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1. Measurement of cosmic-ray muon spallation products in a xenon-loaded liquid scintillator with KamLAND

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., 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., Dell'Oro, S., O'Donnell, T., Detwiler, J.A., Enomoto, S., Decowski, M.P., Weerman, K.M., Grant, C., Li, A., and Song, H.

Subjects
Particle and Plasma Physics, Molecular, Nuclear, Atomic, Nuclear & Particles Physics
Abstract

Cosmic-ray muons produce various radioisotopes when passing through material. These spallation products can be backgrounds for rare event searches such as in solar neutrino, double-β decay, and dark matter search experiments. The KamLAND-Zen experiment searches for neutrinoless double-β decay in 745 kg of xenon dissolved in liquid scintillator. The experiment includes dead-time-free electronics with a high efficiency for detecting muon-induced neutrons. The production yields of different radioisotopes are measured with a combination of delayed coincidence techniques, newly developed muon reconstruction, and xenon spallation identification methods. The observed xenon spallation products are consistent with results from the fluka and geant4 simulation codes.

Published
2023

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

Author

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
Quantum Physics, Particle and Plasma Physics, Molecular, Nuclear, Atomic, Nuclear & Particles Physics, Astronomical and Space Sciences
Abstract

We report a measurement of the strange axial coupling constant gAs 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 gAs 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 gAs with a suppressed dependence on the axial mass MA, 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 C12, a process not considered in existing neutrino Monte Carlo event generators. Energy spectrum fitting for each neutron multiplicity gives gAs=−0.14−0.26+0.25, which is the most stringent limit obtained using NCQE interactions without MA 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
2023

3. The nylon balloon for xenon loaded liquid scintillator in KamLAND-Zen 800 neutrinoless double-beta decay search experiment

Author

Gando, Y, Gando, A, Hachiya, T, Hayashida, S, Hosokawa, K, Ikeda, H, Mitsui, T, Nakada, T, Obara, S, Ozaki, H, Shirai, J, Ueshima, K, Watanabe, H, Abe, S, Hata, K, Hayashi, A, Honda, Y, Ieki, S, Inoue, K, Ishidoshiro, K, Ishikawa, S, Kamei, Y, Kamizawa, K, Karino, Y, Kawada, N, Kinoshita, T, Koga, M, Matsuda, S, Miyake, H, Nakamura, K, Nemoto, K, Ono, A, Ota, N, Otsuka, S, Shibukawa, Y, Shimizu, I, Shirahata, Y, Soma, K, Suzuki, A, Suzuki, AA, Takai, T, Takeuchi, A, Tamae, K, Teraoka, Y, Wada, Y, Chernyak, D, Kozlov, A, Yoshida, S, Umehara, S, Takemoto, Y, Fushimi, K, Hirata, S, Grant, C, Li, A, Learned, JG, Maricic, J, Berger, BE, Fujikawa, BK, Fraker, S, Herman, A, Krupczak, E, Pease, GL, Winslow, LA, Efremenko, Y, Karwowski, HJ, Markoff, DM, Tornow, W, O'Donnell, T, Dell'oro, S, Detwiler, JA, Enomoto, S, and Decowski, MP

Subjects
Liquid detectors, Engineering, Physics::Instrumentation and Detectors, Large detector systems for particle and astroparticle physics, Physical Sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Double-beta decay detectors, Nuclear & Particles Physics, Physics::Geophysics
Abstract

The KamLAND-Zen 800 experiment is searching for the neutrinoless double-beta decay of 136Xe by using 136Xe-loaded liquid scintillator. The liquid scintillator is enclosed inside a balloon made of thin, transparent, low-radioactivity film that we call Inner Balloon (IB). The IB, apart from guaranteeing the liquid containment, also allows to minimize the background from cosmogenic muon-spallation products and 8B solar neutrinos. Indeed these events could contribute to the total counts in the region of interest around the Q-value of the double-beta decay of 136Xe. In this paper, we present an overview of the IB and describe the various steps of its commissioning minimizing the radioactive contaminations, from the material selection, to the fabrication of the balloon and its installation inside the KamLAND detector. Finally, we show the impact of the IB on the KamLAND background as measured by the KamLAND detector itself.

Published
2021

4. Precision Analysis of the ^{136}Xe Two-Neutrino ββ 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, BE, Fujikawa, BK, Learned, JG, Maricic, J, Winslow, LA, Efremenko, Y, Karwowski, HJ, Markoff, DM, Tornow, W, O'Donnell, T, Detwiler, JA, Enomoto, S, Decowski, MP, Menéndez, J, Dvornický, R, Šimkovic, F, and KamLAND-Zen Collaboration

Subjects
General Physics, KamLAND-Zen Collaboration, Engineering, nucl-th, hep-ex, Physical Sciences, nucl-ex, Mathematical Sciences
Abstract

We present a precision analysis of the ^{136}Xe two-neutrino ββ electron spectrum above 0.8MeV, 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), ξ_{31}^{2ν}=-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 ξ_{31}^{2ν} range allowed by the QRPA is excluded by the present measurement at the 90%confidence level. Our analysis reveals that predicted ξ_{31}^{2ν} 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, ξ_{31}^{2ν} provides new insights toward reliable neutrinoless ββ NMEs.

