donnell, T., Steiner, H. M., Winslow, L. A., Dwyer, D., Mauger, C., McKeown, R. D., Zhang, C., Berger, B. E., Lane, C. E., Maricic, J., Miletic, T., Learned, J. G., Sakai, M., Horton-Smith, G. A., Tang, A., Downum, K. E., Tolich, K., Efremenko, Y., Kamyshkov, Y., Perevozchikov, O., Karwowski, H. J., Markoff, D. M., Tornow, W., Detwiler, J. A., Enomoto, S., Heeger, K., and Decowski, M. P.

Published
2015

4. Be 7 solar neutrino measurement with KamLAND

Author

Gando, A, Gando, Y, Hanakago, H, Ikeda, H, Inoue, K, Ishidoshiro, K, Ishikawa, H, Kishimoto, Y, Koga, M, Matsuda, R, Matsuda, S, Mitsui, T, Motoki, D, Nakajima, K, Nakamura, K, Obata, A, Oki, A, Oki, Y, Otani, M, Shimizu, I, Shirai, J, Suzuki, A, Tamae, K, Ueshima, K, Watanabe, H, Xu, BD, Yamada, S, Yamauchi, Y, Yoshida, H, Kozlov, A, Takemoto, Y, Yoshida, S, Grant, C, Keefer, G, McKee, DW, Piepke, A, Banks, TI, Bloxham, T, Freedman, SJ, Fujikawa, BK, Han, K, Hsu, L, Ichimura, K, Murayama, H, O'Donnell, T, Steiner, HM, Winslow, LA, Dwyer, D, Mauger, C, McKeown, RD, Zhang, C, Berger, BE, Lane, CE, Maricic, J, Miletic, T, Learned, JG, Sakai, M, Horton-Smith, GA, Tang, A, Downum, KE, Tolich, K, Efremenko, Y, Kamyshkov, Y, Perevozchikov, O, Karwowski, HJ, Markoff, DM, Tornow, W, Detwiler, JA, Enomoto, S, Heeger, K, and Decowski, MP

Subjects
hep-ex, astro-ph.SR, nucl-ex, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

We report a measurement of the neutrino-electron elastic scattering rate of 862 keV Be7 solar neutrinos based on a 165.4 kt d exposure of KamLAND. The observed rate is 582±94(kt d)-1, which corresponds to an 862-keV Be7 solar neutrino flux of (3.26±0.52)×109cm-2s-1, assuming a pure electron-flavor flux. Comparing this flux with the standard solar model prediction and further assuming three-flavor mixing, a νe survival probability of 0.66±0.15 is determined from the KamLAND data. Utilizing a global three-flavor oscillation analysis, we obtain a total Be7 solar neutrino flux of (5.82±1.02)×109cm-2s-1, which is consistent with the standard solar model predictions.

Published
2015

5. Be7 solar neutrino measurement with KamLAND

Author

Gando, A, Gando, Y, Hanakago, H, Ikeda, H, Inoue, K, Ishidoshiro, K, Ishikawa, H, Kishimoto, Y, Koga, M, Matsuda, R, Matsuda, S, Mitsui, T, Motoki, D, Nakajima, K, Nakamura, K, Obata, A, Oki, A, Oki, Y, Otani, M, Shimizu, I, Shirai, J, Suzuki, A, Tamae, K, Ueshima, K, Watanabe, H, Xu, BD, Yamada, S, Yamauchi, Y, Yoshida, H, Kozlov, A, Takemoto, Y, Yoshida, S, Grant, C, Keefer, G, McKee, DW, Piepke, A, Banks, TI, Bloxham, T, Freedman, SJ, Fujikawa, BK, Han, K, Hsu, L, Ichimura, K, Murayama, H, O'Donnell, T, Steiner, HM, Winslow, LA, Dwyer, D, Mauger, C, McKeown, RD, Zhang, C, Berger, BE, Lane, CE, Maricic, J, Miletic, T, Learned, JG, Sakai, M, Horton-Smith, GA, Tang, A, Downum, KE, Tolich, K, Efremenko, Y, Kamyshkov, Y, Perevozchikov, O, Karwowski, HJ, Markoff, DM, Tornow, W, Detwiler, JA, Enomoto, S, Heeger, K, and Decowski, MP

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, astro-ph.SR, nucl-ex, Nuclear and plasma physics
Abstract

