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1. Solar neutrino measurements using the full data period of Super-Kamiokande-IV

Author

Collaboration, Super-Kamiokande, Abe, K., Bronner, C., Hayato, Y., Hiraide, K., Hosokawa, K., Ieki, K., Ikeda, M., Imaizumi, S., Iyogi, K., Kameda, J., Kanemura, Y., Kaneshima, R., Kashiwagi, Y., Kataoka, Y., Kato, Y., Kishimoto, Y., Miki, S., Mine, S., Miura, M., Mochizuki, T., Moriyama, S., Nagao, Y., Nakahata, M., Nakano, Y., Nakayama, S., Noguchi, Y., Okada, T., Okamoto, K., Orii, A., Sato, K., Sekiya, H., Shiba, H., Shimizu, K., Shiozawa, M., Sonoda, Y., Suzuki, Y., Takeda, A., Takemoto, Y., Takenaka, A., Tanaka, H., Watanabe, S., Yano, T., Han, S., Kajita, T., Okumura, K., Tashiro, T., Tomiya, T., Wang, R., Wang, X., Yoshida, S., Bravo-Berguno, D., Fernandez, P., Labarga, L., Ospina, N., Zaldivar, B., Pointon, B. W., Blaszczyk, F. d. M., Kachulis, C., Kearns, E., Raaf, J. L., Stone, J. L., Wan, L., Wester, T., Bian, J., Griskevich, N. J., Kropp, W. R., Locke, S., Smy, M. B., Sobel, H. W., Takhistov, V., Weatherly, P., Yankelevich, A., Ganezer, K. S., Hill, J., Jang, M. C., Kim, J. Y., Lee, S., Lim, I. T., Moon, D. H., Park, R. G., Bodur, B., Scholberg, K., Walter, C. W., Beauchene, A., Bernard, L., Coffani, A., Drapier, O., Hedri, S. El, Giampaolo, A., Imber, J., Mueller, Th. A., Paganini, P., Rogly, R., Quilain, B., Santos, A., Nakamura, T., Jang, J. S., Machado, L. N., Learned, J. G., Matsuno, S., Iovine, N., Choi, K., Cao, S., Anthony, L. H. V., Litchfield, R. P., Prouse, N., Marin, D., Scott, M., Sztuc, A. A., Uchida, Y., Berardi, V., Catanesi, M. G., Intonti, R. A., Radicioni, E., Calabria, N. F., De Rosa, G., Langella, A., Collazuol, G., Iacob, F., Lamoureux, M., Mattiazzi, M., Ludovici, L., Gonin, M., Perisse, L., Pronost, G., Fujisawa, C., Maekawa, Y., Nishimura, Y., Okazaki, R., Friend, M., Hasegawa, T., Ishida, T., Jakkapu, M., Kobayashi, T., Matsubara, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Boschi, T., Bhuiyan, N., Burton, G. T., Gao, J., Goldsack, A., Katori, T., Di Lodovico, F., Migenda, J., Sedgwick, S. Molina, Ramsden, R. M., Taani, M., Xie, Z., Zsoldos, S., Abe, KE., Hasegawa, M., Isobe, Y., Kotsar, Y., Miyabe, H., Ozaki, H., Shiozawa, T., Sugimoto, T., Suzuki, A. T., Takagi, Y., Takeuchi, Y., Yamamoto, S., Zhong, H., Ashida, Y., Feng, J., Feng, L., Hayashino, T., Hirota, S., Hu, J. R., Hu, Z., Jiang, M., Kawaue, M., Kikawa, T., Mori, M., Nakamura, KE., Nakaya, T., Wendell, R. A., Yasutome, K., Jenkins, S. J., McCauley, N., Mehta, P., Pritchard, A., Tarrant, A., Wilking, M. J., Fukuda, Y., Itow, Y., Menjo, H., Murase, M., Ninomiya, K., Niwa, T., Tsukada, M., Yoshioka, Y., Frankiewicz, K., Lagoda, J., Mandal, M., Mijakowski, P., Prabhu, Y. S., Zalipska, J., Jiang, J., Jia, M., Jung, C. K., Palomino, J. L., Santucci, G., Shi, W., Vilela, C., Yanagisawa, C., Fukuda, D., Hagiwara, K., Harada, M., Hino, Y., Horai, T., Ishino, H., Ito, S., Kitagawa, H., Koshio, Y., Ma, W., Nakanishi, F., Piplani, N., Sakai, S., Sakuda, M., Tada, T., Tano, T., Xu, C., Yamaguchi, R., Ishizuka, T., Kuno, Y., Barr, G., Barrow, D., Cook, L., Samani, S., Simpson, C., Wark, D., Holin, A. M., Nova, F., Jung, S., Yang, B., Yang, J. Y., Yoo, J., Fannon, J. E. P., Kneale, L., Malek, M., McElwee, J. M., Stone, O., Thiesse, M. D., Thompson, L. F., Wilson, S. T., Okazawa, H., Lakshmi, S. M., Choi, Y., Kim, S. B., Kwon, E., Seo, J. W., Yu, I., Ichikawa, A. K., Tairahune, S., Nishijima, K., Eguchi, A., Iwamoto, K., Nakagiri, K., Nakajima, Y., Ogawa, N., Shima, S., Watanabe, E., Yokoyama, M., Calland, R. G., Fujita, S., Jesus-Valls, C., Junjie, X., Ming, T. K., de Perio, P., Martens, K., Murdoch, M., Vagins, M. R., Izumiyama, S., Kuze, M., Matsumoto, R., Okajima, Y., Tanaka, M., Yoshida, T., Inomoto, M., Ishitsuka, M., Ito, H., Kinoshita, T., Ohta, K., Ommura, Y., Shinoki, M., Shigeta, N., Suganuma, T., Yamaguchi, K., Martin, J. F., Nantais, C. M., Tanaka, H. A., Towstego, T., Gaur, R., Gousy-Leblanc, V., Hartz, M., Konaka, A., Li, X., Chen, S., Xu, B. D., Zhang, B., Berkman, S., Posiadala-Zezula, M., Boyd, S. B., Edwards, R., Hadley, D., Nicholson, M., O'Flaherty, M., Richards, B., Ali, A., Jamieson, B., Walker, J., Amanai, S., Marti, Ll., Minamino, A., Pintaudi, G., Sano, S., Sasaki, R., Suzuki, S., and Wada, K.

Subjects
High Energy Physics - Experiment
Abstract

An analysis of solar neutrino data from the fourth phase of Super-Kamiokande~(SK-IV) from October 2008 to May 2018 is performed and the results are presented. The observation time of the data set of SK-IV corresponds to $2970$~days and the total live time for all four phases is $5805$~days. For more precise solar neutrino measurements, several improvements are applied in this analysis: lowering the data acquisition threshold in May 2015, further reduction of the spallation background using neutron clustering events, precise energy reconstruction considering the time variation of the PMT gain. The observed number of solar neutrino events in $3.49$--$19.49$ MeV electron kinetic energy region during SK-IV is $65,443^{+390}_{-388}\,(\mathrm{stat.})\pm 925\,(\mathrm{syst.})$ events. Corresponding $\mathrm{^{8}B}$ solar neutrino flux is $(2.314 \pm 0.014\, \rm{(stat.)} \pm 0.040 \, \rm{(syst.)}) \times 10^{6}~\mathrm{cm^{-2}\,s^{-1}}$, assuming a pure electron-neutrino flavor component without neutrino oscillations. The flux combined with all SK phases up to SK-IV is $(2.336 \pm 0.011\, \rm{(stat.)} \pm 0.043 \, \rm{(syst.)}) \times 10^{6}~\mathrm{cm^{-2}\,s^{-1}}$. Based on the neutrino oscillation analysis from all solar experiments, including the SK $5805$~days data set, the best-fit neutrino oscillation parameters are $\rm{sin^{2} \theta_{12,\,solar}} = 0.306 \pm 0.013 $ and $\Delta m^{2}_{21,\,\mathrm{solar}} = (6.10^{+ 0.95}_{-0.81}) \times 10^{-5}~\rm{eV}^{2}$, with a deviation of about 1.5$\sigma$ from the $\Delta m^{2}_{21}$ parameter obtained by KamLAND. The best-fit neutrino oscillation parameters obtained from all solar experiments and KamLAND are $\sin^{2} \theta_{12,\,\mathrm{global}} = 0.307 \pm 0.012 $ and $\Delta m^{2}_{21,\,\mathrm{global}} = (7.50^{+ 0.19}_{-0.18}) \times 10^{-5}~\rm{eV}^{2}$., Comment: 47 pages, 61 figures

Published
2023
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2. Multidomain Intervention Trial for Preventing Cognitive Decline among Older Adults with Type 2 Diabetes: J-MIND-Diabetes

Author

Sugimoto, T., Araki, A., Fujita, H., Fujita, K., Honda, K., Inagaki, N., Ishida, T., Kato, J., Kishi, M., Kishino, Y., Kobayashi, K., Kouyama, K., Kuroda, Y., Kuwahata, S., Matsumoto, N., Murakami, T., Noma, H., Ogino, J., Ogura, M., Ohishi, M., Shimada, H., Sugimoto, K., Takenaka, T., Tamura, Y., Tokuda, H., Uchida, K., Umegaki, H., and Sakurai, Takashi

Published
2024
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3. Diamond-shaped quantum circuit for real-time quantum dynamics in one dimension

Author

Miyakoshi, S., Sugimoto, T., Shirakawa, T., Yunoki, S., and Ueda, H.

Subjects
Quantum Physics, Condensed Matter - Statistical Mechanics
Abstract

In recent years, quantum computing has evolved as an exciting frontier, with the development of numerous algorithms dedicated to constructing quantum circuits that adeptly represent quantum many-body states. However, this domain remains in its early stages and requires further refinement to understand better the effective construction of highly-entangled quantum states within quantum circuits. Here, we demonstrate that quantum many-body states can be universally represented using a quantum circuit comprising multi-qubit gates. Furthermore, we evaluate the efficiency of a quantum circuit constructed with two-qubit gates in quench dynamics for the transverse-field Ising model. In this specific model, despite the initial state being classical without entanglement, it undergoes long-time evolution, eventually leading to a highly-entangled quantum state. Our results reveal that a diamond-shaped quantum circuit, designed to approximate the multi-qubit gate-based quantum circuit, remarkably excels in accurately representing the long-time dynamics of the system. Moreover, the diamond-shaped circuit follows the volume law behavior in entanglement entropy, offering a significant advantage over alternative quantum circuit constructions employing two-qubit gates., Comment: 15 pages, 13 figures

Published
2023

4. Neutron Tagging following Atmospheric Neutrino Events in a Water Cherenkov Detector

Author

Abe, K., Haga, Y., Hayato, Y., Hiraide, K., Ieki, K., Ikeda, M., Imaizumi, S., Iyogi, K., Kameda, J., Kanemura, Y., Kataoka, Y., Kato, Y., Kishimoto, Y., Miki, S., Mine, S., Miura, M., Mochizuki, T., Moriyama, S., Nagao, Y., Nakahata, M., Nakajima, T., Nakano, Y., Nakayama, S., Okada, T., Okamoto, K., Orii, A., Sato, K., Sekiya, H., Shiozawa, M., Sonoda, Y., Suzuki, Y., Takeda, A., Takemoto, Y., Takenaka, A., Tanaka, H., Tasaka, S., Tomura, T., Ueno, K., Watanabe, S., Yano, T., Yokozawa, T., Han, S., Irvine, T., Kajita, T., Kametani, I., Kaneyuki, K., Lee, K. P., McLachlan, T., Okumura, K., Richard, E., Tashiro, T., Wang, R., Xia, J., Megias, G. D., Bravo-Berguño, D., Labarga, L., Zaldivar, B., Goldhaber, M., Blaszczyk, F. d. M., Gustafson, J., Kachulis, C., Kearns, E., Raaf, J. L., Stone, J. L., Sulak, L. R., Sussman, S., Wan, L., Wester, T., Pointon, B. W., Bian, J., Carminati, G., Elnimr, M., Griskevich, N. J., Kropp, W. R., Locke, S., Renshaw, A., Smy, M. B., Sobel, H. W., Takhistov, V., Weatherly, P., Ganezer, K. S., Hartfiel, B. L., Hill, J., Keig, W. E., Hong, N., Kim, J. Y., Lim, I. T., Park, R. G., Akiri, T., Bodur, B., Himmel, A., Li, Z., O'Sullivan, E., Scholberg, K., Walter, C. W., Wongjirad, T., Bernard, L., Coffani, A., Drapier, O., Hedri, S. El, Giampaolo, A., Imber, J., Mueller, Th. A., Paganini, P., Quilain, B., Ishizuka, T., Nakamura, T., Jang, J. S., Choi, K., Learned, J. G., Matsuno, S., Smith, S. N., Amey, J., Anthony, L. H. V., Litchfield, R. P., Ma, W. Y., Marin, D., Sztuc, A. A., Uchida, Y., Wascko, M. O., Berardi, V., Catanesi, M. G., Intonti, R. A., Radicioni, E., Calabria, N. F., De Rosa, G., Machado, L. N., Collazuol, G., Iacob, F., Lamoureux, M., Ospina, N., Ludovici, L., Gonin, M., Pronost, G., Maekawa, Y., Nishimura, Y., Cao, S., Friend, M., Hasegawa, T., Ishida, T., Ishii, T., Jakkapu, M., Kobayashi, T., Matsubara, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Boschi, T., Di Lodovico, F., Migenda, J., Sedgwick, S. Molina, Taani, M., Zsoldos, S., Abe, KE., Hasegawa, M., Isobe, Y., Kotsar, Y., Miyabe, H., Ozaki, H., Shiozawa, T., Sugimoto, T., Suzuki, A. T., Takeuchi, Y., Yamamoto, S., Ali, A., Ashida, Y., Bronner, C., Feng, J., Hayashino, T., Hiraki, T., Hirota, S., Huang, K., Jiang, M., Kikawa, T., Mori, M., Murakami, A., Nakamura, KE., Nakaya, T., Patel, N. D., Suzuki, K., Takahashi, S., Tateishi, K., Wendell, R. A., Yasutome, K., Fernandez, P., McCauley, N., Mehta, P., Pritchard, A., Tsui, K. M., Fukuda, Y., Itow, Y., Menjo, H., Mitsuka, G., Murase, M., Muto, F., Niwa, T., Tsukada, T. Suzuki M., Frankiewicz, K., Mijakowski, P., Hignight, J., Jiang, J., Jung, C. K., Li, X., Palomino, J. L., Santucci, G., Vilela, C., Wilking, M. J., Yanagisawa, C., Fukuda, D., Hagiwara, K., Harada, M., Horai, T., Ishino, H., Ito, S., Kayano, T., Kibayashi, A., Kitagawa, H., Koshio, Y., Ma, W., Mori, T., Nagata, H., Piplani, N., Sakai, S., Sakuda, M., Takahira, Y., Xu, C., Yamaguchi, R., Kuno, Y., Barr, G., Barrow, D., Cook, L., Goldsack, A., Samani, S., Simpson, C., Wark, D., Nova, F., Tacik, R., Yang, J. Y., Cole, A., Jenkins, S. J., Malek, M., McElwee, J. M., Stone, O., Thiesse, M. D., Thompson, L. F., Okazawa, H., Choi, Y., Kim, S. B., Yu, I., Ichikawa, A. K., Ito, K., Nishijima, K., Calland, R. G., de Perio, P., Martens, K., Murdoch, M., Vagins, M. R., Koshiba, M., Totsuka, Y., Iwamoto, K., Nakajima, Y., Ogawa, N., Suda, Y., Yokoyama, M., Hamabe, D., Izumiyama, S., Kuze, M., Okajima, Y., Tanaka, M., Yoshida, T., Inomoto, M., Ishitsuka, M., Ito, H., Matsumoto, R., Ohta, K., Shinoki, M., Martin, J. F., Nantais, C. M., Tanaka, H. A., Towstego, T., Akutsu, R., Hartz, M., Konaka, A., Prouse, N. W., Chen, S., Xu, B. D., Zhang, Y., Berkman, S., Tobayama, S., Connolly, K., Wilkes, R. J., Posiadala-Zezula, M., Hadley, D., Richards, B., Jamieson, B., Walker, J., Marti, Ll., Minamino, A., Pintaudi, G., Sano, S., and Sasaki, R.

