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51. The major upgrade of the MAGIC telescopes, Part I: The hardware improvements and the commissioning of the system

Author: R. Zanin, Adrian Biland, I. Lozano, J. Rico, Masahiro Teshima, W. Idec, Takashi Saito, J. Krause, B. De Lotto, Nikola Godinovic, Benito Marcote, Stefano Ansoldi, I. Snidaric, David Fink, K. Mallot, R. J. García López, D. Corti, Alessandro Carosi, Mosè Mariotti, A.-K. Overkemping, J. M. Illa, Riccardo Paoletti, Massimo Persic, Gianluca Giavitto, A. González Muñoz, Reiko Orito, P. Temnikov, M. Palatiello, J. Becerra González, Marcel Strzys, Dario Hrupec, M. Bitossi, Ruben Lopez-Coto, Jose Luis Lemus, D. Nakajima, Elina Lindfors, E. Lorenz, Abelardo Moralejo, Saverio Lombardi, A. Treves, Vitaly Neustroev, M. Makariev, Thomas Bretz, Daniel Mazin, Jose Miguel Miranda, M. A. Lopez, S. Rügamer, Juan Abel Barrio, S. Schmidl, T. Steinbring, Francesco Dazzi, J. M. Paredes, Antonio Stamerra, C. Delgado Mendez, G. Maneva, Stefano Covino, B. Biasuzzi, A. Dettlaff, M. Hayashida, D. Hildebrand, Francesco Longo, G. De Caneva, D. Fidalgo, Daniela Dorner, Jose Luis Contreras, Wolfgang Rhode, M. I. Martínez, Marc Ribó, S. Bonnefoy, K. Saito, Natalia Lewandowska, Patrick Vogler, E. Colombo, M. Gaug, Juan Cortina, D. Tescaro, Roberto Cecchi, P. Bangale, H. Wetteskind, A. La Barbera, A. Deangelis, J. Herrera, Hidetoshi Kubo, Sabrina Einecke, S. R. Gozzini, Luis Ángel Tejedor, M. V. Fonseca, Hanna Kellermann, Koji Noda, Louis Antonelli, G. Bonnoli, J. Rodriguez Garcia, Elisa Bernardini, X. Paredes-Fortuny, J. Hose, U. Menzel, K. Kodani, J. Storz, Yusuke Konno, Christian Fruck, A. Sillanpää, D. Elsaesser, L. O. Takalo, F. Borracci, W. Haberer, H. Takami, Oscar Blanch, K. Frantzen, P. G. Prada Moroni, Diego F. Torres, W. Bednarek, Fabrizio Tavecchio, V. Kadenius, S. Paiano, Ll. Font, D. Garrido Terrats, A. Lorca, Karl Mannheim, O. Tibolla, Alicia López-Oramas, T. Schweizer, Felix Spanier, R. Mirzoyan, P. Munar-Adrover, D. Eisenacher, V. Scalzotto, Markus Garczarczyk, N. Mankuzhiyil, Juri Poutanen, Kyoshi Nishijima, D. Dominis Prester, Y. Hanabata, C. Schultz, V. Scapin, P. Antoranz, M. L. Knoetig, Ana Babić, Julia Thaele, E. Carmona, Kari Nilsson, M. Will, L. Maraschi, E. Prandini, Tomislav Terzić, R. Reinthal, M. Negrello, Damir Lelas, Dorota Sobczyńska, Ivica Puljak, Pierre Colin, E. de Oña Wilhelmi, Jelena Aleksić, A. Niedzwiecki, David Paneque, M. Barcelo, D. Galindo, Konstancja Satalecka, Michele Doro, Julian Sitarek, Daniela Hadasch, T. Toyama, Junko Kushida, P. Da Vela, J. Schlammer, Universitat de Barcelona, Aleksić, J, Ansoldi, S., Antonelli, L. A., Antoranz, P., Babic, A., Bangale, P., Barceló, M., Barrio, J. A., Becerra González, J., Bednarek, W., Bernardini, E., Biasuzzi, B., Biland, A., Bitossi, M., Blanch, O., Bonnefoy, S., Bonnoli, G., Borracci, F., Bretz, T., Carmona, E., Carosi, A., Cecchi, R., Colin, P., Colombo, E., Contreras, J. L., Corti, D., Cortina, J., Covino, S., Da Vela, P., Dazzi, F., Deangelis, A., De Caneva, G., De Lotto, B., De Oña Wilhelmi, E., Delgado Mendez, C., Dettlaff, A., Dominis Prester, D., Dorner, D., Doro, M., Einecke, S., Eisenacher, D., Elsaesser, D., Fidalgo, D., Fink, D., Fonseca, M. V., Font, L., Frantzen, K., Fruck, C., Galindo, D., García López, R. J., Garczarczyk, M., Garrido Terrats, D., Gaug, M., Giavitto, G., Godinović, N., González Muñoz, A., Gozzini, S. R., Haberer, W., Hadasch, D., Hanabata, Y., Hayashida, M., Herrera, J., Hildebrand, D., Hose, J., Hrupec, D., Idec, W., Illa, J. M., Kadenius, V., Kellermann, H., Knoetig, M. L., Kodani, K., Konno, Y., Krause, J., Kubo, H., Kushida, J., La