Published
2019

5. Precision Analysis of the ^{136}Xe Two-Neutrino ββ Spectrum in KamLAND-Zen and Its Impact on the Quenching of Nuclear Matrix Elements

Author

Gando, A., Gando, Y., Hachiya, T., Minh, M. Ha, 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, Ken-Ichi, 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 ^{136}Xe 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), ξ_{31}^{2ν}=-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 ξ_{31}^{2ν} range allowed by the QRPA is excluded by the present measurement at the 90% confidence level. Our analysis reveals that predicted ξ_{31}^{2ν} 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, ξ_{31}^{2ν} provides new insights toward reliable neutrinoless ββ NMEs.

Published
2019

6. A Search for Electron Antineutrinos Associated with Gravitational-wave Events GW150914 and GW151226 Using KamLAND (vol 829, L34, 2016)

Author

Gando, A, Gando, Y, Hachiya, T, Hayashi, A, Hayashida, S, Ikeda, H, Inoue, K, Ishidoshiro, K, Karino, Y, Koga, M, Matsuda, S, Mitsui, T, Nakamura, K, Obara, S, Oura, T, Ozaki, H, Shimizu, I, Shirahata, Y, Shirai, J, Suzuki, A, Takai, T, Tamae, K, Teraoka, Y, Ueshima, K, Watanabe, H, Kozlov, A, Takemoto, Y, Yoshida, S, Fushimi, K, Piepke, A, Banks, TI, Berger, BE, Fujikawa, BK, O'Donnell, T, Learned, JG, Maricic, J, Sakai, M, Winslow, LA, Krupczak, E, Ouellet, J, Efremenko, Y, Karwowski, HJ, Markoff, DM, Tornow, W, Detwiler, JA, Enomoto, S, Decowski, MP, and Collaboration, K

Subjects
Astronomy & Astrophysics, Astronomical and Space Sciences
Published
2017

7. Publisher's Note: Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen [Phys. Rev. Lett. 117, 082503 (2016)]

Author

Gando, A, Gando, Y, Hachiya, T, Hayashi, A, Hayashida, S, Ikeda, H, Inoue, K, Ishidoshiro, K, Karino, Y, Koga, M, Matsuda, S, Mitsui, T, Nakamura, K, Obara, S, Oura, T, Ozaki, H, Shimizu, I, Shirahata, Y, Shirai, J, Suzuki, A, Takai, T, Tamae, K, Teraoka, Y, Ueshima, K, Watanabe, 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, Decowski, MP, and KamLAND-Zen Collaboration

Subjects
General Physics, Engineering, KamLAND-Zen Collaboration, Physical Sciences, Mathematical Sciences
Abstract

This corrects the article DOI: 10.1103/PhysRevLett.117.082503.

Published
2016

8. Search for Majorana Neutrinos Near the Inverted Mass Hierarchy Region with KamLAND-Zen

Author

Gando, A, Gando, Y, Hachiya, T, Hayashi, A, Hayashida, S, Ikeda, H, Inoue, K, Ishidoshiro, K, Karino, Y, Koga, M, Matsuda, S, Mitsui, T, Nakamura, K, Obara, S, Oura, T, Ozaki, H, Shimizu, I, Shirahata, Y, Shirai, J, Suzuki, A, Takai, T, Tamae, K, Teraoka, Y, Ueshima, K, Watanabe, 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, Decowski, MP, and KamLAND-Zen Collaboration

Subjects
General Physics, Engineering, KamLAND-Zen Collaboration, hep-ex, Physical Sciences, nucl-ex, physics.ins-det, Mathematical Sciences
Abstract

We present an improved search for neutrinoless double-beta (0νββ) decay of ^{136}Xe in the KamLAND-Zen experiment. Owing to purification of the xenon-loaded liquid scintillator, we achieved a significant reduction of the ^{110m}Ag contaminant identified in previous searches. Combining the results from the first and second phase, we obtain a lower limit for the 0νββ decay half-life of T_{1/2}^{0ν}>1.07×10^{26} yr at 90%C.L., an almost sixfold improvement over previous limits. Using commonly adopted nuclear matrix element calculations, the corresponding upper limits on the effective Majorana neutrino mass are in the range 61-165meV. For the most optimistic nuclear matrix elements, this limit reaches the bottom of the quasidegenerate neutrino mass region.