Subjects
High Energy Physics - Experiment, Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
Abstract

We present the development of neutron-tagging techniques in Super-Kamiokande IV using a neural network analysis. The detection efficiency of neutron capture on hydrogen is estimated to be 26%, with a mis-tag rate of 0.016 per neutrino event. The uncertainty of the tagging efficiency is estimated to be 9.0%. Measurement of the tagging efficiency with data from an Americium-Beryllium calibration agrees with this value within 10%. The tagging procedure was performed on 3,244.4 days of SK-IV atmospheric neutrino data, identifying 18,091 neutrons in 26,473 neutrino events. The fitted neutron capture lifetime was measured as 218 \pm 9 \mu s.

Published
2022
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6. Testing Non-Standard Interactions Between Solar Neutrinos and Quarks with Super-Kamiokande

Author

Collaboration, Super-Kamiokande, Weatherly, P., Abe, K., Bronner, C., Hayato, Y., Hiraide, K., Ikeda, M., Iyogi, K., Kameda, J., Kanemura, Y., Kataoka, Y., Kato, Y., Kishimoto, Y., Miki, S., Miura, M., Moriyama, S., Mochizuki, T., Nakahata, M., Nakano, Y., Nakayama, S., Okada, T., Okamoto, K., Orii, A., Pronost, G., Sato, K., Sekiya, H., Shiozawa, M., Sonoda, Y., Suzuki, Y., Takeda, A., Takemoto, Y., Takenaka, A., Tanaka, H., Tasaka, S., Wang, X., Watanabe, S., Yano, T., Han, S., Kajita, T., Kaneyuki, K., Okumura, K., Tashiro, T., Wang, R., Xia, J., Megias, G. D., Labarga, L., Zaldivar, B., Pointon, B. W., Blaszczyk, F. d. M., Kachulis, C., Kearns, E., Raaf, J. L., Stone, J. L., Sulak, L. R., Sussman, S., Wan, L., Wester, T., Berkman, S., Tobayama, S., Bian, J., Elnimr, M., Griskevich, N. J., Kropp, W. R., Locke, S., Mine, S., Smy, M. B., Sobel, H. W., Takhistov, V., Yankelevich, A., Ganezer, K. S., Hill, J., Kim, J. Y., Lim, I. T., Park, R. G., Bodur, B., Li, Z., Scholberg, K., Walter, C. W., Bernard, L., Coffani, A., Drapier, O., Giampaolo, A., Hedri, S. El, Imber, J., Mueller, Th. A., Paganini, P., Quilain, B., Santos, A. D., Ishizuka, T., Nakamura, T., Jang, J. S., Learned, J. G., Matsuno, S., Cao, S., Amey, J., Anthony, L. H. V., Litchfield, R. P., Ma, W. Y., Martin, D., Scott, M., Sztuc, A. A., Uchida, Y., Wascko, M. O., Berardi, V., Catanesi, M. G., Intonti, R. A., Radicioni, E., Calabria, N. F., Machado, L. N., De Rosa, G., Collazuol, G., Iacob, F., Lamoureux, M., Mattiazzi, M., Ospina, N., Ludovici, L., Gonin, M., Maekawa, Y., Nishimura, Y., Friend, M., Hasegawa, T., Ishida, T., Jakkapu, M., Kobayashi, T., Matsubara, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Boschi, T., Di Lodovico, F., Gao, J., Katori, T., Migenda, J., Taani, M., Zsoldos, S., Abe, KE., Hasegawa, M., Isobe, Y., Kotsar, Y., Miyabe, H., Ozaki, H., Sugimoto, T., Suzuki, A. T., Takeuchi, Y., Yamamoto, S., Ashida, Y., Feng, J., Hayashino, T., Hirota, S., Jiang, M., Kikawa, T., Mori, M., Nakaya, T., Wendell, R. A., Yasutome, K., Fernandez, P., McCauley, N., Mehta, P., Pritchard, A., Tsui, K. M., Fukuda, Y., Itow, Y., Menjo, H., Murase, M., Frankiewicz, K., Lagoda, J., Lakshmi, S. M., Mandal, M., Mijakowski, P., Prabhu, Y. S., Zalipska, J., Jia, M., Jiang, J., Jung, C. K., Li, X., Palomino, J. L., Santucci, G., Vilela, C., Wilking, M. J., Yanagisawa, C., Fukuda, D., Hagiwara, K., Harada, M., Ishino, H., Ito, S., Kitagawa, H., Koshio, Y., Ma, W., Sakai, S., Sakuda, M., Takahira, Y., Xu, C., Kuno, Y., Barr, G., Barrow, D., Cook, L., Goldsack, A., Samani, S., Simpson, C., Wark, D., Sedgwick, S. Molina, Tacik, R., Nova, F., Yang, J. Y., Jenkins, S. J., Malek, M., McElwee, J. M., Stone, O., Thiesse, M. D., Thompson, L. F., Okazawa, H., Choi, Y., Kim, S. B., Seo, J. W., Yu, I., Ichikawa, A., Nakamura, K. D., Nishijima, K., Koshiba, M., Iwamoto, K., Nakagiri, K., Nakajima, Y., Suda, Y., Taniuchi, N., Yokoyama, M., Martens, K., Murdoch, M., Vagins, M. R., Hamabe, D., Izumiyama, S., Kuze, M., Okajima, Y., Yoshida, T., Inomoto, M., Ishitsuka, M., Ito, H., Kinoshita, T., Matsumoto, R., Shinoki, M., Suganuma, T., Yonenaga, M., Martin, J. F., Nantais, C. M., Tanaka, H. A., Towstego, T., Akutsu, R., de Perio, P., Gousy-Leblanc, V., Hartz, M., Konaka, A., Prouse, N. W., Chen, S., Xu, B. D., Zhang, B., Posiadala-Zezula, M., Hadley, D., Nicholson, M., O'Flaherty, M., Richards, B., Ali, A., Jamieson, B., Giorgio, P., Marti, Ll., Minamino, A., Pintaudi, G., Sano, S., Sasaki, R., and Wada, K.

Subjects
High Energy Physics - Experiment, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics
Abstract

Non-Standard Interactions (NSI) between neutrinos and matter affect the neutrino flavor oscillations. Due to the high matter density in the core of the Sun, solar neutrinos are suited to probe these interactions. Using the $277$ kton-yr exposure of Super-Kamiokande to $^{8}$B solar neutrinos, we search for the presence of NSI. Our data favors the presence of NSI with down quarks at 1.8$\sigma$, and with up quarks at 1.6$\sigma$, with the best fit NSI parameters being ($\epsilon_{11}^{d},\epsilon_{12}^{d}$) = (-3.3, -3.1) for $d$-quarks and ($\epsilon_{11}^{u},\epsilon_{12}^{u}$) = (-2.5, -3.1) for $u$-quarks. After combining with data from the Sudbury Neutrino Observatory and Borexino, the significance increases by 0.1$\sigma$., Comment: Author: Pierce Weatherly 25 pages. To be submitted to Physical Review D

Published
2022

8. Observation of nuclear-spin Seebeck effect

Author

Kikkawa, T., Reitz, D., Ito, H., Makiuchi, T., Sugimoto, T., Tsunekawa, K., Daimon, S., Oyanagi, K., Ramos, R., Takahashi, S., Shiomi, Y., Tserkovnyak, Y., and Saitoh, E.

Subjects
Condensed Matter - Materials Science, Condensed Matter - Strongly Correlated Electrons
Abstract

Thermoelectric effects have been applied to power generators and temperature sensors that convert waste heat into electricity. The effects, however, have been limited to electrons to occur, and inevitably disappear at low temperatures due to electronic entropy quenching. Here, we report thermoelectric generation caused by nuclear spins in a solid: nuclear-spin Seebeck effect. The sample is a magnetically ordered material MnCO$_{3}$ having a large nuclear spin ($I = 5/2$) of $^{55}$Mn nuclei and strong hyperfine coupling, with a Pt contact. In the system, we observe low-temperature thermoelectric signals down to 100 mK due to nuclear-spin excitation. Our theoretical calculation in which interfacial Korringa process is taken into consideration quantitatively reproduces the results. The nuclear thermoelectric effect demonstrated here offers a way for exploring thermoelectric science and technologies at ultralow temperatures., Comment: This is a post-peer-review, pre-copyedit version of an article published in Nature Communications. The final authenticated version is available online at: http://dx.doi.org/10.1038/s41467-021-24623-6

Published
2021
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9. A measurement of proton-carbon forward scattering in a proof-of-principle test of the EMPHATIC spectrometer

Author

Pavin, M., Aliaga-Soplin, L., Barbi, M., Bellantoni, L., Bhadra, S., Ferrazzi, B., Fields, L., Fiorentini, A., Fukuda, T., Gameil, K., Hakim, Y. Al, Hartz, M., Jamieson, B., Kiburg, M., Kolev, N., Kawai, H., Konaka, A., Lebrun, P., Lindner, T., Mizuno, T., Naganawa, N., Paley, J., Rivera, R., Santucci, G., Sato, O., Sekiguchi, T., Sikora, A., Slater, G., Suzuki, A., Sugimoto, T., Tabata, M., Uplegger, L., and Vladisavljevic, T.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

The next generation of long-baseline neutrino experiments will be capable of precision measurements of neutrino oscillation parameters, precision neutrino-nucleus scattering, and unprecedented sensitivity to physics beyond the Standard Model. Reduced uncertainties in neutrino fluxes are necessary to achieve high precision and sensitivity in these future precise neutrino measurements. New measurements of hadron-nucleus interaction cross sections are needed to reduce uncertainties of neutrino fluxes. We report measurements of the differential cross-section as a function of scattering angle for proton-carbon interactions with a single charged particle in the final state at beam momenta of 20, 30, and 120 GeV/c. These measurements are the result of a beam test for EMPHATIC, a hadron-scattering and hadron-production experiment. The total, elastic and inelastic cross-sections are also extracted from the data and compared to previous measurements. These results can be used in current and future long-baseline neutrino experiments, and demonstrate the feasibility of future measurements by an upgraded EMPHATIC spectrometer.

Published
2021
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10. Search for Tens of MeV Neutrinos associated with Gamma-Ray Bursts in Super-Kamiokande

Author

Collaboration, The Super-Kamiokande, Orii, A., Abe, K., Bronner, C., Hayato, Y., Ikeda, M., Imaizumi, S., Ito, H., Kameda, J., Kataoka, Y., Kato, Y., Kishimoto, Y., Miura, M., Moriyama, S., Mochizuki, T., Nagao, Y., Nakahata, M., Nakajima, Y., Nakayama, S., Okada, T., Okamoto, K., Pronost, G., Sekiya, H., Shiozawa, M., Sonoda, Y., Suzuki, Y., Takeda, A., Takemoto, Y., Takenaka, A., Tanaka, H., Yano, T., Han, S., Kajita, T., Okumura, K., Tashiro, T., Wang, R., Xia, J., Megias, G. D., Bravo-Berguno, D., Labarga, L., Marti, Ll., Zaldivar, B., Blaszczyk, F. d. M., Kearns, E., Raaf, J. L., Stone, J. L., Wan, L., Wester, T., Pointon, B. W., Bian, J., Griskevich, N. J., Kropp, W. R., Locke, S., Mine, S., Smy, M. B., Sobel, H. W., Takhistov, V., Weatherly, P., Ganezer, K. S., Hill, J., Kim, J. Y., Lim, I. T., Park, R. G., Bodur, B., Scholberg, K., Walter, C. W., Bernard, L., Coffani, A., Drapier, O., Hedri, S. El, Giampaolo, A., Gonin, M., Mueller, Th. A., Paganini, P., Quilain, B., Ishizuka, T., Nakamura, T., Jang, J. S., Learned, J. G., Matsuno, S., Anthony, L. H. V., Litchfield, R. P., Sztuc, A. A., Uchida, Y., Berardi, V., Catanesi, M. G., Radicioni, E., Calabria, N. F., Machado, L. N., De Rosa, G., Collazuol, G., Iacob, F., Lamoureux, M., Ospina, N., Ludovici, L., Nishimura, Y., Cao, S., Friend, M., Hasegawa, T., Ishida, T., Kobayashi, T., Jakkapu, M., Matsubara, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Boschi, T., Di Lodovico, F., Sedgwick, S. Molina, Taani, M., Zsoldos, S., Hasegawa, M., Isobe, Y., Miyabe, H., Nakano, Y., Shiozawa, T., Sugimoto, T., Suzuki, A. T., Takeuchi, Y., Yamamoto, S., Ali, A., Ashida, Y., Feng, J., Hirota, S., Jiang, M., Ichikawa, A. K., Kikawa, T., Mori, M., Nakamura, KE., Nakaya, T., Wendell, R. A., Yasutome, K., Fernandez, P., McCauley, N., Mehta, P., Pritchard, A., Tsui, K. M., Fukuda, Y., Itow, Y., Menjo, H., Niwa, T., Sato, K., Tsukada, M., Mijakowski, P., Frankiewicz, K., Jung, C. K., Vilela, C., Wilking, M. J., Yanagisawa, C., Fukuda, D., Harada, M., Hagiwara, K., Horai, T., Ishino, H., Ito, S., Koshio, Y., Ma, W., Piplani, N., Sakai, S., Sakuda, M., Takahira, Y., Xu, C., Kuno, Y., Barr, G., Barrow, D., Cook, L., Goldsack, A., Samani, S., Simpson, C., Wark, D., Nova, F., Yang, J. Y., Jenkins, S. J., Malek, M., McElwee, J. M., Stone, O., Thiesse, M. D., Thompson, L. F., Okazawa, H., Choi, Y., Kim, S. B., Yu, I., Nishijima, K., Koshiba, M., Iwamoto, K., Ogawa, N., Yokoyama, M., Martens, K., Vagins, M. R., Izumiyama, S., Kuze, M., Tanaka, M., Yoshida, T., Inomoto, M., Ishitsuka, M., Matsumoto, R., Ohta, K., Shinoki, M., Martin, J. F., Nantais, C. M., Tanaka, H. A., Towstego, T., Akutsu, R., Hartz, M., Konaka, A., de Perio, P., Prouse, N. W., Chen, S., Xu, B. D., Posiadala-Zezula, M., Richards, B., Jamieson, B., Walker, J., Minamino, A., Pintaudi, G., and Sasaki, R.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract

A search for neutrinos produced in coincidence with Gamma-Ray Bursts(GRB) was conducted with the Super-Kamiokande (SK) detector. Between December 2008 and March 2017, the Gamma-ray Coordinates Network recorded 2208 GRBs that occurred during normal SK operation. Several time windows around each GRB were used to search for coincident neutrino events. No statistically significant signal in excess of the estimated backgrounds was detected. The $\bar\nu_e$ fluence in the range from 8 MeV to 100 MeV in positron total energy for $\bar\nu_e+p\rightarrow e^{+}+n$ was found to be less than $\rm 5.07\times10^5$ cm$^{-2}$ per GRB in 90\% C.L. Upper bounds on the fluence as a function of neutrino energy were also obtained., Comment: 29 pages, 16 figures, 5 tables, accepted by PTEP

Published
2021

11. Search for proton decay via $p\to e^+\pi^0$ and $p\to \mu^+\pi^0$ with an enlarged fiducial volume in Super-Kamiokande I-IV

Author

Collaboration, Super-Kamiokande, Takenaka, A., Abe, K., Bronner, C., Hayato, Y., Ikeda, M., Imaizumi, S., Ito, H., Kameda, J., Kataoka, Y., Kato, Y., Kishimoto, Y., Marti, Ll., Miura, M., Moriyama, S., Mochizuki, T., Nagao, Y., Nakahata, M., Nakajima, Y., Nakayama, S., Okada, T., Okamoto, K., Orii, A., Pronost, G., Sekiya, H., Shiozawa, M., Sonoda, Y., Suzuki, Y., Takeda, A., Takemoto, Y., Tanaka, H., Yano, T., Akutsu, R., Han, S., Kajita, T., Okumura, K., Tashiro, T., Wang, R., Xia, J., Bravo-Berguno, D., Labarga, L., Fernandez, P., Zaldivar, B., Blaszczyk, F. d. M., Kearns, E., Raaf, J. L., Stone, J. L., Wan, L., Wester, T., Pointon, B. W., Bian, J., Griskevich, N. J., Kropp, W. R., Locke, S., Mine, S., Smy, M. B., Sobel, H. W., Takhistov, V., Weatherly, P., Ganezer, K. S., Hill, J., Kim, J. Y., Lim, I. T., Park, R. G., Bodur, B., Scholberg, K., Walter, C. W., Coffani, A., Drapier, O., Hedri, S. El, Giampaolo, A., Gonin, M., Mueller, Th. A., Paganini, P., Quilain, B., Ishizuka, T., Nakamura, T., Jang, J. S., Learned, J. G., Matsuno, S., Anthony, L. H. V., Litchfield, R. P., Sztuc, A. A., Uchida, Y., Berardi, V., Catanesi, M. G., Radicioni, E., Calabria, N. F., Machado, L. N., De Rosa, G., Collazuol, G., Iacob, F., Lamoureux, M., Ospina, N., Ludovici, L., Nishimura, Y., Cao, S., Friend, M., Hasegawa, T., Ishida, T., Jakkapu, M., Kobayashi, T., Matsubara, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Hasegawa, M., Isobe, Y., Miyabe, H., Nakano, Y., Shiozawa, T., Sugimoto, T., Suzuki, A. T., Takeuchi, Y., Yamamoto, S., Ali, A., Ashida, Y., Feng, J., Hirota, S., Ichikawa, A. K., Jiang, M., Kikawa, T., Mori, M., Nakamura, KE., Nakaya, T., Wendell, R. A., Yasutome, K., McCauley, N., Mehta, P., Pritchard, A., Tsui, K. M., Fukuda, Y., Itow, Y., Menjo, H., Niwa, T., Sato, K., Taani, M., Tsukada, M., Mijakowski, P., Frankiewicz, K., Jung, C. K., Santucci, G., Vilela, C., Wilking, M. J., Yanagisawa, C., Fukuda, D., Harada, M., Hagiwara, K., Horai, T., Ishino, H., Ito, S., Koshio, Y., Ma, W., Piplani, N., Sakai, S., Sakuda, M., Takahira, Y., Xu, C., Kuno, Y., Barr, G., Barrow, D., Cook, L., Simpson, C., Wark, D., Nova, F., Boschi, T., Di Lodovico, F., Sedgwick, S. Molina, Zsoldos, S., Yang, J. Y., Jenkins, S. J., McElwee, J. M., Thiesse, M. D., Thompson, L. F., Okazawa, H., Choi, Y., Kim, S. B., Yu, I., Nishijima, K., Koshiba, M., Iwamoto, K., Ogawa, N., Yokoyama, M., Goldsack, A., Martens, K., Vagins, M. R., Kuze, M., Tanaka, M., Yoshida, T., Inomoto, M., Ishitsuka, M., Matsumoto, R., Ohta, K., Shinoki, M., Martin, J. F., Nantais, C. M., Tanaka, H. A., Towstego, T., Hartz, M., Konaka, A., de Perio, P., Prouse, N. W., Chen, S., Xu, B. D., Posiadala-Zezula, M., Richards, B., Jamieson, B., Walker, J., Minamino, A., Pintaudi, G., and Sasaki, R.

Subjects
High Energy Physics - Experiment
Abstract

We have searched for proton decay via $p\to e^+\pi^0$ and $p\to \mu^+\pi^0$ modes with the enlarged fiducial volume data of Super-Kamiokande from April 1996 to May 2018, which corresponds to 450 kton$\cdot$years exposure. We have accumulated about 25% more livetime and enlarged the fiducial volume of the Super-Kamiokande detector from 22.5 kton to 27.2 kton for this analysis, so that 144 kton$\cdot$years of data, including 78 kton$\cdot$years of additional fiducial volume data, has been newly analyzed. No candidates have been found for $p\to e^+\pi^0$ and one candidate remains for $p\to \mu^+\pi^0$ in the conventional 22.5 kton fiducial volume and it is consistent with the atmospheric neutrino background prediction. We set lower limits on the partial lifetime for each of these modes: $\tau/B(p\to e^+\pi^0) > 2.4 \times 10^{34}$ years and $\tau/B(p\to \mu^+\pi^0) > 1.6 \times 10^{34}$ years at 90% confidence level., Comment: 16 pages, 10 figures

Published
2020
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12. Indirect Search for Dark Matter from the Galactic Center and Halo with the Super-Kamiokande Detector

Author

Collaboration, Super-Kamiokande, Abe, K., Bronner, C., Haga, Y., Hayato, Y., Ikeda, M., Imaizumi, S., Ito, H., Iyogi, K., Kameda, J., Kataoka, Y., Kato, Y., Kishimoto, Y., Marti, Ll., Miura, M., Moriyama, S., Mochizuki, T., Nagao, Y., Nakahata, M., Nakajima, Y., Nakajima, T., Nakayama, S., Okada, T., Okamoto, K., Orii, A., Pronost, G., Sekiya, H., Shiozawa, M., Sonoda, Y., Takeda, A., Takenaka, A., Tanaka, H., Tasaka, S., Tomura, T., Ueno, K., Yano, T., Yokozawa, T., Akutsu, R., Han, S., Irvine, T., Kajita, T., Kametani, I., Lee, K. P., McLachlan, T., Okumura, K., Richard, E., Tashiro, T., Wang, R., Xia, J., Bravo-Berguño, D., Labarga, L., Fernandez, P., Blaszczyk, F. d. M., Gustafson, J., Kachulis, C., Kearns, E., Raaf, J. L., Stone, J. L., Sulak, L. R., Sussman, S., Wan, L., Wester, T., Berkman, S., Tobayama, S., Bian, J., Carminati, G., Elnimr, M., Griskevich, N. J., Kropp, W. R., Locke, S., Mine, S., Renshaw, A., Smy, M. B., Sobel, H. W., Takhistov, V., Weatherly, P., Hartfiel, B. L., Hill, J., Keig, W. E., Hong, N., Kim, J. Y., Lim, I. T., Park, R. G., Akiri, T., Bodur, B., Himmel, A., Li, Z., O'Sullivan, E., Scholberg, K., Walter, C. W., Wongjirad, T., Coffani, A., Drapier, O., Hedri, S. El, Giampaolo, A., Gonin, M., Imber, J., Mueller, Th. A., Paganini, P., Quilain, B., Ishizuka, T., Nakamura, T., Jang, J. S., Choi, K., Learned, J. G., Matsuno, S., Smith, S. N., Amey, J., Anthony, L. H. V., Litchfield, R. P., Ma, W. Y., Sztuc, A. A., Uchida, Y., Wascko, M. O., Berardi, V., Catanesi, M. G., Intonti, R. A., Radicioni, E., Calabria, N. F., Machado, L. N., De Rosa, G., Collazuol, G., Iacob, F., Lamoureux, M., Ospina, N., Ludovici, L., Boschi, T., Di Lodovico, F., Sedgwick, S. Molina, Zsoldos, S., Nishimura, Y., Cao, S., Friend, M., Hasegawa, T., Ishida, T., Ishii, T., Kobayashi, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Abe, KE., Hasegawa, M., Isobe, Y., Miyabe, H., Nakano, Y., Shiozawa, T., Sugimoto, T., Suzuki, A. T., Takeuchi, Y., Yamamoto, S., Ali, A., Ashida, Y., Hayashino, T., Hiraki, T., Hirota, S., Huang, K., Ieki, K., Jiang, M., Kikawa, T., Mori, M., Murakami, A., Nakamura, KE., Nakaya, T., Patel, N. D., Suzuki, K., Takahashi, S., Tateishi, K., Wendell, R. A., McCauley, N., Mehta, P., Pritchard, A., Tsui, K. M., Fukuda, Y., Itow, Y., Menjo, H., Mitsuka, G., Murase, M., Muto, F., Niwa, T., Sato, K., Suzuki, T., Taani, M., Tsukada, z M., Mijakowski, P., Frankiewicz, K., Hignight, J., Jung, C. K., Li, X., Palomino, J. L., Santucci, G., Vilela, C., Wilking, M. J., Yanagisawa, C., Fukuda, D., Hagiwara, K., Harada, M., Horai, T., Ishino, H., Ito, S., Kayano, T., Kibayashi, A., Koshio, Y., Ma, W., Mori, T., Nagata, H., Piplani, N., Sakuda, M., Seiya, S., Takahira, Y., Xu, C., Yamaguchi, R., Kuno, Y., Barr, G., Barrow, D., Cook, L., Simpson, C., Wark, D., Nova, F., Tacik, R., Yang, J. Y., Cole, A., Jenkins, S. J., McElwee, J., Thiesse, M., Thompson, L., Okazawa, H., Kim, S. B., Choi, Y., Ito, K., Nishijima, K., Iwamoto, K., Koshiba, M., Suda, Y., Yokoyama, M., Calland, R. G., Goldsack, A., Martens, K., Murdoch, M., Suzuki, Y., Vagins, M. R., Hamabe, D., Kuze, M., Okajima, Y., Tanaka, M., Yoshida, T., Inomoto, M., Ishitsuka, M., Matsumoto, R., Ohta, K., Shinoki, M., Martin, J. F., Nantais, C. M., Tanaka, H. A., Towstego, T., Hartz, M., Konaka, A., de Perio, P., Prouse, N. W., Chen, S., Xu, B. D., Zhang, Y., Richards, B., Connolly, K., Wilkes, R. J., Jamieson, B., Walker, J., Giorgio, P., Minamino, A., and Pintaudi, G.