Barbera, A., Lelas, D., Lemus, J. L., Lewandowska, N., Lindfors, E., Lombardi, S., Longo, Francesco, López, M., López Coto, R., López Oramas, A., Lorca, A., Lorenz, E., Lozano, I., Makariev, M., Mallot, K., Maneva, G., Mankuzhiyil, N., Mannheim, K., Maraschi, L., Marcote, B., Mariotti, M., Martínez, M., Mazin, D., Menzel, U., Miranda, J. M., Mirzoyan, R., Moralejo, A., Munar Adrover, P., Nakajima, D., Negrello, M., Neustroev, V., Niedzwiecki, A., Nilsson, K., Nishijima, K., Noda, K., Orito, R., Overkemping, A., Paiano, S., Palatiello, Michele, Paneque, D., Paoletti, R., Paredes, J. M., Paredes Fortuny, X., Persic, M., Poutanen, J., Prada Moroni, P. G., Prandini, E., Puljak, I., Reinthal, R., Rhode, W., Ribó, M., Rico, J., Rodriguez Garcia, J., Rügamer, S., Saito, T., Saito, K., Satalecka, K., Scalzotto, V., Scapin, V., Schultz, C., Schlammer, J., Schmidl, S., Schweizer, T., Sillanpää, A., Sitarek, J., Snidaric, I., Sobczynska, D., Spanier, F., Stamerra, A., Steinbring, T., Storz, J., Strzys, M., Takalo, L., Takami, H., Tavecchio, F., Tejedor, L. A., Temnikov, P., Terzić, T., Tescaro, D., Teshima, M., Thaele, J., Tibolla, O., Torres, D. F., Toyama, T., Treves, A., Vogler, P., Wetteskind, H., Will, M., and Zanin, R.
Subjects: Astrofísica, Physics::Instrumentation and Detectors, MAGIC, Imaging Atmospheric Cherenkov Telescopes, Instruments, TeV astrophysics, Very High Energy Gamma Rays, Stereoscopy, Astrophysics, 01 natural sciences, law.invention, Raigs gamma, law, Overall performance, MAGIC (telescope), TeV, astrophysics, CRAB-NEBULA, PERFORMANCE, STEREO, 010303 astronomy & astrophysics, Physics, Astrophysics::Instrumentation and Methods for Astrophysics, Instrument, Upgrade, ddc:540, Electrónica, Física nuclear, Astrophysics::Earth and Planetary Astrophysics, Electricidad, Astrophysics - Instrumentation and Methods for Astrophysics, TeV astrophysic, Noise (radio), Computer hardware, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astronomy and Astrophysics, Telescope, 0103 physical sciences, Very High Energy Gamma Ray, Instrumentation and Methods for Astrophysics (astro-ph.IM), Cherenkov radiation, ta115, Telescopis, 010308 nuclear & particles physics, business.industry, Gamma rays, Cherenkov Telescope Array, Imaging Atmospheric Cherenkov Telescope, business, astro-ph.IM, Telescopes
Abstract: The MAGIC telescopes are two Imaging Atmospheric Cherenkov Telescopes (IACTs) located on the Canary island of La Palma. The telescopes are designed to measure Cherenkov light from air showers initiated by gamma rays in the energy regime from around 50 GeV to more than 50 TeV. The two telescopes were built in 2004 and 2009, respectively, with different cameras, triggers and readout systems. In the years 2011-2012 the MAGIC collaboration undertook a major upgrade to make the stereoscopic system uniform, improving its overall performance and easing its maintenance. In particular, the camera, the receivers and the trigger of the first telescope were replaced and the readout of the two telescopes was upgraded. This paper (Part I) describes the details of the upgrade as well as the basic performance parameters of MAGIC such as raw data treatment, dead time of the system, linearity in the electronic chain and sources of noise. In Part II, we describe the physics performance of the upgraded system., 19 pages, 18 figures, accepted by Astroparticle Physics
Published: 2016