Published
2016

9. 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
astro-ph.SR, Particle and Plasma Physics, hep-ex, Molecular, Nuclear, nucl-ex, Atomic, Nuclear & Particles 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

10. 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, B. D., Yamada, S., Yamauchi, Y., Yoshida, H., Banks, T., Berger, B. E., Cribier, M., Decowski, P., Detwiler, J. A., Durero, M., Dwyer, D., Efremenko, Y., Enomoto, S., Fischer, V., Fujikawa, B. K., Gaffiot, J., Gelis, V. M., Karwowski, H. J., Kolomensky, Yu. G., Kozlov, A., Kornoukhov, V. N., Lasserre, T., Learned, J. G., Letourneau, A., Lhuillier, D., Maricic, J., Markoff, D. M., Matsuno, S., Mention, G., Milincic, R., ODonnell, T., Saldikov, I. S., Scola, L., Tikhomirov, G. V., Veyssiere, Ch., Vivier, M., and Yoshida, S.

Subjects
High Energy Physics - Experiment (hep-ex), hep-ex, Physics::Instrumentation and Detectors, FOS: Physical sciences, High Energy Physics::Experiment, High Energy Physics - Experiment, Physics::Geophysics
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., White paper prepared for Snowmass-2013; slightly different author list

Published
2013
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11. 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, B. D., Yamada, S., Yamauchi, Y., Yoshida, H., Cribier, M., Durero, M., Vincent Fischer, 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, B. E., Kozlov, A., Banks, T., Dwyer, D., Fujikawa, B. K., Han, K., Kolomensky, Yu G., Mei, Y., O Donnell, T., Decowski, P., Markoff, D. M., Yoshida, S., Kornoukhov, V. N., Gelis, T. V. M., Tikhomirov, G. V., Learned, J. G., Maricic, J., Matsuno, S., Milincic, R., Karwowski, H. J., Efremenko, Y., Detwiler, A., and Enomoto, S.

Subjects
High Energy Physics - Experiment (hep-ex), Physics - Instrumentation and Detectors, hep-ex, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), physics.ins-det, High Energy Physics - Experiment
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 center or next to a large low-background liquid scintillator detector. The antineutrino generator will be produced by the Russian reprocessing plant PA Mayak as early as 2014, transported to Japan, and deployed in the Kamioka Liquid Scintillator Anti-Neutrino Detector (KamLAND) as early as 2015. KamLAND's 13 m diameter target volume provides a suitable environment to measure the 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 neutrino state. This will provide a comprehensive test of the electron dissaperance neutrino anomalies and could lead to the discovery of a 4th neutrino state for Delta_m^2 > 0.1 eV^2 and sin^2(2theta) > 0.05., 67 pages, 50 figures. Th. Lasserre thanks the European Research Council for support under the Starting Grant StG-307184

Published
2013
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12. Limit on neutrinoless ββ decay of 136Xe from the first phase of KamLAND-Zen and comparison with the positive claim in 76Ge

Author

Gando, A., Gando, Y., Hanakago, H., Ikeda, H., Inoue, K., Ishidoshiro, K., Kato, R., Koga, M., Matsuda, S., Mitsui, T., Motoki, D., Nakada, T., Nakamura, K., Obata, A., Oki, A., Ono, Y., Otani, M., Shimizu, I., Shirai, J., Suzuki, A., Takemoto, Y., Tamae, K., Ueshima, K., Watanabe, H., Xu, B.D., Yamada, S., Yoshida, H., Kozlov, A., Yoshida, S., Banks, T.I., Freedman, S.J., Fujikawa, B.K., Han, K., O’Donnell, T., Berger, B.E., Efremenko, Y., Karwowski, H.J., Markoff, D.M., Tornow, W., Detwiler, J.A., Enomoto, S., Decowski, M.P., and Astroparticle Physics (IHEF, IoP, FNWI)

Abstract

We present results from the first phase of the KamLAND-Zen double-beta decay experiment, corresponding to an exposure of 89.5 kg yr of (136)Xe. We obtain a lower limit for the neutrinoless double-beta decay half-life of T(1/2)(0ν)1.9×10(25) yr at 90% C.L. The combined results from KamLAND-Zen and EXO-200 give T(1/2)(0ν)3.4×10(25) yr at 90% C.L., which corresponds to a Majorana neutrino mass limit ofm(ββ)(120-250) meV based on a representative range of available matrix element calculations. Using those calculations, this result excludes the Majorana neutrino mass range expected from the neutrinoless double-beta decay detection claim in (76)Ge, reported by a part of the Heidelberg-Moscow Collaboration, at more than 97.5% C.L.