Subjects
High Energy Physics - Experiment
Abstract

We present a search for an excess of neutrino interactions due to dark matter in the form of Weakly Interacting Massive Particles (WIMPs) annihilating in the galactic center or halo based on the data set of Super-Kamiokande-I, -II, -III and -IV taken from 1996 to 2016. We model the neutrino flux, energy, and flavor distributions assuming WIMP self-annihilation is dominant to $\nu \overline{\nu}$, $\mu^+\mu^-$, $b\overline{b}$, or $W^+W^-$. The excess is in comparison to atmospheric neutrino interactions which are modeled in detail and fit to data. Limits on the self-annihilation cross section $\langle \sigma_{A} V \rangle$ are derived for WIMP masses in the range 1 GeV to 10 TeV, reaching as low as $9.6 \times10^{-23}$ cm$^3$ s$^{-1}$ for 5 GeV WIMPs in $b\bar b$ mode and $1.2 \times10^{-24}$ cm$^3$ s$^{-1}$ for 1 GeV WIMPs in $\nu \bar \nu$ mode. The obtained sensitivity of the Super-Kamiokande detector to WIMP masses below several tens of GeV is the best among similar indirect searches to date., Comment: 13 pages, 12 figures, Submitted to Phys. Rev. D

Published
2020
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13. Search for proton decay into three charged leptons in 0.37 megaton-years exposure of the Super-Kamiokande

Author

Collaboration, Super-Kamiokande, Tanaka, M., Abe, K., Bronner, C., Hayato, Y., Ikeda, M., Imaizumi, S., Ito, H., Kameda, J., Kataoka, Y., Kato, Y., Kishimoto, Y., Marti, Ll., Miura, M., Moriyama, S., Mochizuki, T., Nakahata, M., Nakajima, Y., Nakayama, S., Okada, T., Okamoto, K., Orii, A., Pronost, G., Sekiya, H., Shiozawa, M., Sonoda, Y., Takeda, A., Takenaka, A., Tanaka, H., Yano, T., Akutsu, R., Kajita, T., Okumura, K., Wang, R., Xia, J., Bravo-Berguño, D., Labarga, L., Fernandez, P., Blaszczyk, F. d. M., Kearns, E., Raaf, J. L., Stone, J. L., Wan, L., Wester, T., Bian, J., Griskevich, N. J., Kropp, W. R., Locke, S., Mine, S., Smy, M. B., Sobel, H. W., Takhistov, V., Weatherly, P., Hill, J., Kim, J. Y., Lim, I. T., Park, R. G., Bodur, B., Scholberg, K., Walter, C. W., Coffani, A., Drapier, O., Hedri, S. El, Gonin, M., Mueller, Th. A., Paganini, P., Ishizuka, T., Nakamura, T., Jang, J. S., Learned, J. G., Matsuno, S., Litchfield, R. P., Sztuc, A. A., Uchida, Y., Berardi, V., Catanesi, M. G., Radicioni, E., Calabria, N. F., De Rosa, G., Collazuol, G., Iacob, F., Ludovici, L., Nishimura, Y., Cao, S., Friend, M., Hasegawa, T., Ishida, T., Kobayashi, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Hasegawa, M., Isobe, Y., Miyabe, H., Nakano, Y., Shiozawa, T., Sugimoto, T., Suzuki, A. T., Takeuchi, Y., Ali, A., Ashida, Y., Hirota, S., Jiang, M., Kikawa, T., Mori, M., Nakamura, KE., Nakaya, T., Wendell, R. A., Anthony, L. H. V., McCauley, N., Mehta, P., Pritchard, A., Tsui, K. M., Fukuda, Y., Itow, Y., Niwa, T., Taani, M., Tsukada, M., Mijakowski, P., Frankiewicz, K., Jung, C. K., Vilela, C., Wilking, M. J., Yanagisawa, C., Fukuda, D., Harada, M., Hagiwara, K., Horai, T., Ishino, H., Ito, S., Koshio, Y., Sakuda, M., Takahira, Y., Xu, C., Kuno, Y., Barrow, D., Cook, L., Simpson, C., Wark, D., Nova, F., Boschi, T., Di Lodovico, F., Sedgwick, S. Molina, Zsoldos, S., Kim, S. B., Yang, J. Y., Thiesse, M., Thompson, L., Okazawa, H., Choi, Y., Nishijima, K., Koshiba, M., Yokoyama, M., Goldsack, A., Martens, K., Quilain, B., Suzuki, Y., Vagins, M. R., Kuze, M., Yoshida, T., Ishitsuka, M., Matsumoto, R., Ohta, K., Martin, J. F., Nantais, C. M., Tanaka, H. A., Towstego, T., Hartz, M., Konaka, A., de Perio, P., Prouse, N. W., Chen, S., Xu, B. D., Richards, B., Jamieson, B., Walker, J., Minamino, A., and Pintaudi, G.

Subjects
High Energy Physics - Experiment
Abstract

A search for proton decay into three charged leptons has been performed by using 0.37$\,$Mton$\cdot$years of data collected in Super-Kamiokande. All possible combinations of electrons, muons and their anti-particles consistent with charge conservation were considered as decay modes. No significant excess of events has been found over the background, and lower limits on the proton lifetime divided by the branching ratio have been obtained. The limits range between $9.2\times10^{33}$ to $3.4\times10^{34}$ years at 90$\,$% confidence level, improving by more than an order of magnitude upon limits from previous experiments. A first limit has been set for the $p\rightarrow\mu^-e^+e^+$ mode.

Published
2020
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15. Search for Astronomical Neutrinos from Blazar TXS0506+056 in Super-Kamiokande

Author

Hagiwara, K., Abe, K., Bronner, C., Hayato, Y., Ikeda, M., Ito, H., Kameda, J., Kataoka, Y., Kato, Y., Kishimoto, Y., Marti, Ll., Miura, M., Moriyama, S., Mochizuki, T., Nakahata, M., Nakajima, Y., Nakayama, S., Okada, T., Okamoto, K., Orii, A., Pronost, G., Sekiya, H., Shiozawa, M., Sonoda, Y., Takeda, A., Takenaka, A., Tanaka, H., Yano, T., Akutsu, R., Kajita, T., Okumura, K., Wang, R., Xia, J., Bravo-Berguno, D., Labarga, L., Fernandez, P., Blaszczyk, F. d. M., Kearns, E., Raaf, J. L., Stone, J. L., Wan, L., Wester, T., Bian, J., Griskevich, N. J., Kropp, W. R., Locke, S., Mine, S., Smy, M. B., Sobel, H. W., Takhistov, V., Weatherly, P., Ganezer, K. S., Hill, J., Kim, J. Y., Lim, I. T., Park, R. G., Bodur, B., Scholberg, K., Walter, C. W., Coffani, A., Drapier, O., Gonin, M., Mueller, Th. A., Paganini, P., Ishizuka, T., Nakamura, T., Jang, J. S., Learned, J. G., Matsuno, S., Litchfield, R. P., Sztuc, A. A., Uchida, Y., Berardi, V., Calabria, N. F., Catanesi, M. G., Radicioni, E., De Rosa, G., Collazuol, G., Iacob, F., Ludovici, L., Nishimura, Y., Cao, S., Friend, M., Hasegawa, T., Ishida, T., Kobayashi, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Hasegawa, M., Isobe, Y., Miyabe, H., Nakano, Y., Shiozawa, T., Sugimoto, T., Suzuki, A. T., Takeuchi, Y., Ali, A., Ashida, Y., Hirota, S., Jiang, M., Kikawa, T., Mori, M., Nakamura, KE., Nakaya, T., Wendell, R. A., Anthony, L. H. V., McCauley, N., Pritchard, A., Tsui, K. M., Fukuda, Y., Itow, Y., Niwa, T., Taani, M., Tsukada, M., Mijakowski, P., Frankiewicz, K., Jung, C. K., Vilela, C., Wilking, M. J., Yanagisawa, C., Fukuda, D., Harada, M., Horai, T., Ishino, H., Ito, S., Koshio, Y., Sakuda, M., Takahira, Y., Xu, C., Kuno, Y., Cook, L., Simpson, C., Wark, D., Di Lodovico, F., Sedgwick, S. Molina, Richards, B., Zsoldos, S., Kim, S. B., Thiesse, M., Thompson, L., Okazawa, H., Choi, Y., Nishijima, K., Koshiba, M., Yokoyama, M., Goldsack, A., Martens, K., Quilain, B., Suzuki, Y., Vagins, M. R., Kuze, M., Tanaka, M., Yoshida, T., Ishitsuka, M., Matsumoto, R., Ohta, K., Martin, J. F., Nantais, C. M., Tanaka, H. A., Towstego, T., Hartz, M., Konaka, A., de Perio, P., Chen, S., Jamieson, B., Walker, J., Minamino, A., and Pintaudi, G.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We report a search for astronomical neutrinos in the energy region from several GeV to TeV in the direction of the blazar TXS0506+056 using the Super-Kamiokande detector following the detection of a 100 TeV neutrino from the same location by the IceCube collaboration. Using Super-Kamiokande neutrino data across several data samples observed from April 1996 to February 2018 we have searched for both a total excess above known backgrounds across the entire period as well as localized excesses on smaller time scales in that interval. No significant excess nor significant variation in the observed event rate are found in the blazar direction. Upper limits are placed on the electron and muon neutrino fluxes at 90\% confidence level as $6.03 \times 10^{-7}$ and $4.52 \times 10^{-7}$ to $9.26 \times 10^{-10}$ [${\rm erg}/{\rm cm}^2/{\rm s}$], respectively.

Published
2019
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16. Sensitivity of Super-Kamiokande with Gadolinium to Low Energy Anti-neutrinos from Pre-supernova Emission

Author

Simpson, C., Abe, K., Bronner, C., Hayato, Y., Ikeda, M., Ito, H., Iyogi, K., Kameda, J., Kataoka, Y., Kato, Y., Kishimoto, Y., Marti, Ll., Miura, M., Moriyama, S., Mochizuki, T., Nakahata, M., Nakajima, Y., Nakayama, S., Okada, T., Okamoto, K., Orii, A., Pronost, G., Sekiya, H., Shiozawa, M., Sonoda, Y., Takeda, A., Takenaka, A., Tanaka, H., Yano, T., Akutsu, R., Kajita, T., Okumura, K., Wang, R., Xia, J., Bravo-Berguño, D., Labarga, L., Fernandez, P., Blaszczyk, F. d. M., Kachulis, C., Kearns, E., Raaf, J. L., Stone, J. L., Wan, L., Wester, T., Sussman, S., Berkman, S., Bian, J., Griskevich, N. J., Kropp, W. R., Locke, S., Mine, S., Smy, M. B., Sobel, H. W., Takhistov, V., Weatherly, P., Ganezer, K. S., Hill, J., Kim, J. Y., Lim, I. T., Park, R. G., Bodur, B., Scholberg, K., Walter, C. W., Coffani, A., Drapier, O., Gonin, M., Imber, J., Mueller, Th. A., Paganini, P., Ishizuka, T., Nakamura, T., Jang, J. S., Choi, K., Learned, J. G., Matsuno, S., Litchfield, R. P., Sztuc, A. A., Uchida, Y., Wascko, M. O., Berardi, V., Calabria, N. F., Catanesi, M. G., Intonti, R. A., Radicioni, E., De Rosa, G., Collazuol, G., Iacob, F., Ludovici, L., Nishimura, Y., Cao, S., Friend, M., Hasegawa, T., Ishida, T., Kobayashi, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Abe, KE., Hasegawa, M., Isobe, Y., Miyabe, H., Nakano, Y., Shiozawa, T., Sugimoto, T., Suzuki, A. T., Takeuchi, Y., Ali, A., Ashida, Y., Hayashino, T., Hirota, S., Jiang, M., Kikawa, T., Mori, M., Nakamura, KE., Nakaya, T., Wendell, R. A., Anthony, L. H. V., McCauley, N., Pritchard, A., Tsui, K. M., Fukuda, Y., Itow, Y., Murrase, M., Niwa, T., Taani, M., Tsukada, M., Mijakowski, P., Frankiewicz, K., Jung, C. K., Li, X., Palomino, J. L., Santucci, G., Vilela, C., Wilking, M. J., Yanagisawa, C., Fukuda, D., Harada, M., Hagiwara, K., Horai, T., Ishino, H., Ito, S., Koshio, Y., Sakuda, M., Takahira, Y., Xu, C., Kuno, Y., Cook, L., Wark, D., Di Lodovico, F., Sedgwick, S. Molina, Richards, B., Zsoldos, S., Kim, S. B., Tacik, R., Thiesse, M., Thompson, L., Okazawa, H., Choi, Y., Nishijima, K., Koshiba, M., Yokoyama, M., Goldsack, A., Martens, K., Murdoch, M., Quilain, B., Suzuki, Y., Vagins, M. R., Kuze, M., Okajima, Y., Tanaka, M., Yoshida, T., Ishitsuka, M., Matsumoto, R., Ohta, K., Martin, J. F., Nantais, C. M., Tanaka, H. A., Towstego, T., Hartz, M., Konaka, A., de Perio, P., Chen, S., Jamieson, B., Walker, J., Minamino, A., and Pintaudi, G.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Supernova detection is a major objective of the Super-Kamiokande (SK) experiment. In the next stage of SK (SK-Gd), gadolinium (Gd) sulfate will be added to the detector, which will improve the ability of the detector to identify neutrons. A core-collapse supernova will be preceded by an increasing flux of neutrinos and anti-neutrinos, from thermal and weak nuclear processes in the star, over a timescale of hours; some of which may be detected at SK-Gd. This could provide an early warning of an imminent core-collapse supernova, hours earlier than the detection of the neutrinos from core collapse. Electron anti-neutrino detection will rely on inverse beta decay events below the usual analysis energy threshold of SK, so Gd loading is vital to reduce backgrounds while maximising detection efficiency. Assuming normal neutrino mass ordering, more than 200 events could be detected in the final 12 hours before core collapse for a 15-25 solar mass star at around 200 pc, which is representative of the nearest red supergiant to Earth, $\mathrm{\alpha}$Ori (Betelgeuse). At a statistical false alarm rate of 1 per century, detection could be up to 10 hours before core collapse, and a pre-supernova star could be detected by SK-Gd up to 600 pc away. A pre-supernova alert could be provided to the astrophysics community following gadolinium loading., Comment: 20 pages, 12 figures. Accepted by The Astrophysical Journal

Published
2019
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17. Measurement of neutrino-oxygen neutral-current quasi-elastic cross section using atmospheric neutrinos at Super-Kamiokande

Author

Collaboration, Super-Kamiokande, Wan, L., Abe, K., Bronner, C., Hayato, Y., Ikeda, M., Iyogi, K., Kameda, J., Kato, Y., Kishimoto, Y., Marti, Ll., Miura, M., Moriyama, S., Mochizuki, T., Nakahata, M., Nakajima, Y., Nakano, Y., Nakayama, S., Okada, T., Okamoto, K., Orii, A., Pronost, G., Sekiya, H., Shiozawa, M., Sonoda, Y., Takeda, A., Takenaka, A., Tanaka, H., Yano, T., Akutsu, R., Kajita, T., Nishimura, Y., Okumura, K., Wang, R., Xia, J., Labarga, L., Fernandez, P., Blaszczyk, F. d. M., Kachulis, C., Kearns, E., Raaf, J. L., Stone, J. L., Sussman, S., Berkman, S., Bian, J., Griskevich, N. J., Kropp, W. R., Locke, S., Mine, S., Weatherly, P., Smy, M. B., Sobel, H. W., Takhistov, V., Ganezer, K. S., Hill, J., Kim, J. Y., Lim, I. T., Park, R. G., Bodur, B., Scholberg, K., Walter, C. W., Gonin, M., Imber, J., Mueller, Th. A., Ishizuka, T., Nakamura, T., Jang, J. S., Choi, K., Learned, J. G., Matsuno, S., Litchfield, R. P., Uchida, Y., Wascko, M. O., Calabria, N. F., Catanesi, M. G., Intonti, R. A., Radicioni, E., De Rosa, G., Ali, A., Collazuol, G., Iacob, F., Ludovici, L., Cao, S., Friend, M., Hasegawa, T., Ishida, T., Kobayashi, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Abe, KE., Hasegawa, M., Isobe, Y., Miyabe, H., Sugimoto, T., Suzuki, A. T., Takeuchi, Y., Ashida, Y., Hayashino, T., Hirota, S., Jiang, M., Kikawa, T., Mori, M., Nakamura, KE., Nakaya, T., Wendell, R. A., Anthony, L. H. V., McCauley, N., Pritchard, A., Tsui, K. M., Fukuda, Y., Itow, Y., Murrase, M., Mijakowski, P., Frankiewicz, K., Jung, C. K., Li, X., Palomino, J. L., Santucci, G., Vilela, C., Wilking, M. J., Yanagisawa, C., Fukuda, D., Hagiwara, K., Ishino, H., Ito, S., Koshio, Y., Sakuda, M., Takahira, Y., Xu, C., Kuno, Y., Simpson, C., Wark, D., Di Lodovico, F., Richards, B., Sedgwick, S. Molina, Tacik, R., Kim, S. B., Thiesse, M., Thompson, L., Okazawa, H., Choi, Y., Nishijima, K., Koshiba, M., Yokoyama, M., Goldsack, A., Martens, K., Murdoch, M., Quilain, B., Suzuki, Y., Vagins, M. R., Kuze, M., Okajima, Y., Yoshida, T., Ishitsuka, M., Martin, J. F., Nantais, C. M., Tanaka, H. A., Towstego, T., Hartz, M., Konaka, A., de Perio, P., Chen, S., and Minamino, A.