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52. Long-term multi-wavelength variability and correlation study of Markarian 421 from 2007 to 2009

Author: E. Moretti, Alessandro Carosi, D. Nakajima, Kyoshi Nishijima, Arka Chatterjee, C. M. Raiteri, Nikola Godinovic, Benito Marcote, D. Fidalgo, Jose Miguel Miranda, D. Dominis Prester, Yusuke Konno, B. Jordan, Aaron Dominguez, L. Perri, Elena G. Larionova, Marina Manganaro, Kari Nilsson, Pratik Majumdar, M. V. Fonseca, Wen Ping Chen, M. Will, A. La Barbera, D. Galindo, R. Zanin, Merja Tornikoski, Mosè Mariotti, Dario Hrupec, K. Kodani, S. N. Shore, Louis Antonelli, D. Eisenacher Glawion, Max Ludwig Ahnen, X. Paredes-Fortuny, M. Nievas Rosillo, J. E. Ward, A. González Muñoz, Adrian Biland, A.-K. Overkemping, Razmik Mirzoyan, U. Barres de Almeida, J. Palacio, Dmitry A. Blinov, G. Pedaletti, M. A. Lopez, Juri Poutanen, Konstancja Satalecka, Sofia O. Kurtanidze, Michele Doro, U. Menzel, J. M. Paredes, S. Bonnefoy, Givi N. Kimeridze, Thomas Bretz, E. N. Kopatskaya, M. H. Wu, Antonio Stamerra, K. Frantzen, J. Rico, M. Villata, P. Giammaria, Damir Lelas, Alexander Hahn, Y. Hanabata, E. Forné, F. Di Pierro, Jose Luis Contreras, H. C. Lin, R. López-Coto, I. Snidaric, Daniela Dorner, Dariusz Gora, A. Niedzwiecki, F. Borracci, Gareth Hughes, P. Antoranz, Juan Abel Barrio, Juan Cortina, Saverio Lombardi, L. V. Larionova, Ivan S. Troitsky, David Paneque, Dorota Sobczyńska, P. Temnikov, S. Paiano, Karl Mannheim, B. Biasuzzi, M. Gaug, J. Herrera, Talvikki Hovatta, Junko Kushida, Diego F. Torres, Wolfgang Rhode, D. Guberman, Koji Noda, Elisa Bernardini, M. G. Nikolashvili, P. Da Vela, Francesco Longo, J. Hose, D. Garrido Terrats, J. Becerra González, E. Prandini, A. De Angelis, A. Treves, D. Elsaesser, Vitaly Neustroev, D. Hadasch, Julia Thaele, P. G. Prada Moroni, R. Clavero, Markus Garczarczyk, Valeri M. Larionov, R. Ligustri, H. Takami, W. Bednarek, Julian Sitarek, Fabrizio Tavecchio, J. A. Ros, Abelardo Moralejo, M. Palatiello, Stefano Ansoldi, A. C. Sadun, C. Schultz, Vassil Verguilov, G. Maneva, B. Banerjee, S. Buson, Riccardo Paoletti, T. Steinbring, C. Fruck, Lorand A. Sigua, W. Idec, Ivica Puljak, Francesco Dazzi, A. Fernández-Barral, Pierre Colin, Oscar Blanch, T. S. Grishina, Ana Babić, E. de Oña Wilhelmi, E. Colombo, T. Toyama, O. M. Kurtanidze, G. Bonnoli, Elina Lindfors, Anne Lähteenmäki, M. Hayashida, D. A. Morozova, L. O. Takalo, Masahiro Teshima, Ekaterina Koptelova, A. Sillanpää, B. De Lotto, Ievgen Vovk, L. Maraschi, Tomislav Terzić, T. Schweizer, Reiko Orito, Daniel Mazin, Marc Ribó, P. Bangale, Hidetoshi Kubo, Stefano Covino, Tomoki Saito, D. Tescaro, M. Makariev, B. McBreen, M. I. Martínez, Sabrina Einecke, J. Rodriguez Garcia, K. Mallot, R. J. García López, Massimo Persic, Lluis Font, Marcel Strzys, N. V. Efimova, L. Nogués, Universitat de Barcelona, Ahnen, M. L., Ansoldi, S., Antonelli, L. A., Antoranz, P., Babic, A., Banerjee, B., Bangale, P., Barres De Almeida, U., Barrio, J. A., Becerra González, J., Bednarek, W., Bernardini, E., Biasuzzi, B., Biland, A., Blanch, O., Bonnefoy, S., Bonnoli, G., Borracci, F., Bretz, T., Buson, S., Carosi, A., Chatterjee, A., Clavero, R., Colin, P., Colombo, E., Contreras, J. L., Cortina, J., Covino, S., Da Vela, P., Dazzi, F., De Angelis, A., De Lotto, B., De Oña Wilhelmi, E., Di Pierro, F., Domínguez, A., Dominis Prester, D., Dorner, D., Doro, M., Einecke, S., Eisenacher Glawion, D., Elsaesser, D., Fernández Barral, A., Fidalgo, D., Fonseca, M. V., Font, L., Frantzen, K., Fruck, C., Galindo, D., García