Published
2012

13. Limits on Majoron-emitting double-beta decays of Xe-136 in the KamLAND-Zen experiment

Author

Collaboration, KamLAND-Zen, Gando, A., Gando, Y., Hanakago, H., Ikeda, H., Inoue, K., Kato, R., Koga, M., Matsuda, S., Mitsui, T., Nakada, T., Nakamura, K., Obata, A., Oki, A., Ono, Y., Shimizu, I., Shirai, J., Suzuki, A., Takemoto, Y., Tamae, K., Ueshima, K., Watanabe, H., Xu, B. D., Yamada, S., Yoshida, H., Kozlov, A., Yoshida, S., Banks, T. I., Detwiler, J. A., Freedman, S. J., Fujikawa, B. K., Han, K., O'Donnell, T., Berger, B. E., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., Enomoto, S., and Decowski, M. P.

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

We present limits on Majoron-emitting neutrinoless double-beta decay modes based on an exposure of 112.3 days with 125 kg of Xe-136. In particular, a lower limit on the ordinary (spectral index n = 1) Majoron-emitting decay half-life of Xe-136 is obtained as T_{1/2}^{0\nu\chi^{0}} > 2.6 x 10^{24} yr at 90% C.L., a factor of five more stringent than previous limits. The corresponding upper limit on the effective Majoron-neutrino coupling, using a range of available nuclear matrix calculations, is < (0.8 - 1.6) x 10^{-5}. This excludes a previously unconstrained region of parameter space and strongly limits the possible contribution of ordinary Majoron emission modes to 0\nu\beta\beta decay for neutrino masses in the inverted hierarchy scheme., Comment: 4 pages, 3 figures (1 figure added). Published version in PRC rapid communication

Published
2012
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14. Solar neutrino measurements in Super-Kamiokande-I

Author

Hosaka, J., Ishihara, K., Kameda, J., Koshio, Y., Minamino, A., Mitsuda, C., Miura, M., Moriyama, S., Nakahata, M., Namba, T., Obayashi, Y., Koshiba, M., Kielczewska, D., Zalipska, J., Berns, H. G., Gran, R., Shiraishi, K. K., Stachyra, A. L., Shiozawa, M., Washburnand, K., Wilkes, R. J., Casper, D., Suzuki, Y., Takeuchi, Y., Yamada, S., Higuchi, I., Ishitsuka, M., Kajita, T., Kaneyuki, K., Mitsuka, G., Nakayama, S., Nishino, H., Cravens, J. P., Okada, A., Okumura, K., Saji, C., Takenaga, Y., Clark, S., Desai, S., Kearns, E., Likhoded, S., Stone, J. L., Sulak, L. R., Kropp, W. R., Wang, W., Goldhaber, M., Liu, D. W., Mine, S., Smy, M. B., Sobel, H. W., Sterner, C. W., Vagins, M. R., Ganezer, K. S., Nitta, K., Hill, J., Keig, W. E., Jang, J. S., Kim, J. Y., Lim, I. T., Scholberg, K., Walter, C. W., Ellsworth, R. W., Tasaka, S., Guillian, G., Oyama, Y., Kibayashi, A., Learned, J. G., Matsuno, S., Messier, M. D., Hayato, Y., Ichikawa, A. K., Ishida, T., Ishii, T., Iwashita, T., Kobayashi, T., Totsuka, Y., Nakadaira, T., Nakamura, K., Suzuki, A. T., Hasegawa, M., Kato, I., Maesaka, H., Nakaya, T., Nishikawa, K., Sasaki, T., Martens, K., Sato, H., Yamamoto, S., Yokoyama, M., Haines, T. J., Dazeley, S., Kim, B. K., Lee, K. B., Hatakeyama, S., Svoboda, R., Blaufuss, E., Mauger, C., Goodman, J. A., Sullivan, G. W., Turcan, D., Cooley, J., Habig, A., Fukuda, Y., Sato, T., Itow, Y., Jung, C. K., Kato, T., McGrew, C., Kobayashi, K., Malek, M., Sharkey, E., Yanagisawa, C., Tamura, N., Sakuda, M., Kuno, Y., Yoshida, M., Kim, S. B., Sakurai, N., Yoo, J., Okazawa, H., Ishizuka, T., Choi, Y., Seo, H. K., Gando, Y., Hasegawa, T., Inoue, K., Shirai, J., Suzuki, A., Sarrat, A., Nishijima, K., Ishino, H., and Watanabe, Y.

Subjects
Nuclear and High Energy Physics, Tamura, Norio, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Physics::Space Physics, High Energy Physics::Phenomenology, High Energy Physics::Experiment, 田村, 詔生, High Energy Physics - Experiment
Abstract

The details of Super--Kamiokande--I's solar neutrino analysis are given. Solar neutrino measurement in Super--Kamiokande is a high statistics collection of $^8$B solar neutrinos via neutrino-electron scattering. The analysis method and results of the 1496 day data sample are presented. The final oscillation results for the data are also presented., Comment: 32pages, 57figures, submitted to Physical Review D

Published
2006

15. Search for anti-electron-neutrinos from the Sun at Super-Kamiokande-I

Author

Kamiokande Collaboration and Gando, Y.