Subjects
High Energy Physics - Experiment
Abstract

Neutral current (NC) interactions of atmospheric neutrinos on oxygen form one of the major backgrounds in the search for supernova relic neutrinos with water-based Cherenkov detectors. The NC channel is dominated by neutrino quasi-elastic (NCQE) scattering off nucleons inside $^{16}$O nuclei. In this paper we report the first measurement of NCQE cross section using atmospheric neutrinos at Super-Kamiokande (SK). The measurement used 2,778 live days of SK-IV data with a fiducial volume of 22.5 kiloton water. Within the visible energy window of 7.5-29.5 MeV, we observed $117$ events compared to the expected $71.9$ NCQE signal and $53.1$ background events. Weighted by the atmospheric neutrino spectrum from 160 MeV to 10 GeV, the flux averaged NCQE cross section is measured to be $(1.01\pm0.17(\text{stat.})^{+0.78}_{-0.30}(\text{sys.}))\times10^{-38}$ cm$^2$., Comment: 11 pages, 9 figures, submitted to PRD

Published
2019
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18. Atmospheric Neutrino Oscillation Analysis With Improved Event Reconstruction in Super-Kamiokande IV

Author

Collaboration, Super-Kamiokande, Jiang, M., Abe, K., Bronner, C., Hayato, Y., Ikeda, M., Iyogi, K., Kameda, J., Kato, Y., Kishimoto, Y., Marti, Ll., Miura, M., Moriyama, S., Mochizuki, T., Nakahata, M., Nakajima, Y., Nakano, Y., Nakayama, S., Okada, T., Okamoto, K., Orii, A., Pronost, G., Sekiya, H., Shiozawa, M., Sonoda, Y., Takeda, A., Takenaka, A., Tanaka, H., Yano, T., Akutsu, R., Kajita, T., Nishimura, Y., Okumura, K., Wang, R., Xia, J., Labarga, L., Fernandez, P., Blaszczyk, F. d. M., Kachulis, C., Kearns, E., Raaf, J. L., Stone, J. L., Sussman, S., Berkman, S., Bian, J., Griskevich, N. J., Kropp, W. R., Locke, S., Mine, S., Weatherly, P., Smy, M. B., Sobel, H. W., Takhistov, V., Ganezer, K. S., Hill, J., Kim, J. Y., Lim, I. T., Park, R. G., Bodur, B., Scholberg, K., Walter, C. W., Drapier, O., Gonin, M., Imber, J., Mueller, Th. A., Paganini, P., Ishizuka, T., Nakamura, T., Jang, J. S., Choi, K., Learned, J. G., Matsuno, S., Litchfield, R. P., Sztuc, A. A., Uchida, Y., Wascko, M. O., Calabria, N. F., Catanesi, M. G., Intonti, R. A., Radicioni, E., De Rosa, G., Ali, A., Collazuol, G., Iacob, F., Ludovici, L., Cao, S., Friend, M., Hasegawa, T., Ishida, T., Kobayashi, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Abe, KE., Hasegawa, M., Isobe, Y., Miyabe, H., Sugimoto, T., Suzuki, A. T., Takeuchi, Y., Ashida, Y., Hayashino, T., Hirota, S., Kikawa, T., Mori, M., Nakamura, KE., Nakaya, T., Wendell, R. A., Anthony, L. H. V., McCauley, N., Pritchard, A., Tsui, K. M., Fukuda, Y., Itow, Y., Murrase, M., Mijakowski, P., Frankiewicz, K., Jung, C. K., Li, X., Palomino, J. L., Santucci, G., Vilela, C., Wilking, M. J., Yanagisawa, C., Fukuda, D., Hagiwara, K., Ishino, H., Ito, S., Koshio, Y., Sakuda, M., Takahira, Y., Xu, C., Kuno, Y., Simpson, C., Wark, D., Di Lodovico, F., Richards, B., Sedgwick, S. Molina, Tacik, R., Kim, S. B., Thiesse, M., Thompson, L., Okazawa, H., Choi, Y., Nishijima, K., Koshiba, M., Yokoyama, M., Goldsack, A., Martens, K., Murdoch, M., Quilain, B., Suzuki, Y., Vagins, M. R., Kuze, M., Okajima, Y., Yoshida, T., Ishitsuka, M., Martin, J. F., Nantais, C. M., Tanaka, H. A., Towstego, T., Hartz, M., Konaka, A., de Perio, P., Chen, S., Wan, L., and Minamino, A.

Subjects
High Energy Physics - Experiment
Abstract

A new event reconstruction algorithm based on a maximum likelihood method has been developed for Super-Kamiokande. Its improved kinematic and particle identification capabilities enable the analysis of atmospheric neutrino data in a detector volume 32% larger than previous analyses and increases sensitivity to the neutrino mass hierarchy. Analysis of a 253.9 kton-year exposure of the Super-Kamiokande IV atmospheric neutrino data has yielded a weak preference for the normal hierarchy, disfavoring the inverted hierarchy at 74% assuming oscillations at the best fit of the analysis., Comment: 42 pages, 28 figures, submitted to PTEP

Published
2019
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19. Search for proton decay into three charged leptons in 0.37 megaton-years exposure of the Super-Kamiokande

Author

Tanaka, M, Abe, K, Bronner, C, Hayato, Y, Ikeda, M, Imaizumi, S, Ito, H, Kameda, J, Kataoka, Y, Kato, Y, Kishimoto, Y, Marti, Ll, Miura, M, Moriyama, S, Mochizuki, T, Nakahata, M, Nakajima, Y, Nakayama, S, Okada, T, Okamoto, K, Orii, A, Pronost, G, Sekiya, H, Shiozawa, M, Sonoda, Y, Takeda, A, Takenaka, A, Tanaka, H, Yano, T, Akutsu, R, Kajita, T, Okumura, K, Wang, R, Xia, J, Bravo-Berguño, D, Labarga, L, Fernandez, P, Blaszczyk, FDM, Kearns, E, Raaf, JL, Stone, JL, Wan, L, Wester, T, Bian, J, Griskevich, NJ, Kropp, WR, Locke, S, Mine, S, Smy, MB, Sobel, HW, Takhistov, V, Weatherly, P, Hill, J, Kim, JY, Lim, IT, Park, RG, Bodur, B, Scholberg, K, Walter, CW, Coffani, A, Drapier, O, Hedri, S El, Gonin, M, Mueller, Th A, Paganini, P, Ishizuka, T, Nakamura, T, Jang, JS, Learned, JG, Matsuno, S, Litchfield, RP, Sztuc, AA, Uchida, Y, Berardi, V, Catanesi, MG, Radicioni, E, Calabria, NF, De Rosa, G, Collazuol, G, Iacob, F, Ludovici, L, Nishimura, Y, Cao, S, Friend, M, Hasegawa, T, Ishida, T, Kobayashi, T, Nakadaira, T, Nakamura, K, Oyama, Y, Sakashita, K, Sekiguchi, T, Tsukamoto, T, Hasegawa, M, Isobe, Y, Miyabe, H, Nakano, Y, Shiozawa, T, Sugimoto, T, and Suzuki, AT

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

A search for proton decay into three charged leptons has been performed by using 0.37 Mton·years of data collected in Super-Kamiokande. All possible combinations of electrons, muons, and their antiparticles consistent with charge conservation were considered as decay modes. No significant excess of events has been found over the background, and lower limits on the proton lifetime divided by the branching ratio have been obtained. The limits range between 9.2×1033 and 3.4×1034 years at 90% confidence level, improving by more than an order of magnitude upon limits from previous experiments. A first limit has been set for the p→μ-e+e+ mode.

Published
2020

20. Search for Astronomical Neutrinos from Blazar TXS 0506+056 in Super-Kamiokande

Author

Hagiwara, K, Abe, K, Bronner, C, Hayato, Y, Ikeda, M, Ito, H, Kameda, J, Kataoka, Y, Kato, Y, Kishimoto, Y, Marti, Ll, Miura, M, Moriyama, S, Mochizuki, T, Nakahata, M, Nakajima, Y, Nakayama, S, Okada, T, Okamoto, K, Orii, A, Pronost, G, Sekiya, H, Shiozawa, M, Sonoda, Y, Takeda, A, Takenaka, A, Tanaka, H, Yano, T, Akutsu, R, Kajita, T, Okumura, K, Wang, R, Xia, J, Bravo-Berguño, D, Labarga, L, Fernandez, P, Blaszczyk, FDM, Kearns, E, Raaf, JL, Stone, JL, Wan, L, Wester, T, Bian, J, Griskevich, NJ, Kropp, WR, Locke, S, Mine, S, Smy, MB, Sobel, HW, Takhistov, V, Weatherly, P, Ganezer, KS, Hill, J, Kim, JY, Lim, IT, Park, RG, Bodur, B, Scholberg, K, Walter, CW, Coffani, A, Drapier, O, Gonin, M, Mueller, Th A, Paganini, P, Ishizuka, T, Nakamura, T, Jang, JS, Learned, JG, Matsuno, S, Litchfield, RP, Sztuc, AA, Uchida, Y, Berardi, V, Calabria, NF, Catanesi, MG, Radicioni, E, De Rosa, G, Collazuol, G, Iacob, F, Ludovici, L, Nishimura, Y, Cao, S, Friend, M, Hasegawa, T, Ishida, T, Kobayashi, T, Nakadaira, T, Nakamura, K, Oyama, Y, Sakashita, K, Sekiguchi, T, Tsukamoto, T, Hasegawa, M, Isobe, Y, Miyabe, H, Nakano, Y, Shiozawa, T, Sugimoto, T, Suzuki, AT, and Takeuchi, Y

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, astro-ph.HE, Astronomical and Space Sciences, Astronomy & Astrophysics, Astronomical sciences, Space sciences
Abstract

We report a search for astronomical neutrinos in the energy region from several GeV to TeV in the direction of the blazar TXS 0506+056 using the Super-Kamiokande detector following the detection of a 100 TeV neutrinos from the same location by the IceCube collaboration. Using Super-Kamiokande neutrino data across several data samples observed from 1996 April to 2018 February we have searched for both a total excess above known backgrounds across the entire period as well as localized excesses on smaller timescales in that interval. No significant excess nor significant variation in the observed event rate are found in the blazar direction. Upper limits are placed on the electron-and muon-neutrino fluxes at the 90% confidence level as 6.0 × 10-7 and 4.5 × 10-7-9.3 × 10-10 [erg cm-2 s-1], respectively.

Published
2019

21. Dinucleon and Nucleon Decay to Two-Body Final States with no Hadrons in Super-Kamiokande

Author

Collaboration, Super-Kamiokande, Sussman, S., Abe, K., Bronner, C., Hayato, Y., Ikeda, M., Iyogi, K., Kameda, J., Kato, Y., Kishimoto, Y., Marti, Ll., Miura, M., Moriyama, S., Mochizuki, T., Nakahata, M., Nakajima, Y., Nakano, Y., Nakayama, S., Okada, T., Okamoto, K., Orii, A., Pronost, G., Sekiya, H., Shiozawa, M., Sonoda, Y., Takeda, A., Takenaka, A., Tanaka, H., Yano, T., Akutsu, R., Kajita, T., Nishimura, Y., Okumura, K., Wang, R., Xia, J., Labarga, L., Fernandez, P., Blaszczyk, F. d. M., Kachulis, C., Kearns, E., Raaf, J. L., Stone, J. L., Berkman, S., Bian, J., Griskevich, N. J., Kropp, W. R., Locke, S., Mine, S., Weatherly, P., Smy, M. B., Sobel, H. W., Takhistov, V., Ganezer, K. S., Hill, J., Kim, J. Y., Lim, I. T., Park, R. G., Bodur, B., Scholberg, K., Walter, C. W., Drapier, O., Gonin, M., Imber, J., Mueller, Th. A., Paganini, P., Ishizuka, T., Nakamura, T., Jang, J. S., Choi, K., Learned, J. G., Matsuno, S., Litchfield, R. P., Sztuc, A. A., Uchida, Y., Wascko, M. O., Calabria, N. F., Catanesi, M. G., Intonti, R. A., Radicioni, E., De Rosa, G., Ali, A., Collazuol, G., Iacob, F., Ludovici, L., Cao, S., Friend, M., Hasegawa, T., Ishida, T., Kobayashi, T., Nakadaira, T., Nakamura, K., Oyama, Y., Sakashita, K., Sekiguchi, T., Tsukamoto, T., Abe, KE., Hasegawa, M., Isobe, Y., Miyabe, H., Sugimoto, T., Suzuki, A. T., Takeuchi, Y., Ashida, Y., Hayashino, T., Hirota, S., Jiang, M., Kikawa, T., Mori, M., Nakamura, KE., Nakaya, T., Wendell, R. A., Anthony, L. H. V., McCauley, N., Pritchard, A., Tsui, K. M., Fukuda, Y., Itow, Y., Murrase, M., Mijakowski, P., Frankiewicz, K., Jung, C. K., Li, X., Palomino, J. L., Santucci, G., Vilela, C., Wilking, M. J., Yanagisawa, C., Fukuda, D., Hagiwara, K., Ishino, H., Ito, S., Koshio, Y., Sakuda, M., Takahira, Y., Xu, C., Kuno, Y., Simpson, C., Wark, D., Di Lodovico, F., Richards, B., Sedgwick, S. Molina, Tacik, R., Kim, S. B., Thiesse, M., Thompson, L., Okazawa, H., Choi, Y., Nishijima, K., Koshiba, M., Yokoyama, M., Goldsack, A., Martens, K., Murdoch, M., Quilain, B., Suzuki, Y., Vagins, M. R., Kuze, M., Okajima, Y., Yoshida, T., Ishitsuka, M., Martin, J. F., Nantais, C. M., Tanaka, H. A., Towstego, T., Hartz, M., Konaka, A., de Perio, P., Chen, S., Wan, L., and Minamino, A.