We report a measurement of the neutrino-electron elastic scattering rate of 862 keV Be7 solar neutrinos based on a 165.4 kt d exposure of KamLAND. The observed rate is 582±94(kt d)-1, which corresponds to an 862-keV Be7 solar neutrino flux of (3.26±0.52)×109cm-2s-1, assuming a pure electron-flavor flux. Comparing this flux with the standard solar model prediction and further assuming three-flavor mixing, a νe survival probability of 0.66±0.15 is determined from the KamLAND data. Utilizing a global three-flavor oscillation analysis, we obtain a total Be7 solar neutrino flux of (5.82±1.02)×109cm-2s-1, which is consistent with the standard solar model predictions.

Published
2015

6. CeLAND: search for a 4th light neutrino state with a 3 PBq 144Ce-144Pr electron antineutrino generator in KamLAND

Author

Gando, A, Gando, Y, Hayashida, S, Ikeda, H, Inoue, K, Ishidoshiro, K, Ishikawa, H, Koga, M, Matsuda, R, Matsuda, S, Mitsui, T, Motoki, D, Nakamura, K, Oki, Y, Otani, M, Shimizu, I, Shirai, J, Suekane, F, Suzuki, A, Takemoto, Y, Tamae, K, Ueshima, K, Watanabe, H, Xu, BD, Yamada, S, Yamauchi, Y, Yoshida, H, Cribier, M, Durero, M, Fischer, V, Gaffiot, J, Jonqueres, N, Kouchner, A, Lasserre, T, Leterme, D, Letourneau, A, Lhuillier, D, Mention, G, Rampal, G, Scola, L, Veyssiere, Ch, Vivier, M, Yala, P, Berger, BE, Kozlov, A, Banks, T, Dwyer, D, Fujikawa, BK, Han, K, Kolomensky, Yu G, Mei, Y, O'Donnell, T, Decowski, P, Markoff, DM, Yoshida, S, Kornoukhov, VN, Gelis, TVM, Tikhomirov, GV, Learned, JG, Maricic, J, Matsuno, S, Milincic, R, Karwowski, HJ, Efremenko, Y, Detwiler, A, and Enomoto, S

Subjects
physics.ins-det, hep-ex
Abstract

The reactor neutrino and gallium anomalies can be tested with a 3-4 PBq(75-100 kCi scale) 144Ce-144Pr antineutrino beta-source deployed at the centeror next to a large low-background liquid scintillator detector. Theantineutrino generator will be produced by the Russian reprocessing plant PAMayak as early as 2014, transported to Japan, and deployed in the KamiokaLiquid Scintillator Anti-Neutrino Detector (KamLAND) as early as 2015.KamLAND's 13 m diameter target volume provides a suitable environment tomeasure the energy and position dependence of the detected neutrino flux. Acharacteristic oscillation pattern would be visible for a baseline of about 10m or less, providing a very clean signal of neutrino disappearance into ayet-unknown, sterile neutrino state. This will provide a comprehensive test ofthe electron dissaperance neutrino anomalies and could lead to the discovery ofa 4th neutrino state for Delta_m^2 > 0.1 eV^2 and sin^2(2theta) > 0.05.

Published
2013

7. White paper: CeLAND - Investigation of the reactor antineutrino anomaly with an intense 144Ce-144Pr antineutrino source in KamLAND

Author

Gando, A, Gando, Y, Hayashida, S, Ikeda, H, Inoue, K, Ishidoshiro, K, Ishikawa, H, Koga, M, Matsuda, R, Matsuda, S, Mitsui, T, Motoki, D, Nakamura, K, Oki, Y, Otani, M, Shimizu, I, Shirai, J, Suekane, F, Suzuki, A, Takemoto, Y, Tamae, K, Ueshima, K, Watanabe, H, Xu, BD, Yamada, S, Yamauchi, Y, Yoshida, H, Banks, T, Berger, BE, Cribier, M, Decowski, P, Detwiler, JA, Durero, M, Dwyer, D, Efremenko, Y, Enomoto, S, Fischer, V, Fujikawa, BK, Gaffiot, J, Gelis, VM, Karwowski, HJ, Kolomensky, Yu G, Kozlov, A, Kornoukhov, VN, Lasserre, T, Learned, JG, Letourneau, A, Lhuillier, D, Maricic, J, Markoff, DM, Matsuno, S, Mention, G, Milincic, R, ODonnell, T, Saldikov, IS, Scola, L, Tikhomirov, GV, Veyssiere, Ch, Vivier, M, and Yoshida, S