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

We present the results of a search for low energy $\bar��_e$ from the Sun using 1496 days of data from Super-Kamiokande-I. We observe no significant excess of events and set an upper limit for the conversion probability to $\bar��_e$ of the $^8$B solar neutrino. This conversion limit is 0.8% (90% C.L.) of the standard solar model's neutrino flux for total energy = 8 MeV -- 20 MeV. We also set a flux limit for monochromatic $\bar��_e$ for $E_{\bar��_e}$ = 10 MeV -- 17 MeV., 5 pages(LaTex), 5 figures, submitted to Phys. Rev. Letters

Published
2002
Full Text
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16. Search for supernova neutrino bursts at super-kamiokande

Author

Ikeda, M., Takeda, A., Fukuda, Y., Vagins, MR, Abe, K., Iida, T., Ishihara, K., Kameda, J., Koshio, Y., Minamino, A., Mitsuda, C., Miura, M., Moriyama, S., Nakahata, M., Obayashi, Y., Ogawa, H., Sekiya, H., Shiozawa, M., Suzuki, Y., Yasuo Takeuchi, Ueshima, K., Watanabe, H., Yamada, S., Higuchi, I., Ishihara, C., Ishitsuka, M., Kajita, T., Kaneyuki, K., Mitsuka, G., Nakayama, S., Nishino, H., Okumura, K., Saji, C., Takenaga, Y., Clark, S., Desai, S., Dufour, F., Kearns, E., Likhoded, S., Litos, M., Raaf, Jl, Stone, Jl, Sulak, Lr, Wang, W., Goldhaber, M., Casper, D., Cravens, Jp, Dunmore, J., Kropp, Wr, Liu, Dw, Mine, S., Regis, C., Smy, Mb, Sobel, Hw, Ganezer, Ks, Hill, J., Keig, We, Jang, Js, Kim, Jy, Lim, It, Scholberg, K., Tanimoto, N., Walter, Cw, Wendell, R., Ellsworth, Rw, Tasaka, S., Guillian, G., Learned, Jg, Matsuno, S., Messier, Md, Hayato, Y., Ichikawa, Ak, Ishida, T., Ishii, T., Iwashita, T., Kobayashi, T., Nakadaira, T., Nakamura, K., Nitta, K., Oyama, Y., Totsuka, Y., Suzuki, At, Hasegawa, M., Hiraide, K., Maesaka, H., Nakaya, T., Nishikawa, K., Sasaki, T., Yamamoto, S., Yokoyama, M., Haines, Tj, Dazeley, S., Hatakeyama, S., Svoboda, R., Sullivan, Gw, Turcan, D., Habig, A., Sato, T., Itow, Y., Koike, T., Tanaka, T., Jung, Ck, Kato, T., Kobayashi, K., Malek, M., Mcgrew, C., Sarrat, A., Terri, R., Yanagisawa, C., Tamura, N., Idehara, Y., Sakuda, M., Sugihara, M., Kuno, Y., Yoshida, M., Kim, Sb, Yang, Bs, Yoo, J., Ishizuka, T., Okazawa, H., Choi, Y., Seo, Hk, Gando, Y., Hasegawa, T., Inoue, K., Furuse, Y., Ishii, H., Nishijima, K., Ishino, H., Watanabe, Y., Koshiba, M., Chen, S., Deng, Z., Liu, Y., Kielczewska, D., Zalipska, J., Berns, H., Gran, R., Shiraishi, Kk, Stachyra, A., Thrane, E., Washburn, K., and Wilkes, Rj