Subjects
High Energy Physics - Experiment
Abstract

Using 0.37 megaton$\cdot$years of exposure from the Super-Kamiokande detector, we search for 10 dinucleon and nucleon decay modes that have a two-body final state with no hadrons. These baryon and lepton number violating modes have the potential to probe theories of unification and baryogenesis. For five of these modes the searches are novel, and for the other five modes we improve the limits by more than one order of magnitude. No significant evidence for dinucleon or nucleon decay is observed and we set lower limits on the partial lifetime of oxygen nuclei and on the nucleon partial lifetime that are above $4\times 10^{33}$ years for oxygen via the dinucleon decay modes and up to about $4 \times 10^{34}$ years for nucleons via the single nucleon decay modes.

Published
2018

22. Atmospheric neutrino oscillation analysis with improved event reconstruction in Super-Kamiokande IV

Author

Jiang, M, Abe, K, Bronner, C, Hayato, Y, Ikeda, M, Iyogi, K, Kameda, J, Kato, Y, Kishimoto, Y, Marti, LL, Miura, M, Moriyama, S, Mochizuki, T, Nakahata, M, Nakajima, Y, Nakano, Y, Nakayama, S, Okada, T, Okamoto, K, Orii, A, Pronost, G, Sekiya, H, Shiozawa, M, Sonoda, Y, Takeda, A, Takenaka, A, Tanaka, H, Yano, T, Akutsu, R, Kajita, T, Nishimura, Y, Okumura, K, Wang, R, Xia, J, Labarga, L, Fernandez, P, Blaszczyk, FDM, Kachulis, C, Kearns, E, Raaf, JL, Stone, JL, Sussman, S, Berkman, S, Bian, J, Griskevich, NJ, Kropp, WR, Locke, S, Mine, S, Weatherly, P, Smy, MB, Sobel, HW, Takhistov, V, Ganezer, KS, Hill, J, Kim, JY, Lim, IT, Park, RG, Bodur, B, Scholberg, K, Walter, CW, Gonin, M, Imber, J, Mueller, Th A, Ishizuka, T, Nakamura, T, Jang, JS, Choi, K, Learned, JG, Matsuno, S, Litchfield, RP, Uchida, Y, Wascko, MO, Calabria, NF, Catanesi, MG, Intonti, RA, Radicioni, E, De Rosa, G, Ali, A, Collazuol, G, Iacob, F, Ludovici, L, Cao, S, Friend, M, Hasegawa, T, Ishida, T, Kobayashi, T, Nakadaira, T, Nakamura, K, Oyama, Y, Sakashita, K, Sekiguchi, T, Tsukamoto, T, Abe, KE, Hasegawa, M, Isobe, Y, Miyabe, H, Sugimoto, T, Suzuki, AT, Takeuchi, Y, and Ashida, Y

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Mathematical Sciences
Abstract

A new event reconstruction algorithm based on a maximum likelihood method has been developed for Super-Kamiokande. Its improved kinematic and particle identification capabilities enable the analysis of atmospheric neutrino data in a detector volume 32% larger than previous analyses and increase the sensitivity to the neutrino mass hierarchy.Analysis of a 253.9 kton•year exposure of the Super-Kamiokande IV atmospheric neutrino data has yielded a weak preference for the normal hierarchy, disfavoring the inverted hierarchy at 74% assuming oscillations at the best fit of the analysis.

Published
2019

23. Measurement of the neutrino-oxygen neutral-current quasielastic cross section using atmospheric neutrinos at Super-Kamiokande

Author

Wan, L, Abe, K, Bronner, C, Hayato, Y, Ikeda, M, Iyogi, K, Kameda, J, Kato, Y, Kishimoto, Y, Marti, Ll, Miura, M, Moriyama, S, Mochizuki, T, Nakahata, M, Nakajima, Y, Nakano, Y, Nakayama, S, Okada, T, Okamoto, K, Orii, A, Pronost, G, Sekiya, H, Shiozawa, M, Sonoda, Y, Takeda, A, Takenaka, A, Tanaka, H, Yano, T, Akutsu, R, Kajita, T, Nishimura, Y, Okumura, K, Wang, R, Xia, J, Labarga, L, Fernandez, P, Blaszczyk, FDM, Kachulis, C, Kearns, E, Raaf, JL, Stone, JL, Sussman, S, Berkman, S, Bian, J, Griskevich, NJ, Kropp, WR, Locke, S, Mine, S, Weatherly, P, Smy, MB, Sobel, HW, Takhistov, V, Ganezer, KS, Hill, J, Kim, JY, Lim, IT, Park, RG, Bodur, B, Scholberg, K, Walter, CW, Gonin, M, Imber, J, Mueller, Th A, Ishizuka, T, Nakamura, T, Jang, JS, Choi, K, Learned, JG, Matsuno, S, Litchfield, RP, Uchida, Y, Wascko, MO, Calabria, NF, Catanesi, MG, Intonti, RA, Radicioni, E, De Rosa, G, Ali, A, Collazuol, G, Iacob, F, Ludovici, L, Cao, S, Friend, M, Hasegawa, T, Ishida, T, Kobayashi, T, Nakadaira, T, Nakamura, K, Oyama, Y, Sakashita, K, Sekiguchi, T, Tsukamoto, T, Abe, KE, Hasegawa, M, Isobe, Y, Miyabe, H, Sugimoto, T, Suzuki, AT, Takeuchi, Y, and Ashida, Y

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract

Neutral current (NC) interactions of atmospheric neutrinos on oxygen form one of the major backgrounds in the search for supernova relic neutrinos with water-based Cherenkov detectors. The NC channel is dominated by neutrino quasielastic (NCQE) scattering off nucleons inside O16 nuclei. In this paper we report the first measurement of NCQE cross section using atmospheric neutrinos at Super-Kamiokande (SK). The measurement used 2,778 live days of SK-IV data with a fiducial volume of 22.5 kiloton water. Within the visible energy window of 7.5-29.5 MeV, we observed 117 events compared to the expected 71.9 NCQE signal and 53.1 background events. Weighted by the atmospheric neutrino spectrum from 160 MeV to 10 GeV, the flux averaged NCQE cross section is measured to be (1.01±0.17(stat.)-0.30+0.78(sys.))×10-38 cm2.

Published
2019

24. Magnetization plateaus in the spin-1/2 antiferromagnetic Heisenberg model on a kagome-strip chain

Author

Morita, K., Sugimoto, T., Sota, S., and Tohyama, T.

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

Spin-1/2 Heisenberg model on kagome lattice is a typical frustrated quantum spin system. A basic structure of kagome lattice is also present in kagome-strip lattice in one dimension, where a similar type of frustration is expected. We thus study the magnetization plateaus of the spin-1/2 Heisenberg model on a kagome-strip chain with three-independent antiferromagnetic exchange interactions by the density-matrix renormalization group method. In a certain range of exchange parameters, we find twelve kinds of magnetization plateaus, nine of which have magnetic structures breaking either translational or reflection symmetry spontaneously. The structures are classified by an array of five-site unit cells with specific bond-spin correlations. In a case with nontrivial plateau, 3/10 plateau, we find long-period magnetic structure with a period of four unit cells.

Published
2017
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25. Cluster-based Haldane state in edge-shared tetrahedral spin-cluster chain: Fedotovite K$_2$Cu$_3$O(SO$_4$)$_3$

Author

Fujihala, M., Sugimoto, T., Tohyama, T., Mitsuda, S., Mole, R. A., Yu, D. H., Yano, S., Inagaki, Y., Morodomi, H., Kawae, T., Sagayama, H., Kumai, R., Murakami, Y., Tomiyasu, K., Matsuo, A., and Kindo, K.

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

Fedotovite K$_2$Cu$_3$O(SO$_4$)$_3$ is a candidate of new quantum spin systems, in which the edge-shared tetrahedral (EST) spin-clusters consisting of Cu$^{2+}$ are connected by weak inter-cluster couplings to from one-dimensional array. Comprehensive experimental studies by magnetic susceptibility, magnetization, heat capacity, and inelastic neutron scattering measurements reveal the presence of an effective $S$ = 1 Haldane state below $T \cong 4$ K. Rigorous theoretical studies provide an insight into the magnetic state of K$_2$Cu$_3$O(SO$_4$)$_3$: an EST cluster makes a triplet in the ground state and one-dimensional chain of the EST induces a cluster-based Haldane state. We predict that the cluster-based Haldene state emerges whenever the number of tetrahedra in the EST is $even$.

Published
2017
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26. Magnetic Phase Diagram of Frustrated Spin Ladder

Author

Sugimoto, T., Mori, M., Tohyama, T., and Maekawa, S.

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

Frustrated spin ladders show magnetization plateaux depending on the rung-exchange interaction and frustration defined by the ratio of first and second neighbor exchange interactions in each chain. This paper is the first report on its magnetic phase diagram. Using the variational matrix-product state method, we accurately determine phase boundaries. Several kinds of magnetization plateaux are induced by the frustration and the strong correlation among quasi-particles on a lattice. The appropriate description of quasi-particles and their relevant interactions are changed by a magnetic field. We find that the frustration differentiates the triplet quasi-particle from the singlet one in kinetic energy., Comment: 11 pages, 4 figures

Published
2017
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29. Localized and mixed valence state of Ce $4f$ in superconducting and ferromagnetic CeO$_{1-x}$F$_{x}$BiS$_{2}$ revealed by x-ray absorption and photoemission spectroscopy

Author

Sugimoto, T., Ootsuki, D., Paris, E., Iadecola, A., Salome, M., Schwier, E. F., Iwasawa, H., Shimada, K., Asano, T., Higashinaka, R., Matsuda, T. D., Aoki, Y., Saini, N. L., and Mizokawa, T.

Subjects
Condensed Matter - Superconductivity
Abstract

We have performed Ce $L_3$-edge x-ray absorption spectroscopy (XAS) and Ce $4d$-$4f$ resonant photoemission spectroscopy (PES) on single crystals of CeO$_{1-x}$F$_x$BiS$_2$ for $x=0.0$ and 0.5 in order to investigate the Ce $4f$ electronic states. In the Ce $L_3$-edge XAS, mixed valence of Ce was found in the $x=0.0$ sample and the F-doping suppresses it, which is consistent with the results on polycrystalline samples. As for the resonant PES, we found that the Ce $4f$ electrons in both $x=0.0$ and $0.5$ systems respectively form a flat band at 1.0 eV and 1.4 eV below the Fermi level and there is no contribution to the Fermi surfaces. Interestingly, Ce valence in CeOBiS$_2$ deviates from Ce$^{3+}$ even though Ce $4f$ electrons are localized, indicating the Ce valence is not in a typical valence fluctuation regime. We assume that localized Ce $4f$ in CeOBiS$_2$ is mixed with the unoccupied Bi $6p_z$, which is consistent with the previous local structural study. Based on the analysis of the Ce $L_3$-edge XAS spectra using Anderson's impurity model calculation, we found that the transfer integral becomes smaller increasing the number of Ce $4f$ electrons upon the F substitution for O., Comment: 5 pages, 3 figures

Published
2016
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30. Fermi surfaces and orbital polarization in superconducting CeO$_{0.5}$F$_{0.5}$BiS$_{2}$ revealed by angle-resolved photoemission spectroscopy

Author

Sugimoto, T., Ootsuki, D., Morice, C., Artacho, E., Saxena, S. S., Schwier, E. F., Zheng, M., Kojima, Y., Iwasawa, H., Shimada, K., Arita, M., Namatame, H., Taniguchi, M., Takahashi, M., Saini, N. L., Asano, T., Nakajima, T., Higashinaka, R., Matsuda, T. D., Aoki, Y., and Mizokawa, T.

Subjects
Condensed Matter - Superconductivity
Abstract

We have investigated the electronic structure of BiS$_2$-based CeO$_{0.5}$F$_{0.5}$BiS$_2$ superconductor using polarization-dependent angle-resolved photoemission spectroscopy (ARPES), and succeeded in elucidating the orbital characters on the Fermi surfaces. In the rectangular Fermi pockets around X point, the straight portion parallel to the $k_y$ direction is dominated by Bi $6p_x$ character. The orbital polarization indicates the underlying quasi-one-dimensional electronic structure of the BiS$_2$ system. Moreover, distortions on tetragonally aligned Bi could give rise to the band Jahn-Teller effect., Comment: 5 pages, 4 figures

Published
2015
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31. Electronic structure of Li$_{1+x}$[Mn$_{0.5}$Ni$_{0.5}$]$_{1-x}$O$_2$ studied by photoemission and x-ray absorption spectroscopy

Author

Yokoyama, Y., Ootsuki, D., Sugimoto, T., Wadati, H., Okabayashi, J., Yang, Xu, Du, Fei, Chen, Gang, and Mizokawa, T.

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science
Abstract

We have studied the electronic structure of Li$_{1+x}$[Mn$_{0.5}$Ni$_{0.5}$]$_{1-x}$O$_2$ ($x$ = 0.00 and 0.05), one of the promising cathode materials for Li ion battery, by means of x-ray photoemission and absorption spectroscopy. The results show that the valences of Mn and Ni are basically 4+ and 2+, respectively. However, the Mn$^{3+}$ component in the $x$ = 0.00 sample gradually increases with the bulk sensitivity of the experiment, indicating that the Jahn-Teller active Mn$^{3+}$ ions are introduced in the bulk due to the site exchange between Li and Ni. The Mn$^{3+}$ component gets negligibly small in the $x$ = 0.05 sample, which indicates that the excess Li suppresses the site exchange and removes the Jahn-Teller active Mn$^{3+}$., Comment: 4 pages, 5 figures

Published
2015
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33. Fate of $yz$/$zx$ orbital degeneracy and $xy$ Fermi surface in Ru substituted FeSe$_{1-x}$Te$_{x}$

Author

Sugimoto, T., Ootsuki, D., Sawada, K., Anzai, H., Arita, M., Namatame, H., Taniguchi, M., Horio, M., Horiba, K., Kobayashi, M., Ono, K., Kumigashira, H., Inabe, T., Noji, T., Koike, Y., Saini, N. L., and Mizokawa, T.

Subjects
Condensed Matter - Superconductivity
Abstract

We have investigated the impact of Ru substitution on the multi-band electronic structure of FeSe$_{1-x}$Te$_x$ by means of angle-resolved photoemission spectroscopy (ARPES). The ARPES results exhibit suppression of the $xy$ Fermi surface and the spectral broadening near the zone boundaries, which can be associated with the lattice disorder introduced by the Ru substitution. The degeneracy of the Fe 3$d$ $yz$/$zx$ bands at the zone center, which is broken in FeSe$_{1-x}$Te$_x$, is partly recovered with the Ru substitution, indicating coexistence of nematic and non-nematic electronic states., Comment: 5 pages, 4 figures

Published
2014

34. One-neutron knockout reaction of 17C on a hydrogen target at 70 MeV/nucleon

Author

Satou, Y., Hwang, J. W., Kim, S., Tshoo, K., Choi, S., Nakamura, T., Kondo, Y., Matsui, N., Hashimoto, Y., Nakabayashi, T., Okumura, T., Shinohara, M., Fukuda, N., Sugimoto, T., Otsu, H., Togano, Y., Motobayashi, T., Sakurai, H., Yanagisawa, Y., Aoi, N., Takeuchi, S., Gomi, T., Ishihara, M., Kawai, S., Ong, H. J., Onishi, T. K., Shimoura, S., Tamaki, M., Kobayashi, T., Matsuda, Y., Endo, N., and Kitayama, M.