López, R. J., Garczarczyk, M., Garrido Terrats, D., Gaug, M., Giammaria, P., Godinović, N., González Muñoz, A., Gora, D., Guberman, D., Hadasch, D., Hahn, A., Hanabata, Y., Hayashida, M., Herrera, J., Hose, J., Hrupec, D., Hughes, G., Idec, W., Kodani, K., Konno, Y., Kubo, H., Kushida, J., La Barbera, A., Lelas, D., Lindfors, E., Lombardi, S., Longo, Francesco, López, M., López Coto, R., Majumdar, P., Makariev, M., Mallot, K., Maneva, G., Manganaro, M., Mannheim, K., Maraschi, L., Marcote, B., Mariotti, M., Martínez, M., Mazin, D., Menzel, U., Miranda, J. M., Mirzoyan, R., Moralejo, A., Moretti, E., Nakajima, D., Neustroev, V., Niedzwiecki, A., Nievas Rosillo, M., Nilsson, K., Nishijima, K., Noda, K., Nogués, L., Orito, R., Overkemping, A, Paiano, S., Palacio, J., Palatiello, Michele, Paneque, D., Paoletti, R., Paredes, J. M., Paredes Fortuny, X., Pedaletti, G., Perri, L., Persic, M., Poutanen, J., Prada Moroni, P. G., Prandini, E., Puljak, I., Rhode, W., Ribó, M., Rico, J., Rodriguez Garcia, J., Saito, T., Satalecka, K., Schultz, C., Schweizer, T., Shore, S. N., Sillanpää, A., Sitarek, J., Snidaric, I., Sobczynska, D., Stamerra, A., Steinbring, T., Strzys, M., Takalo, L., Takami, H., Tavecchio, F., Temnikov, P., Terzić, T., Tescaro, D., Teshima, M., Thaele, J., Torres, D. F., Toyama, T., Treves, A., Verguilov, V., Vovk, I., Ward, J. E., Will, M., Wu, M. H., Zanin, R., Blinov, D. A., Chen, W. P., Efimova, N. V., Forné, E., Grishina, T. S., Hovatta, T., Jordan, B., Kimeridze, G. N., Kopatskaya, E. N., Koptelova, E., Kurtanidze, O. M., Kurtanidze, S. O., Lähteenmäki, A., Larionov, V. M., Larionova, E. G., Larionova, L. V., Ligustri, R., Lin, H. C., Mcbreen, B., Morozova, D. A., Nikolashvili, M. G., Raiteri, C. M., Ros, J. A., Sadun, A. C., Sigua, L. A., Tornikoski, M., Troitsky, I. S., Villata, M., Department of Radio Science and Engineering, Aalto-yliopisto, and Aalto University
Subjects: Astrofísica, Astroparticle physics, BL Lacertae objects: individual: Markarian 421, Radiation mechanisms: non-thermal, Astronomy and Astrophysics, Space and Planetary Science, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Flux, Astrophysics, Astroparticle physic, individual: Markarian 421 [BL Lacertae objects], 01 natural sciences, Radiació, law.invention, Telescope, law, 0103 physical sciences, MAGIC (telescope), Blazar, 010303 astronomy & astrophysics, Cherenkov radiation, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, non-thermal [Radiation mechanisms], Radiation, 010308 nuclear & particles physics, Compton scattering, Astronomy and Astrophysic, Light curve, Astrophysics - Astrophysics of Galaxies, astroparticle physics / BL Lacertae objects: individual: Markarian 421 / radiation mechanisms: non-thermal, Astrophysics of Galaxies (astro-ph.GA), ddc:520, Electrónica, Física nuclear, Electricidad, Astrophysics - High Energy Astrophysical Phenomena
Abstract: We study the multi-band variability and correlations of the TeV blazar Mrk 421 on year time scales, which can bring additional insight on the processes responsible for its broadband emission. We observed Mrk 421 in the very high energy (VHE) gamma-ray range with the Cherenkov telescope MAGIC-I from March 2007 to June 2009 for a total of 96 hours of effective time after quality cuts. The VHE flux variability is quantified with several methods, including the Bayesian Block algorithm, which is applied to data from Cherenkov telescopes for the first time. The 2.3 year long MAGIC light curve is complemented with data from the Swift/BAT and RXTE/ASM satellites