Subjects
hep-ex
Abstract

We propose to test for short baseline neutrino oscillations, implied by therecent reevaluation of the reactor antineutrino flux and by anomalous resultsfrom the gallium solar neutrino detectors. The test will consist of producing a75 kCi 144Ce - 144Pr antineutrino source to be deployed in the Kamioka LiquidScintillator Anti-Neutrino Detector (KamLAND). KamLAND's 13m diameter targetvolume provides a suitable environment to measure energy and positiondependence of the detected neutrino flux. A characteristic oscillation patternwould be visible for a baseline of about 10 m or less, providing a very cleansignal of neutrino disappearance into a yet-unknown, "sterile" state. Such ameasurement will be free of any reactor-related uncertainties. After 1.5 yearsof data taking the Reactor Antineutrino Anomaly parameter space will be testedat > 95% C.L.

Published
2013

8. White paper: CeLAND - Investigation of the reactor antineutrino anomaly with an intense 144Ce-144Pr antineutrino source in KamLAND

Author

Gando, A, Gando, Y, Hayashida, S, Ikeda, H, Inoue, K, Ishidoshiro, K, Ishikawa, H, Koga, M, Matsuda, R, Matsuda, S, Mitsui, T, Motoki, D, Nakamura, K, Oki, Y, Otani, M, Shimizu, I, Shirai, J, Suekane, F, Suzuki, A, Takemoto, Y, Tamae, K, Ueshima, K, Watanabe, H, Xu, BD, Yamada, S, Yamauchi, Y, Yoshida, H, Banks, T, Berger, BE, Cribier, M, Decowski, P, Detwiler, JA, Durero, M, Dwyer, D, Efremenko, Y, Enomoto, S, Fischer, V, Fujikawa, BK, Gaffiot, J, Gelis, VM, Karwowski, HJ, Kolomensky, YG, Kozlov, A, Kornoukhov, VN, Lasserre, T, Learned, JG, Letourneau, A, Lhuillier, D, Maricic, J, Markoff, DM, Matsuno, S, Mention, G, Milincic, R, ODonnell, T, Saldikov, IS, Scola, L, Tikhomirov, GV, Veyssiere, C, Vivier, M, Yoshida, S, Gando, A, Gando, Y, Hayashida, S, Ikeda, H, Inoue, K, Ishidoshiro, K, Ishikawa, H, Koga, M, Matsuda, R, Matsuda, S, Mitsui, T, Motoki, D, Nakamura, K, Oki, Y, Otani, M, Shimizu, I, Shirai, J, Suekane, F, Suzuki, A, Takemoto, Y, Tamae, K, Ueshima, K, Watanabe, H, Xu, BD, Yamada, S, Yamauchi, Y, Yoshida, H, Banks, T, Berger, BE, Cribier, M, Decowski, P, Detwiler, JA, Durero, M, Dwyer, D, Efremenko, Y, Enomoto, S, Fischer, V, Fujikawa, BK, Gaffiot, J, Gelis, VM, Karwowski, HJ, Kolomensky, YG, Kozlov, A, Kornoukhov, VN, Lasserre, T, Learned, JG, Letourneau, A, Lhuillier, D, Maricic, J, Markoff, DM, Matsuno, S, Mention, G, Milincic, R, ODonnell, T, Saldikov, IS, Scola, L, Tikhomirov, GV, Veyssiere, C, Vivier, M, and Yoshida, S

Abstract

We propose to test for short baseline neutrino oscillations, implied by the recent reevaluation of the reactor antineutrino flux and by anomalous results from the gallium solar neutrino detectors. The test will consist of producing a 75 kCi 144Ce - 144Pr antineutrino source to be deployed in the Kamioka Liquid Scintillator Anti-Neutrino Detector (KamLAND). KamLAND's 13m diameter target volume provides a suitable environment to measure energy and position dependence of the detected neutrino flux. A characteristic oscillation pattern would be visible for a baseline of about 10 m or less, providing a very clean signal of neutrino disappearance into a yet-unknown, "sterile" state. Such a measurement will be free of any reactor-related uncertainties. After 1.5 years of data taking the Reactor Antineutrino Anomaly parameter space will be tested at > 95% C.L.

Published
2017

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