Subjects
Nuclear Experiment
Abstract

First experimental evidence of the population of the first 2- state in 16C above the neutron threshold is obtained by neutron knockout from 17C on a hydrogen target. The invariant mass method combined with in-beam gamma-ray detection is used to locate the state at 5.45(1) MeV. Comparison of its populating cross section and parallel momentum distribution with a Glauber model calculation utilizing the shell-model spectroscopic factor confirms the core-neutron removal nature of this state. Additionally, a previously known unbound state at 6.11 MeV and a new state at 6.28(2) MeV are observed. The position of the first 2- state, which belongs to a member of the lowest-lying p-sd cross shell transition, is reasonably well described by the shell-model calculation using the WBT interaction., Comment: 15 pages, 3 figures

Published
2013
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35. Te 5p orbitals bring three-dimensional electronic structure to two-dimensional Ir0.95Pt0.05Te2

Author

Ootsuki, D., Toriyama, T., Kobayashi, M., Pyon, S., Kudo, K., Nohara, M., Horiba, K., Ono, K., Kumigashira, H., Noda, T., Sugimoto, T., Fujimori, A., Saini, N. L., Konishi, T., Ohta, Y., and Mizokawa, T.

Subjects
Condensed Matter - Superconductivity
Abstract

We have studied the nature of the three-dimensional multi-band electronic structure in the twodimensional triangular lattice Ir1-xPtxTe2 (x=0.05) superconductor using angle-resolved photoemission spectroscopy (ARPES), x-ray photoemission spectroscopy (XPS) and band structure calculation. ARPES results clearly show a cylindrical (almost two-dimensional) Fermi surface around the zone center. Near the zone boundary, the cylindrical Fermi surface is truncated into several pieces in a complicated manner with strong three-dimensionality. The XPS result and the band structure calculation indicate that the strong Te 5p-Te 5p hybridization between the IrTe2 triangular lattice layers is responsible for the three-dimensionality of the Fermi surfaces and the intervening of the Fermi surfaces observed by ARPES., Comment: 5 pages, 4 figures

Published
2013
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36. Important Roles of Te 5p and Ir 5d Spin-orbit Interactions on the Multi-band Electronic Structure of Triangular Lattice Superconductor Ir1-xPtxTe2

Author

Ootsuki, D., Toriyama, T., Kobayashi, M., Pyon, S., Kudo, K., Nohara, M., Sugimoto, T., Yoshida, T., Horio, M., Fujimori, A., Arita, M., Anzai, H., Namatame, H., Taniguchi, M., Saini, N. L., Konishi, T., Ohta, Y., and Mizokawa, T.

Subjects
Condensed Matter - Superconductivity
Abstract

We report an angle-resolved photoemission spectroscopy (ARPES) study on a triangular lattice superconductor Ir$_{1-x}$Pt$_{x}$Te$_2$ in which the Ir-Ir or Te-Te bond formation, the band Jahn-Teller effect, and the spin-orbit interaction are cooperating and competing with one another. The Fermi surfaces of the substituted system are qualitatively similar to the band structure calculations for the undistorted IrTe$_2$ with an upward chemical potential shift due to electron doping. A combination of the ARPES and the band structure calculations indicates that the Te $5p$ spin-orbit interaction removes the $p_x/p_y$ orbital degeneracy and induces $p_x \pm ip_y$ type spin-orbit coupling near the A point. The inner and outer Fermi surfaces are entangled by the Te $5p$ and Ir $5d$ spin-orbit interactions which may provide exotic superconductivity with singlet-triplet mixing., Comment: 10 pages, 4 figures

Published
2013
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38. 14Be(p,n)14B reaction at 69 MeV in inverse kinematics

Author

Satou, Y., Nakamura, T., Kondo, Y., Matsui, N., Hashimoto, Y., Nakabayashi, T., Okumura, T., Shinohara, M., Fukuda, N., Sugimoto, T., Otsu, H., Togano, Y., Motobayashi, T., Sakurai, H., Yanagisawa, Y., Aoi, N., Takeuchi, S., Gomi, T., Ishihara, M., Kawai, S., Ong, H. J., Onishi, T. K., Shimoura, S., Tamaki, M., Kobayashi, T., Matsuda, Y., Endo, N., and Kitayama, M.

Subjects
Nuclear Experiment
Abstract

A Gamow-Teller (GT) transition from the drip-line nucleus 14Be to 14B was studied via the (p,n) reaction in inverse kinematics using a secondary 14Be beam at 69 MeV/nucleon. The invariant mass method is employed to reconstruct the energy spectrum. A peak is observed at an excitation energy of 1.27(2) MeV in 14B, together with bumps at 2.08 and 4.06(5) MeV. The observed forward peaking of the state at 1.27 MeV and a good description for the differential cross section, obtained with a DWBA calculation provide support for the 1+ assignment to this state. By extrapolating the cross section to zero momentum transfer the GT-transition strength is deduced. The value is found to compare well with that reported in a beta-delayed neutron emission study., Comment: 5 pages, 2 figures

Published
2011
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39. Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics

Author

The ATLAS Collaboration, Aad, G., Abat, E., Abbott, B., Abdallah, J., Abdelalim, A. A., Abdesselam, A., Abdinov, O., Abi, B., Abolins, M., Abramowicz, H., Acharya, B. S., Adams, D. L., Addy, T. N., Adorisio, C., Adragna, P., Adye, T., Aguilar-Saavedra, J. A., Aharrouche, M., Ahlen, S. P., Ahles, F., Ahmad, A., Ahmed, H., Aielli, G., Akdogan, T., Akesson, T. P. A., Akimoto, G., Alam, M. S., Alam, M. A., Albert, J., Albrand, S., Aleksa, M., Aleksandrov, I. N., Alessandria, F., Alexa, C., Alexander, G., Alexandre, G., Alexopoulos, T., Alhroob, M., Alimonti, G., Alison, J., Aliyev, M., Allport, P. P., Allwood-Spiers, S. E., Aloisio, A., Alon, R., Alonso, A., Alonso, J., Alviggi, M. G., Amako, K., Amaral, P., Amelung, C., Ammosov, V. V., Amorim, A., Amoros, G., Amram, N., Anastopoulos, C., Anders, C. F., Anderson, K. J., Andreazza, A., Andrei, V., Andrieux, M-L., Anduaga, X. S., Anghinolfi, F., Antonaki, A., Antonelli, M., Antonelli, S., Antunovic, B., Anulli, F. A., Arabidze, G., Aracena, I., Arai, Y., Arce, A. T. H., Archambault, J. P., Arfaoui, S., Arguin, J-F., Argyropoulos, T., Arik, E., Arik, M., Armbruster, A. J., Arnaez, O., Arnault, C., Artamonov, A., Arutinov, D., Asai, M., Asai, S., Ask, S., Asman, B., Asner, D., Asquith, L., Assamagan, K., Astbury, A., Astvatsatourov, A., Atkinson, T., Atoian, G., Auerbach, B., Auge, E., Augsten, K., Aurousseau, M. A., Austin, N., Avolio, G., Avramidou, R., Axen, A., Ay, C., Azuelos, G., Azuma, Y., Baak, M. A., Baccaglioni, G., Bacci, C., Bachacou, H., Bachas, K., Backes, M., Badescu, E., Bagnaia, P., Bai, Y., Bailey, D. C., Baines, J. T., Baker, O. K., Pedrosa, F. Baltasar Dos Santos, Banas, E., Banerjee, S., Banfi, D., Bangert, A., Bansal, V., Baranov, S. P., Baranov, S., Barashkou, A., Barber, T. B., Barberio, E. L., Barberis, D., Barbero, M. B., Bardin, D. Y., Barillari, T., Barisonzi, M., Barklow, T., Barlow, N. B., Barnett, B. M., Barnett, R. M., Baron, S., Baroncelli, A., Barr, A. J., Barreiro, F., da Costa, J. Barreiro Guimaraes, Barrillon, P., Bartoldus, R., Bartsch, D., Bastos, J., Bates, R. L., Batley, J. R., Battaglia, A., Battistin, M., Bauer, F., Bazalova, M., Beare, B., Beauchemin, P. H., Beccherle, R. B., Becerici, N., Bechtle, P., Beck, G. A., Beck, H. P., Beckingham, M., Becks, K. H., Bedajanek, I., Beddall, A. J., Beddall, A., Bednar, P., Bednyakov, V. A., Bee, C., Harpaz, S. Behar, Behera, P. K., Beimforde, M., Belanger-Champagne, C., Bell, P. J., Bell, W. H., Bella, G., Bellagamba, L., Bellina, F., Bellomo, M., Belloni, A., Belotskiy, K., Beltramello, O., Ami, S. Ben, Benary, O., Benchekroun, D., Bendel, M., Benedict, B. H., Benekos, N., Benhammou, Y., Benincasa, G. P., Benjamin, D. P., Benoit, M., Bensinger, J. R., Benslama, K., Bentvelsen, S., Beretta, M., Berge, D., Kuutmann, E. Bergeaas, Berger, N., Berghaus, F., Berglund, E., Beringer, J., Bernardet, K., Bernat, P., Bernhard, R., Bernius, C., Berry, T., Bertin, A., Besson, N., Bethke, S., Bianchi, R. M., Bianco, M., Biebel, O., Biesiada, J., Biglietti, M., Bilokon, H., Binet, S., Bingul, A., Bini, C., Biscarat, C., Bischofberger, M., Bitenc, U., Black, K. M., Blair, R. E., Blanchot, G., Blocker, C., Blocki, J., Blondel, A., Blum, W., Blumenschein, U., Boaretto, C., Bobbink, G. J., Bocci, A., Bodine, B., Boek, J., Boelaert, N., Boeser, S., Bogaerts, J. A., Bogouch, A., Bohm, C., Bohm, J., Boisvert, V., Bold, T., Boldea, V., Bondarenko, V. G., Bondioli, M., Boonekamp, M., Booth, C. N., Booth, P. S. L., Booth, J. R. A., Borisov, A., Borissov, G., Borjanovic, I., Borroni, S., Bos, K., Boscherini, D., Bosman, M., Bosteels, M., Boterenbrood, H., Bouchami, J., Boudreau, J., Bouhova-Thacker, E. V., Boulahouache, C., Bourdarios, C., Boyd, J., Boyko, I. R., Braem, A., Branchini, P., Brandenburg, G. W., Brandt, A., Brandt, O., Bratzler, U., Brau, J. E., Braun, H. M., Brelier, B., Bremer, J., Brenner, R., Bressler, S., Breton, D., Brett, N. D., Britton, D., Brochu, F. M., Brock, I., Brock, R., Brodet, E., Broggi, F., Brooijmans, G., Brooks, W. K., Brubaker, E., de Renstrom, P. A. Bruckman, Bruncko, D., Bruneliere, R., Brunet, S., Bruni, A., Bruni, G., Bruschi, M., Buanes, T., Bucci, F. B., Buchholz, P., Buckley, A. G., Budagov, I. A., Buescher, V., Bugge, L., Bujor, F., Bulekov, O., Bunse, M., Buran, T., Burckhart, H., Burdin, S., Burke, S., Busato, E., Buszello, C. P., Butin, F., Butler, B., Butler, J. M., Buttar, C. M., Butterworth, J. M., Byatt, T., Urban, S. Cabrera, Caforio, D., Cakir, O., Calafiura, P., Calderini, G., Calkins, R., Caloba, L. P., Caloi, R., Calvet, D., Camarri, P., Cambiaghi, M., Cameron, D., Segura, F. Campabadal, Campana, S., Campanelli, M., Canale, V., Cantero, J., Garrido, M. D. M. Capeans, Caprini, I., Caprini, M., Capua, M., Caputo, R., Caramarcu, C., Cardarelli, R., Carli, T., Carlino, G., Carminati, L., Caron, B., Caron, S., Montero, S. Carron, Carter, A. A., Carter, J. R., Carvalho, J., Casadei, D., Casado, M. P., Cascella, M., Caso, C., Hernadez, A. M. Castaneda, Miranda, E. Castaneda, Gimenez, V. Castillo, Castro, N. F., Cataldi, G., Catinaccio, A., Catmore, J. R., Cattai, A., Cattani, G., Caughron, S., Cauz, D., Cavalleri, P., Cavalli, D., Cavalli-Sforza, M., Cavasinni, V., Cazzato, A., Ceradini, F., Cerqueira, A. S., Cerri, A., Cerrito, L., Cerutti, F., Cetin, S. A., Cevenini, F., Chafaq, A. C., Chakraborty, D., Chapman, J. D., Chapman, J. W., Chareyre, E. C., Charlton, D. G., Chatterjii, S. C., Cheatham, S., Chekanov, S., Chekulaev, S. V., Chelkov, G. A., Chen, H., Chen, T., Chen, X., Cheng, S., Cheng, T. L., Cheplakov, A., Chepurnov, V. F., Moursli, R. Cherkaoui El, Tcherniatine, V., Chesneanu, D., Cheu, E., Cheung, S. L., Chevalier, L., Chevallier, F., Chiarella, V., Chiefari, G., Chikovani, L., Childers, J. T., Chilingarov, A., Chiodini, G., Chouridou, S., Chren, D., Christidi, I. A., Christov, A., Chromek-Burckhart, D., Chu, M. L., Chudoba, J., Ciapetti, G., Ciftci, A. K., Ciftci, R., Cindro, V., Ciobotaru, M. D., Ciocca, C., Ciocio, A., Cirilli, M., Citterio, M., Clark, A., Cleland, W., Clemens, J. C., Clement, B., Clement, C., Clements, D., Coadou, Y., Cobal, M., Coccaro, A., Cochran, J., Coelli, S., Coggeshall, J., Cogneras, E., Cojocaru, C. D., Colas, J., Cole, B., Colijn, A. P., Collard, C., Collins, N. J., Collins-Tooth, C., Collot, J., Colon, G., Coluccia, R., Muino, P. Conde, Coniavitis, E., Consonni, M., Constantinescu, S., Conta, C., Conventi, F., Cook, J., Cooke, M., Cooper, B. D., Cooper-Smith, N. J., Copic, K., Cornelissen, T., Corradi, M., Corriveau, F. C., Corso-Radu, A., Cortes-Gonzalez, A., Costa, G., Costa, M. J., Costanzo, D., Costin, T., Cote, D., Torres, R. Coura, Courneyea, L., Cowan, G., Cowden, C. C., Cox, B. E., Cranmer, K., Cranshaw, J., Cristinziani, M., Crosetti, G., Crupi, R. C., Crepe-Renaudin, S., Cuciuc, C. -M., Almenar, C. Cuenca, Curatolo, M., Curtis, C. J., Cwetanski, P., Czyczula, Z., D'Auria, S., D'Onofrio, M., D'Orazio, A., Mello, A. Da Rocha Gesualdi, Da Silva, P. V. M., Da Via, C. V., Dabrowski, W., Dai, T., Dallapiccola, C., Dallison, S. J., Daly, C. H., Dam, M., Danielsson, H. O., Dannheim, D., Dao, V., Darbo, G., Davey, W. D., Davidek, T., Davidson, N., Davidson, R., Davison, A. R., Dawson, I., Dawson, J. W., Daya, R. K., De, K., de Asmundis, R., De Castro, S., Salgado, P. E. De Castro Faria, De Cecco, S., De Groot, N., de Jong, P., De La Cruz-Burelo, E., De La Taille, C., De Mora, L., Branco, M. De Oliveira, De Pedis, D., De Salvo, A., De Sanctis, U., De Santo, A., De Regie, J. B. De Vivie, De Zorzi, G., Dean, S., Dedes, G., Dedovich, D. V., Defay, P. O., Degenhardt, J., Dehchar, M., Del Papa, C., Del Peso, J., Del Prete, T., Dell'Acqua, A., Dell'Asta, L., Della Pietra, M., della Volpe, D., Delmastro, M., Delruelle, N., Delsart, P. A., Demers, S., Demichev, M., Demirkoz, B., Deng, W., Denisov, S. P., Dennis, C., Derue, F., Dervan, P., Desch, K. K., Deviveiros, P. O., Dewhurst, A., Dhullipudi, R., Di Ciaccio, A., Di Ciaccio, L., Di Domenico, A., Di Girolamo, A., Di Girolamo, B., Di Luise, S., Di Mattia, A., Di Nardo, R., Di Simone, A., Di Sipio, R., Diaz, M. A., Diehl, E. B., Dietrich, J., Diglio, S., Yagci, K. Dindar, Dingfelder, D. J., Dionisi, C., Dita, P., Dita, S., Dittus, F., Djama, F., Djilkibaev, R., Djobava, T., Vale, M. A. B. do, Dobbs, M., Dobinson, R., Dobos, D., Dobson, E., Dobson, M., Dogan, O. B., Doherty, T., Doi, Y., Dolejsi, J., Dolenc, I., Dolezal, Z., Dolgoshein, B. A., Donega, M., Donini, J., Donszelmann, T., Dopke, J., Dorfan, D. E., Doria, A., Anjos, A. Dos, Dosil, M., Dotti, A., Dova, M. 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Valls, Van der Bij, H., van der Graaf, H., van der Kraaij, E., van der Poel, E., van Eldik, N., van Gemmeren, P., van Kesteren, Z., van Vulpen, I., VanBerg, R., Vandelli, W., Vandoni, G., Vaniachine, A., Vankov, P., Vannucci, F., Rodriguez, F. Varela, Vari, R., Varnes, E. W., Varouchas, D., Vartapetian, A., Varvell, K. E., Vassilakopoulos, V. I., Vassilieva, L., Vataga, E., Vazeille, F., Vegni, G., Veillet, J. J., Vellidis, C., Veloso, F., Veness, R., Veneziano, S., Ventura, A., Ventura, D., Ventura, S., Venturi, N., Vercesi, V., Verducci, M., Verkerke, W., Vermeulen, J. C., Vetterli, M. C., Vichou, I., Vickey, T., Viehhauser, G. H. A., Villa, M., Villani, E. G., Perez, M. Villaplana, Vilucchi, E., Vincter, M. G., Vinogradov, V. B., Virchaux, M., Viret, S., Virzi, J., Vitale, A., Vitells, O. V., Vivarelli, I., Vives, R., Vaques, F. 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J., Wiedenmann, W., Wielers, M., Wienemann, P., Wiglesworth, C., Wildauer, A., Wildt, M. A., Wilhelm, I., Wilkens, H. G., Williams, H. H., Willis, W., Willocq, S., Wilson, J. A., Wilson, M. G., Wilson, A., Wingerter-Seez, I., Winklmeier, F. W., Winton, L., Wittgen, M., Wolter, M. W., Wolters, H., Wosiek, B., Wotschack, J., Woudstra, M. J., Wraight, K., Wright, C., Wrona, B., Wu, S. L., Wu, X., Xella, S., Xie, S., Xie, Y., Xu, G., Xu, N., Yamamoto, A., Yamamoto, S., Yamamura, T., Yamanaka, K., Yamazaki, T., Yamazaki, Y., Yan, Z., Yang, H., Yang, U. K., Yang, Y., Yang, Z., Yao, W-M., Yao, Y., Yasu, Y., Ye, J., Ye, S., Yilmaz, M., Yoosoofmiya, R., Yorita, K., Yoshida, R., Young, C., Youssef, S. P., Yu, D., Yu, J., Yu, M., Yu, X., Yuan, J., Yuan, L., Yurkewicz, A., Zaidan, R., Zaitsev, A. M., Zajacova, Z., Zanello, L., Zarzhitsky, P., Zaytsev, A., Zdrazil, M., Zeitnitz, C., Zeller, M., Zema, P. F., Zendler, C., Zenin, A. V., Zenis, T., Zenonos, Z., Zenz, S., Zerwas, D., Zhan, Z., Zhang, H., Zhang, J., Zhang, Q., Zheng, W., Zhang, X., Zhao, L., Zhao, T., Zhao, Z., Zhelezko, A., Zhemchugov, A., Zheng, S., Zhong, J., Zhou, B., Zhou, N., Zhou, S., Zhou, Y., Zhu, C. G., Zhu, H., Zhu, Y., Zhuang, X. A., Zhuravlov, V., Zilka, B., Zimmermann, R., Zimmermann, S., Zinna, M., Ziolkowski, M., Zitoun, R., Zivkovic, L., Zmouchko, V. V., Zobernig, G., Zoccoli, A., Nedden, M. zur, and Zychacek, V.