and the KVA, GASP-WEBT, OVRO, and Mets\"ahovi telescopes from February 2007 to July 2009, allowing for an excellent characterisation of the multi-band variability and correlations over year time scales. Mrk 421 was found in different gamma-ray emission states during the 2.3 year long observation period. Flares and different levels of variability in the gamma-ray light curve could be identified with the Bayesian Block algorithm. The same behaviour of a quiet and active emission was found in the X-ray light curves measured by Swift/BAT and the RXTE/ASM, with a direct correlation in time. The behaviour of the optical light curve of GASP-WEBT and the radio light curves by OVRO and Mets\"ahovi are different as they show no coincident features with the higher energetic light curves and a less variable emission. The fractional variability is overall increasing with energy. The comparable variability in the X-ray and VHE bands and their direct correlation during both high- and low-activity periods spanning many months show that the electron populations radiating the X-ray and gamma-ray photons are either the same, as expected in the Synchrotron-Self-Compton mechanism, or at least strongly correlated, as expected in electromagnetic cascades., Comment: Corresponding authors: Ann-Kristin Overkemping (ann-kristin.overkemping@tu-dortmund.de), Marina Manganaro (manganaro@iac.es), Diego Tescaro (diego.tescaro@gmail.com), To be published in Astronomy&Astrophysics (A&A), 12 pages, 9 figures
Published: 2016
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53. Multiwavelength observations of the blazar 1ES 1011+496 in Spring 2008

Author: Pierre Colin, E. de Oña Wilhelmi, Kari Nilsson, L. Maraschi, M. Will, Francesco Longo, Tomislav Terzić, Daniela Dorner, C. Pittori, Michael T. Carini, R. Clavero, Louis Antonelli, E. Prandini, Pratik Majumdar, M. V. Fonseca, Mosè Mariotti, K. Kodani, J. Becerra González, W. Bednarek, M. Makariev, M. Palatiello, Ievgen Vovk, Fabrizio Tavecchio, S. N. Shore, M. Gaug, J. Herrera, J. Palacio, J. M. Paredes, Koji Noda, F. Di Pierro, Antonio Stamerra, Thomas Bretz, Elisa Bernardini, Stefano Covino, T. Schweizer, R. Zanin, D. Dominis Prester, A.-K. Overkemping, Adrian Biland, B. Biasuzzi, R. López-Coto, Juri Poutanen, Nikola Godinovic, R. Reinthal, Benito Marcote, Jose Luis Contreras, Saverio Lombardi, S. Rügamer, Marcel Strzys, R. Walters, Junko Kushida, D. Nakajima, Francesco Dazzi, Juan Abel Barrio, A. Niedzwiecki, P. Da Vela, Juan Cortina, Y. Hanabata, S. Bonnefoy, J. Rico, A. González Muñoz, Razmik Mirzoyan, Oscar Blanch, U. Barres de Almeida, P. Antoranz, Tomoki Saito, D. Tescaro, K. Frantzen, P. Temnikov, E. Colombo, Damir Lelas, K. Mallot, David Paneque, J. Sainio, Arka Chatterjee, M. Hayashida, R. J. García López, L. O. Takalo, Kyoshi Nishijima, Wolfgang Rhode, M. H. Wu, D. Guberman, Dorota Sobczyńska, D. Fidalgo, Gareth Hughes, E. Carmona, Markus Garczarczyk, P. G. Prada Moroni, Anne Lähteenmäki, A. De Angelis, Andrei Berdyugin, A. Pease, S. Paiano, Masahiro Teshima, A. Treves, Vitaly Neustroev, D. Garrido Terrats, G. De Caneva, Alba Fernández-Barral, Stefano Ansoldi, Karl Mannheim, Elina Lindfors, M. I. Martínez, Julian Sitarek, Julia Thaele, Riccardo Paoletti, W. Idec, Massimo Persic, C. Schultz, V. Scapin, Yusuke Konno, F. Lucarelli, Daniel Mazin, Marina Manganaro, Marc Ribó, G. Maneva, T. Toyama, S. Vercellone, D. Galindo, Merja Tornikoski, J. E. Ward, Alicia López-Oramas, Ana Babić, Sabrina Einecke, P. Bangale, Reiko Orito, J. Rodriguez Garcia, Christian