17. Current status of solar neutrinos at super-kamiokande

Author

Cravens, P., Hosaka, J., Ishihara, K., Kameda, J., Koshio, Y., Minamino, A., Mitsuda, G., Miura, M., Moriyama, S., Nakahata, M., Namba, T., Obayashi, Y., Shiozawa, M., Suzuki, Y., Takeda, A., Takeuchi, Y., Yamada, S., Higuchi, I., Ishitsuka, M., Kajita, T., Kaneyuki, K., Mitsuka, G., Nakayama, S., Nishino, H., Okada, A., Okumura, K., Saji, C., Takenaga, Y., Clark, S., Desai, S., Kearns, E., Likhoded, S., Stone, J. L., Sulak, L. R., Wang, W., Goldhaber, M., Casper, D., Cravens, J. P., Kropp, W. R., Liu, D. W., Mine, S., Regis, C., Smy, M. B., Sobel, H. W., Sterner, C. W., Vagins, M. R., Ganezer, K. S., Hill, J. E., Keig, W. E., Jang, J. S., Kim, J. Y., Lim, I. T., Scholberg, K., Walter, C. W., Wendell, R., Ellsworth, R. W., Tasaka, S., Guillian, E., Kibayashi, A., Learned, J. G., Matsuno, S., Messier, M. D., Hayato, Y., Ichikawa, A. K., Ishida, T., Ishii, T., Iwashita, T., Kobayasln, T., Nakadaira, T., Nakamura, K., Nitta, K., Oyama, Y., Totsuka, Y., Suzuki, A. T., Hasegawa, M., Kato, I., Maesaka, H., Nakaya, T., Nishikawa, K., Sasaki, T., Sato, H., Yamamoto, S., Yokoyama, M., Haines, T. J., Dazeley, S., Hatakeyama, S., Svoboda, R., Blaufuss, E., Goodman, J. A., Sullivan, G. W., Turcan, D., Cooley, J., Habig, A., Fukuda, Y., Sato, T., Itow, Y., Jung, C. K., Kato, T., Kobayashi, K., Malek, M., Mauger, C., Mcgrew, C., Sarrat, A., Yanagisawa, C., Tamura, N., Sakuda, M., Kuno, Y., Yoshida, M., Kim, S. B., Yoo, J., Ishizuka, T., Okazawa, H., Choi, Y., Seo, H. K., Gando, Y., Hasegawa, T., Inoue, K., Shirai, J., Suzuki, A., Nishijima, K., Ishino, H., Watanabe, Y., Koshiba, M., Kielezewska, D., Joanna Zalipska, Berns, H. G., Gran, R., Shiraishi, K. K., Stachyra, A., Washburn, K., and Wilkes, R. J.

18. Search for v̄e from the Sun at Super-Kamiokande-I

Author

Gando, Y., Fukuda, S., Fukuda, Y., Ishitsuka, M., Itow, Y., Kajita, T., Kameda, J., Kaneyuki, K., Kobayashi, K., Koshio, Y., Miura, M., Moriyama, S., Nakahata, M., Nakayama, S., Namba, T., Obayashi, Y., Okada, A., Ooyabu, T., Saji, C., Sakurai, N., Shiozawa, M., Suzuki, Y., Takeuchi, H., Takeuchi, Y., Totsuka, Y., Yamada, S., Desai, S., Earl, M., Kearns, E., Messier, M. D., Stone, J. L., Sulak, L. R., Walter, C. W., Goldhaber, M., Barszczak, T., Casper, D., Gajewski, W., Kropp, W. R., Mine, S., Liu, D. W., Smy, M. B., Sobel, H. W., Vagins, M. R., Gago, A., Ganezer, K. S., Hill, J., Keig, W. E., Ellsworth, R. W., Tasaka, S., Kibayashi, A., Learned, J. G., Matsuno, S., Takemori, D., Yoshinari Hayato, Ichikawa, A. K., Ishii, T., Kobayashi, T., Maruyama, T., Nakamura, K., Oyama, Y., Sakuda, M., Yoshida, M., Kohama, M., Iwashita, T., Suzuki, A. T., Inagaki, T., Kato, I., Nakaya, T., Nishikawa, K., Haines, T. J., Dazeley, S., Hatakeyama, S., Svoboda, R., Blaufuss, E., Chen, M. L., Goodman, J. A., Guillian, G., Sullivan, G. W., Turcan, D., Scholberg, K., Habig, A., Ackermann, M., Jung, C. K., Martens, K., Malek, M., Mauger, C., Mcgrew, C., Sharkey, E., Viren, B., Yanagisawa, C., Toshito, T., Mitsuda, C., Miyano, K., Shibata, T., Kajiyama, Y., Nagashima, Y., Nitta, K., Takita, M., Kim, H. I., Kim, S. B., Yoo, J., Okazawa, H., Ishizuka, T., Etoh, M., Hasegawa, T., Inoue, K., Ishihara, K., Shirai, J., Suzuki, A., Koshiba, M., Hatakeyama, Y., Ichikawa, Y., Koike, M., Nishijima, K., Ishino, H., Morii, M., Nishimura, R., Watanabe, Y., Kielczewska, D., Berns, H. G., Boyd, S. C., Stachyra, A. L., and Wilkes, R. J.

19. A Search for Charged Excitation of Dark Matter with the KamLAND-Zen Detector

Author

Abe, S., Asami, 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., Kinoshita, T., Koga, M., Maemura, N., Mitsui, T., Miyake, H., Nakamura, K., Nakamura, R., Ono, A., Ota, N., Otsuka, S., Ozaki, H., Sakai, T., Sambonsugi, H., Shimizu, I., Shirahata, Y., Shirai, J., Shiraishi, K., Suzuki, A., Suzuki, Y., Takeuchi, A., Tamae, K., Ueshima, K., Wada, Y., Watanabe, H., Yoshida, Y., Obara, S., Chernyak, D., Kozlov, A., Yoshida, S., Umehara, S., Takemoto, Y., Fushimi, K., Hirata, S., Ichikawa, A., Nakamura, K. Z., Yoshida, M., Berger, B. E., Fujikawa, B. K., Grant, C., Aobo Li, Learned, J. G., Maricic, J., Axani, S., Winslow, L. A., Fu, Z., Efremenko, Y., Karwowski, H. J., Markoff, D. M., Tornow, W., O Donnell, T., Oro, S., Detwiler, J. A., Enomoto, S., and Decowski, M. P.