Subjects
High Energy Physics - Experiment
Abstract

A detailed study is presented of the expected performance of the ATLAS detector. The reconstruction of tracks, leptons, photons, missing energy and jets is investigated, together with the performance of b-tagging and the trigger. The physics potential for a variety of interesting physics processes, within the Standard Model and beyond, is examined. The study comprises a series of notes based on simulations of the detector and physics processes, with particular emphasis given to the data expected from the first years of operation of the LHC at CERN.

Published
2008

40. Ground-state electric quadrupole moment of 31Al

Author

Nagae, D., Ueno, H., Kameda, D., Takemura, M., Asahi, K., Takase, K., Yoshimi, A., Sugimoto, T., Shimada, K., Nagatomo, T., Uchida, M., Arai, T., Inoue, T., Kagami, S., Hatakeyama, N., Kawamura, H., Narita, K., and Murata, J.

Subjects
Nuclear Experiment
Abstract

Ground-state electric quadrupole moment of 31Al (I =5/2+, T_1/2 = 644(25) ms) has been measured by means of the beta-NMR spectroscopy using a spin-polarized 31Al beam produced in the projectile fragmentation reaction. The obtained Q moment, |Q_exp(31Al)| = 112(32)emb, are in agreement with conventional shell model calculations within the sd valence space. Previous result on the magnetic moment also supports the validity of the sd model in this isotope, and thus it is concluded that 31Al is located outside of the island of inversion., Comment: 5 pages

Published
2008
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41. Unbound excited states in 19,17C

Author

Satou, Y., Nakamura, T., Fukuda, N., Sugimoto, T., Kondo, Y., Matsui, N., Hashimoto, Y., Nakabayashi, T., Okumura, T., Shinohara, M., Motobayashi, T., Yanagisawa, Y., Aoi, N., Takeuchi, S., Gomi, T., Togano, Y., Kawai, S., Sakurai, H., Ong, H. J., Onishi, T. K., Shimoura, S., Tamaki, M., Kobayashi, T., Otsu, H., Matsuda, Y., Endo, N., Kitayama, M., and Ishihara, M.

Subjects
Nuclear Experiment
Abstract

The neutron-rich carbon isotopes 19,17C have been investigated via proton inelastic scattering on a liquid hydrogen target at 70 MeV/nucleon. The invariant mass method in inverse kinematics was employed to reconstruct the energy spectrum, in which fast neutrons and charged fragments were detected in coincidence using a neutron hodoscope and a dipole magnet system. A peak has been observed with an excitation energy of 1.46(10) MeV in 19C, while three peaks with energies of 2.20(3), 3.05(3), and 6.13(9) MeV have been observed in 17C. Deduced cross sections are compared with microscopic DWBA calculations based on p-sd shell model wave functions and modern nucleon-nucleus optical potentials. Jpi assignments are made for the four observed states as well as the ground states of both nuclei., Comment: 20 pages

Published
2007
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42. Observations and asteroseismic analysis of the rapidly pulsating hot B subdwarf PG 0911+456

Author

Randall, S. K., Green, E. M., Van Grootel, V., Fontaine, G., Charpinet, S., Lesser, M., Brassard, P., Sugimoto, T., Chayer, P., Fay, A., Wroblewski, P., Daniel, M., Story, S., and Fitzgerald, T.

Subjects
Astrophysics
Abstract

The principal aim of this project is to determine the structural parameters of the rapidly pulsating subdwarf B star PG 0911+456 from asteroseismology. Our work forms part of an ongoing programme to constrain the internal characteristics of hot B subdwarfs with the long-term goal of differentiating between the various formation scenarios proposed for these objects. First comparisons of asteroseismic values with evolutionary theory look promising, however it is clear that more targets are needed for meaningful statistics to be derived. The observational pulsation periods of PG 0911+456 were extracted from rapid time-series photometry using standard Fourier analysis techniques. Supplemented by spectroscopic estimates of the star's mean atmospheric parameters, they were used as a basis for the "forward modelling" approach in asteroseismology. The latter culminates in the identification of one or more "optimal" models that can accurately reproduce the observed period spectrum. This naturally leads to an identification of the oscillations detected in terms of degree l and radial order k, and infers the structural parameters of the target. From the photometry it was possible to extract 7 independent pulsation periods in the 150-200 s range with amplitudes between 0.05 and 0.8 % of the star's mean brightness. An asteroseismic search of parameter space identified several models that matched the observed properties of PG 0911+456 well, one of which was isolated as the "optimal" model on the basis of spectroscopic and mode identification considerations. All the observed pulsations are identified with low-order acoustic modes with degree indices l=0,1,2 and 4, and match the computed periods with a dispersion of only ~0.26 %., Comment: accepted for publication in A&A, 14 pages, 13 figures

Published
2007
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43. A search for deeply bound kaonic nuclear states

Author

Suzuki, T., Bhang, H., Franklin, G., Gomikawa, K., Hayano, R. S., Hayashi, T., Ishikawa, K., Ishimoto, S., Itahashi, K., Iwasaki, M., Katayama, T., Kondo, Y., Matsuda, Y., Nakamura, T., Okada, S., Outa, H., Quinn, B., Sato, M., Shindo, M., So, H., Sugimoto, T., Strasser, P., Suzuki, K., Suzuki, S., Tomono, D., Vinodkumar, A. M., Widmann, E., Yamazaki, T., and Yoneyama, T.

Subjects
Nuclear Experiment
Abstract

We have measured proton and neutron energy spectra by stopping negative kaons on liquid helium4. Two distinct peak structures were found on both spectra, which were assigned to the formation of new kinds of strange stribaryons. In this paper, we summarize both results., Comment: 7 pages, 3 figures, HYP2003 conference proceedings

Published
2005
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44. Indication of a strange tribaryon S^+ from the ^4He(stopped K^-,n) reaction

Author

Iwasaki, M., Suzuki, T., Bhang, H., Franklin, G., Gomikawa, K., Hayano, R. S., Hayashi, T., Ishikawa, K., Ishimoto, S., Itahashi, K., Katayama, T., Kondo, Y., Matsuda, Y., Nakamura, T., Okada, S., Outa, H., Quinn, B., Sato, M., Shindo, M., So, H., Sugimoto, T., Strasser, P., Suzuki, K., Suzuki, S., Tomono, D., Vinodkumar, A. M., Widmann, E., Yamazaki, T., and Yoneyama, T.

Subjects
Nuclear Experiment
Abstract

We measured the neutron time-of-flight spectrum in the ^4He(stopped K^-, n) reaction by stopping negative kaons in a superfluid helium target. A clear enhancement was observed in the neutron spectrum, which indicates the formation of a strange tribaryon of charge +1 with a mass and width of M = 3141 +/- 3 (stat.) +4/-1 (sys.) MeV/c^2 and G < 23 MeV/c^2. This state, denoted as S^+(3140), is about 25 MeV/c^2 higher than the previously observed S^0(3115) T=1., Comment: 13 pages, 7 figures, updated because of new reslut found in PLB597(2004)263

Published
2003

45. Anomalously hindered E2 strength B(E2;2_1^+ -> 0^+) in 16C

Author

Imai, N., Aoi, N., Fukuda, N., Kishida, T., Kubo, T., Minemura, T., Motobayashi, T., Takeuchi, S., Yoneda, K., Watanabe, H., Ishihara, M., Ong, H. J., Sakurai, H., Iwasaki, H., Ohnishi, T. K., Suzuki, M. K., Demichi, K., Kawasaki, H., Baba, H., Gomi, T., Hasegawa, H., Kaneko, E., Kanno, S., Kurita, K., Takeshita, E., Saito, A., Dombradi, Zs., Elekes, Z., Fulop, Zs., Gelberg, A., Ishikawa, K., Kondo, Y., Miura, M., Nakamura, T., Sugimoto, T., Michimasa, S., Notani, M., Shimoura, S., and Tamaki, M.

Subjects
Nuclear Experiment
Abstract

The electric quadrupole transition from the first 2+ state to the ground 0+ state in 16C is studied through measurement of the lifetime by a recoil shadow method applied to inelastically scattered radioactive 16C nuclei. The measured lifetime is 75 +- 23 ps, corresponding to a B(E2;2_1+ -> 0^+) value of 0.63 +- 0.19 e2fm4, or 0.26 +- 0.08 Weisskopf units. The transition strength is found to be anomalously small compared to the empirically predicted value., Comment: 4pages, 4figures, submitted to Physical Review Letters

Published
2003
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