Fruck, Hidetoshi Kubo, B. De Lotto, A. La Barbera, Konstancja Satalecka, Michele Doro, X. Paredes-Fortuny, J. Hose, D. Elsaesser, M. Nievas Rosillo, H. Takami, B. Banerjee, D. Glawion, Vassil Verguilov, U. Menzel, Diego F. Torres, M. Pasanen, Abelardo Moralejo, A. Sillanpää, T. Steinbring, Ll. Font, I. Snidaric, E. Lorenz, Max Ludwig Ahnen, P. Giammaria, G. Bonnoli, Dario Hrupec, M. A. Lopez, F. Borracci, C. Delgado Mendez, Alessandro Carosi, Jose Miguel Miranda, Ivica Puljak, Glawion, D., Universitat de Barcelona, Ahnen, M. L, Ansoldi, S., Antonelli, L. A., Antoranz, P., Babic, A., Banerjee, B., Bangale, P., Barres De Almeida, U., Barrio, J. A., Becerra González, J., Bednarek, W., Bernardini, E., Biasuzzi, B., Biland, A., Blanch, O., Bonnefoy, S., Bonnoli, G., Borracci, F., Bretz, T., Carmona, E., Carosi, A., Chatterjee, A., Clavero, R., Colin, P., Colombo, E., Contreras, J. L., Cortina, J., Covino, S., Da Vela, P., Dazzi, F., De Angelis, A., De Caneva, G., De Lotto, B., De Oña Wilhelmi, E., Delgado Mendez, C., Di Pierro, F., Dominis Prester, D., Dorner, D., Doro, M., Einecke, S., Elsaesser, D., Fernández Barral, A., Fidalgo, D., Fonseca, M. V., Font, L., Frantzen, K., Fruck, C., Galindo, D., García López, R. J., Garczarczyk, M., Garrido Terrats, D., Gaug, M., Giammaria, P., Godinović, N., González Muñoz, A., Guberman, D., Hanabata, Y., Hayashida, M., Herrera, J., Hose, J., Hrupec, D., Hughes, G., Idec, W., Kodani, K., Konno, Y., Kubo, H., Kushida, J., La Barbera, A., Lelas, D., Lindfors, E., Lombardi, S., Longo, Francesco, López, M., López Coto, R., López Oramas, A., Lorenz, E., Majumdar, P., Makariev, M., Mallot, K., Maneva, G., Manganaro, M., Mannheim, K., Maraschi, L., Marcote, B., Mariotti, M., Martínez, M., Mazin, D., Menzel, U., Miranda, J. M., Mirzoyan, R., Moralejo, A., Nakajima, D., Neustroev, V., Niedzwiecki, A., Nievas Rosillo, M., Nilsson, K., Nishijima, K., Noda, K., Orito, R., Overkemping, A., Paiano, S., Palacio, J., Palatiello, Michele, Paneque, D., Paoletti, R., Paredes, J. M., Paredes Fortuny, X., Persic, M., Poutanen, J., Prada Moroni, P. G., Prandini, E., Puljak, I., Reinthal, R., Rhode, W., Ribó, M., Rico, J., Rodriguez Garcia, J., Rügamer, S., Saito, T., Satalecka, K., Scapin, V., Schultz, C., Schweizer, T., Shore, S. N., Sillanpää, A., Sitarek, J., Snidaric, I., Sobczynska, D., Stamerra, A., Steinbring, T., Strzys, M., Takalo, L., Takami, H., Tavecchio, F., Temnikov, P., Terzić, T., Tescaro, D., Teshima, M., Thaele, J., Torres, D. F., Toyama, T., Treves, A., Verguilov, V., Vovk, I., Ward, J. E., Will, M., Wu, M. H., Zanin, R., Lucarelli, F., Pittori, C., Vercellone, S., Berdyugin, A., Carini, M. T., Lähteenmäki, A., Pasanen, M., Pease, A., Sainio, J., Tornikoski, M., Walters, R., Department of Radio Science and Engineering, Aalto-yliopisto, and Aalto University
Subjects: galaxie [X-rays], galaxie [Gamma-rays], Radiation mechanisms: non-thermal, radiation mechanisms: non-thermal, galaxies: active, gamma-rays, galaxies, X-rays: galaxies, BL-LACERTAE OBJECTS, ACTIVE GALACTIC NUCLEI, LARGE-AREA TELESCOPE, GAMMA-RAY EMISSION, SPECTRAL ENERGY-DISTRIBUTIONS, ALL-SKY SURVEY, LAC, OBJECTS, X-RAY, MAGIC TELESCOPES, SOURCE CATALOG, Astrophysics, Galaxies: active, Gamma-rays: galaxies, Astronomy and Astrophysics, Space and Planetary Science, 01 natural sciences, Radiació, law.invention, law, MAGIC (telescope), 010303 astronomy & astrophysics, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Spectral index, Radiation, Gamma ray, galaxies [Gamma-rays], galaxies [X-rays], Electrónica, Física nuclear, Electricidad, Astrophysics - High Energy Astrophysical Phenomena, Flare, BL Lac object, Active galactic nucleus, radiation mechanisms, non-thermal galaxies, active gamma-rays, galaxies X-rays, active [Galaxies], Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, 0103 physical sciences, Blazar, ta115, non-thermal [Radiation mechanisms], 010308 nuclear & particles physics, Astronomy, Astronomy and Astrophysic, Light curve, Galàxies actives, Active galaxies, ddc:520