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

There are many theories where a dark matter particle is part of a multiplet with an electrically charged state. If WIMP dark matter ($\chi^{0}$) is accompanied by a charged excited state ($\chi^{-}$) separated by a small mass difference, it can form a stable bound state with a nucleus. In supersymmetric models, the $\chi^{0}$ and the $\chi^{-}$ could be the neutralino and a charged slepton, such as the neutralino-stau degenerate model. The formation binding process is expected to result in an energy deposition of {\it O}(1--10 MeV), making it suitable for detection in large liquid scintillator detectors. We describe new constraints on the bound state formation with a xenon nucleus using the KamLAND-Zen 400 Phase-II dataset. In order to enlarge the searchable parameter space, all xenon isotopes in the detector were used. For a benchmark parameter set of $m_{\chi^{0}} = 100$ GeV and $\Delta m = 10$ MeV, this study sets the most stringent upper limits on the recombination cross section $\langle\sigma v\rangle$ and the decay-width of $\chi^{-}$ of $2.0 \times 10^{-31}$ ${\rm cm^3/s}$ and $1.1 \times 10^{-18}$ GeV, respectively (90\% confidence level).

20. N-16 as a calibration source for Super-Kamiokande

Author

Blaufuss, E., Guillian, G., Fukuda, Y., Fukuda, S., Ishitsuka, M., Itow, Y., Kajita, T., Kameda, J., Kaneyuki, K., Kobayashi, K., Kobayashi, Y., Koshio, Y., Miura, M., Moriyama, S., Nakahata, M., Nakayama, S., Obayashi, Y., Okada, A., Okumura, K., Sakurai, N., Shiozawa, M., Suzuki, Y., Takeuchi, B., Yasuo Takeuchi, Toshito, T., Totsuka, Y., Yamada, S., Earl, M., Habig, A., Kearns, E., Messier, Md, Scholberg, K., Stone, Jl, Sulak, Lr, Walter, Cw, Goldhaber, M., Barszczak, T., Casper, D., Gajewski, W., Kropp, Wr, Mine, S., Price, Lr, Smy, M., Sobel, Hw, Vagins, MR, Ganezer, Ks, Keig, We, Ellsworth, Rw, Tasaka, S., Kibayashi, A., Learned, Jg, Matsuno, S., Takemori, D., Hayato, Y., Ishii, T., Kobayashi, T., Nakamura, K., Oyama, Y., Sakai, A., Sakuda, M., Sasaki, O., Echigo, S., Kohama, M., Suzuki, At, Inagaki, T., Nishikawa, K., Haines, Tj, Kim, Bk, Sanford, R., Svoboda, R., Chen, Ml, Goodman, Ja, Sullivan, Gw, Hill, J., Jung, Ck, Martens, K., Malek, M., Mauger, C., Mcgrew, C., Sharkey, E., Viren, B., Yanagisawa, C., Kirisawa, M., Inaba, S., Mitsuda, C., Miyano, K., Okazawa, H., Saji, C., Takahashi, M., Takahata, M., Nagashima, Y., Nitta, K., Takita, M., Yoshida, M., Kim, Sb, Etoh, M., Gando, Y., Hasegawa, T., Inoue, K., Ishihara, K., Maruyama, T., Shirai, J., Suzuki, A., Koshiba, M., Hatakeyama, Y., Ichikawa, Y., Koike, M., Nishijima, K., Fujiyasu, H., Ishino, H., Morii, M., Watanabe, Y., Golebiewska, U., Kielczewska, D., Boyd, Sc, Stachyra, Al, Wilkes, Rj, Young, Kk, and Super-Kamiokande Collaboration