Abstract: The BL Lac object 1ES 1011+496 was discovered at Very High Energy gamma-rays by MAGIC in spring 2007. Before that the source was little studied in different wavelengths. Therefore a multi-wavelength (MWL) campaign was organized in spring 2008. Along MAGIC, the MWL campaign included the Metsahovi radio observatory, Bell and KVA optical telescopes and the Swift and AGILE satellites. MAGIC observations span from March to May, 2008 for a total of 27.9 hours, of which 19.4 hours remained after quality cuts. The light curve showed no significant variability. The differential VHE spectrum could be described with a power-law function. Both results were similar to those obtained during the discovery. Swift XRT observations revealed an X-ray flare, characterized by a harder when brighter trend, as is typical for high synchrotron peak BL Lac objects (HBL). Strong optical variability was found during the campaign, but no conclusion on the connection between the optical and VHE gamma-ray bands could be drawn. The contemporaneous SED shows a synchrotron dominated source, unlike concluded in previous work based on nonsimultaneous data, and is well described by a standard one zone synchrotron self Compton model. We also performed a study on the source classification. While the optical and X-ray data taken during our campaign show typical characteristics of an HBL, we suggest, based on archival data, that 1ES 1011+496 is actually a borderline case between intermediate and high synchrotron peak frequency BL Lac objects., 13 pages, accepted for publication in MNRAS
Published: 2016
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54. Search for TeV Gamma-Rays from 3EG J1234-1318 with the Cangaroo-II Telescope

Author: Takahiro Hattori and Kyoshi Nishijima
Subjects: Space and Planetary Science, Astronomy and Astrophysics
Published: 2005
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55. Status of the CANGAROO-III Project

Author: S. Hayashi, S. Kabuki, T. Hara, J. R. Patterson, A. Asahara, Tatsuo Yoshida, Toru Tanimori, D. Nishida, C. Itoh, Ryoji Enomoto, R. Kurosaka, A. Kawachi, G. J. Thornton, L. T. Ksenofontov, Takanori Yoshikoshi, H. Moro, Tadashi Kifune, T. Uchida, Shuichi Gunji, Tsuguya Naito, Geoffrey V. Bicknell, T. Hattori, D. L. Swaby, Kyoshi Nishijima, Hiroshi Muraishi, Ko Okumura, K. Sakurazawa, Masatoshi Ohishi, T. Kurihara, T. Yamaoka, Y. Miyashita, Yutaka Matsubara, T. Nakase, Y. Doi, Hidetoshi Kubo, F. Kajino, Roger W Clay, H. Tanimura, Shinji Hara, J. Kushida, N. Sakamoto, K. Tsuchiya, S. Watanabe, R. J. Protheroe, Fuyuki Tokanai, Yoshihiko Mizumoto, Masaki Mori, Yasushi Muraki, Shohei Yanagita, Hideaki Katagiri, and P. G. Edwards
Subjects: Physics, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Cherenkov Telescope Array, law.invention, Telescope, Space and Planetary Science, law, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Galaxy Astrophysics, Cherenkov radiation
Abstract: 著者人数: 51名, 資料番号: SA1003983000
Published: 2004

56. Very high-energy gamma-ray observations of novae and dwarf novae with the MAGIC telescopes