21. Search for v̄e from the Sun at Super-Kamiokande-I

Author

Gando, Y., Fukuda, S., Fukuda, Y., Ishitsuka, M., Itow, Y., Kajita, T., Kameda, J., Kaneyuki, K., Kobayashi, K., Koshio, Y., Miura, M., Moriyama, S., Nakahata, M., Nakayama, S., Namba, T., Obayashi, Y., Okada, A., Ooyabu, T., Saji, C., Sakurai, N., Shiozawa, M., Suzuki, Y., Takeuchi, H., Takeuchi, Y., Totsuka, Y., Yamada, S., Desai, S., Earl, M., Kearns, E., Messier, M. D., Stone, J. L., Sulak, L. R., Walter, C. W., Goldhaber, M., Barszczak, T., Casper, D., Gajewski, W., Kropp, W. R., Mine, S., Liu, D. W., Smy, M. B., Sobel, H. W., Vagins, M. R., Gago, A., Ganezer, K. S., Hill, J., Keig, W. E., Ellsworth, R. W., Tasaka, S., Kibayashi, A., Learned, J. G., Matsuno, S., Takemori, D., Hayato, Y., Ichikawa, A. K., Ishii, T., Kobayashi, T., Maruyama, T., Nakamura, K., Oyama, Y., Sakuda, M., Yoshida, M., Kohama, M., Iwashita, T., Suzuki, A. T., Inagaki, T., Kato, I., Nakaya, T., Nishikawa, K., Haines, T. J., Dazeley, S., Hatakeyama, S., Svoboda, R., Blaufuss, E., Chen, M. L., Goodman, J. A., Guillian, G., Sullivan, G. W., Turcan, D., Scholberg, K., Alec Habig, Ackermann, M., Jung, C. K., Martens, K., Malek, M., Mauger, C., Mcgrew, C., Sharkey, E., Viren, B., Yanagisawa, C., Toshito, T., Mitsuda, C., Miyano, K., Shibata, T., Kajiyama, Y., Nagashima, Y., Nitta, K., Takita, M., Kim, H. I., Kim, S. B., Yoo, J., Okazawa, H., Ishizuka, T., Etoh, M., Hasegawa, T., Inoue, K., Ishihara, K., Shirai, J., Suzuki, A., Koshiba, M., Hatakeyama, Y., Ichikawa, Y., Koike, M., Nishijima, K., Ishino, H., Morii, M., Nishimura, R., Watanabe, Y., Kielczewska, D., Berns, H. G., Boyd, S. C., Stachyra, A. L., and Wilkes, R. J.

22. Search for diffuse astrophysical neutrino flux using ultra-high-energy upward-going muons in Super-Kamiokande I

Author

Swanson, Mec, Abe, K., Hosaka, J., Iida, T., Ishihara, K., Kameda, J., Koshio, Y., Minamino, A., Mitsuda, C., Miura, M., Moriyama, S., Nakahata, M., Obayashi, Y., Ogawa, H., Shiozawa, M., Suzuki, Y., Takeda, A., Takeuchi, Y., Ueshima, K., Higuchi, I., Ishihara, C., Ishitsuka, M., Kajita, T., Kaneyuki, K., Mitsuka, G., Nakayama, S., Nishino, H., Okada, A., Okumura, K., Saji, C., Takenaga, Y., Clark, S., Desai, S., Dufour, F., Kearns, E., Likhoded, S., Litos, M., Raaf, Jl, Stone, Jl, Sulak, Lr, Wang, W., Goldhaber, M., Casper, D., Cravens, Jp, Dunmore, J., Kropp, Wr, Liu, Dw, Mine, S., Regis, C., Smy, Mb, Sobel, Hw, Vagins, MR, Ganezer, Ks, Hill, Je, Keig, We, Jang, Js, Kim, Jy, Lim, It, Scholberg, K., Tanimoto, N., Walter, Cw, Wendell, R., Ellsworth, Rw, Tasaka, S., Guillian, G., Learned, Jg, Matsuno, S., Messier, Md, Hayato, Y., Ichikawa, Ak, Ishida, T., Ishii, T., Iwashita, T., Kobayashi, T., Nakadaira, T., Nakamura, K., Nitta, K., Oyama, Y., Totsuka, Y., Suzuki, At, Hasegawa, M., Hiraide, K., Kato, I., Maesaka, H., Nakaya, T., Nishikawa, K., Sasaki, T., Sato, H., Yamamoto, S., Masashi Yokoyama, Haines, Tj, Dazeley, S., Hatakeyama, S., Svoboda, R., Sullivan, Gw, Turcan, D., Cooley, J., Mahn, Kbm, Habig, A., Fukuda, Y., Sato, T., Itow, Y., Koike, T., Jung, Ck, Kato, T., Kobayashi, K., Malek, M., Mcgrew, C., Sarrat, A., Terri, R., Yanagisawa, C., Tamura, N., Sakuda, M., Sugihara, M., Kuno, Y., Yoshida, M., Kim, Sb, Yang, Bs, Yoo, J., Ishizuka, T., Okazawa, H., Choi, Y., Seo, Hk, Gando, Y., Hasegawa, T., Inoue, K., Ishii, H., Nishijima, K., Ishino, H., Watanabe, Y., Koshiba, M., Kielczewska, D., Zalipska, J., Berns, Hg, Gran, R., Shiraishi, Kk, Stachyra, A., Thrane, E., Washburn, K., and Wilkes, Rj

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