Author: J. Kushida, Jose Luis Contreras, Juan Cortina, Tomislav Terzić, A. De Angelis, A. Treves, Vitaly Neustroev, M. Hayashida, Marc Ribó, Marina Manganaro, P. Bangale, D. Galindo, Hidetoshi Kubo, B. Biasuzzi, Abelardo Moralejo, H. Takami, Vassil Verguilov, G. Maneva, D. Nakajima, Konstancja Satalecka, Michele Doro, Giacomo Bonnoli, Julia Thaele, M. I. Martínez, R. Zanin, Adrian Biland, Arka Chatterjee, P. G. Prada Moroni, T. Steinbring, D. Fidalgo, K. Mallot, R. J. García López, J. Rico, M. Palatiello, Kyoshi Nishijima, Yusuke Konno, Sabrina Einecke, Pratik Majumdar, R. Reinthal, Francesco Dazzi, Gareth Hughes, M. V. Fonseca, K. Kodani, C. Schultz, V. Scapin, J. Rodriguez Garcia, Dominik Elsaesser, U. Barres de Almeida, R. Desiante, Stefano Covino, R. López-Coto, B. Banerjee, Max Ludwig Ahnen, Stefano Ansoldi, A. Niedzwiecki, Riccardo Paoletti, G. De Caneva, Damir Lelas, Massimo Persic, D. Tescaro, David Paneque, K. Saito, J. Palacio, Ievgen Vovk, D. Guberman, Dorota Sobczyńska, Julian Sitarek, J. M. Paredes, Antonio Stamerra, P. Giammaria, L. Maraschi, Nikola Godinovic, Benito Marcote, E. Hays, Elina Lindfors, J. Hose, Daniel Mazin, T. Toyama, Hanna Kellermann, B. De Lotto, T. Schweizer, D. Dominis Prester, Ivica Puljak, S. Bonnefoy, R. Clavero, P. Temnikov, Pierre Colin, L. A. Antonelli, Kari Nilsson, M. Will, K. Frantzen, Thomas Bretz, F. Di Pierro, R. Mirzoyan, Juri Poutanen, D. Garrido Terrats, P. Da Vela, Wlodek Bednarek, Alessandro Carosi, E. de Oña Wilhelmi, Y. Hanabata, J. A. Barrio, P. Antoranz, E. Carmona, Masahiro Teshima, S. Paiano, Wolfgang Rhode, Karl Mannheim, Jose Miguel Miranda, Fabrizio Tavecchio, Alicia López-Oramas, Ana Babić, F. Borracci, I. Snidaric, Natalia Lewandowska, A. La Barbera, D. Eisenacher Glawion, X. Paredes-Fortuny, M. Nievas Rosillo, E. Lorenz, J. Becerra González, Takashi Saito, Reiko Orito, E. Prandini, U. Menzel, Daniela Dorner, Diego F. Torres, M. Garczarczyk, A. Sillanpää, E. Colombo, M. Gaug, J. Herrera, L. O. Takalo, Francesco Longo, Koji Noda, Elisa Bernardini, Lluis Font, Marcel Strzys, Martin Makariev, Oscar Blanch, Alba Fernández-Barral, W. Idec, Christian Fruck, Mosè Mariotti, A.-K. Overkemping, Dario Hrupec, M. A. Lopez, A. González Muñoz, Saverio Lombardi, C. Delgado Mendez, Ahnen, M. L, Ansoldi, S., Antonelli, L. A., Antoranz, P., Babic, A., Banerjee, B., Bangale, P., Barres De Almeida, U., Barrio, J. A., Becerra González, J., Bednarek, W., Bernardini, E., Biasuzzi, B., Biland, A., Blanch, O., Bonnefoy, S., Bonnoli, G., Borracci, F., Bretz, T., Carmona, E., Carosi, A., Chatterjee, A., Clavero, R., Colin, P., Colombo, E., Contreras, J. L., Cortina, J., Covino, S., Da Vela, P., Dazzi, F., De Angelis, A., De Caneva, G., De Lotto, B., De Oña Wilhelmi, E., Delgado Mendez, C., Di Pierro, F., Dominis Prester, D., Dorner, D., Doro, M., Einecke, S., Eisenacher Glawion, D., Elsaesser, D., Fernández Barral, A., Fidalgo, D., Fonseca, M. V., Font, L., Frantzen, K., Fruck, C., Galindo, D., García López, R. J., Garczarczyk, M., Garrido Terrats, D., Gaug, M., Giammaria, P., Godinović, N., González Muñoz, A., Guberman, D., Hanabata, Y., Hayashida, M., Herrera, J., Hose, J., Hrupec, D., Hughes, G., Idec, W., Kellermann, H., Kodani, K., Konno, Y., Kubo, H., Kushida, J., La Barbera, A., Lelas, D., Lewandowska, N., Lindfors, E., Lombardi, S., Longo, Francesco, López, M., López Coto, R., López Oramas, A., Lorenz, E., Majumdar, P., Makariev, M., Mallot, K., Maneva, G., Manganaro, M., Mannheim, K., Maraschi, L., Marcote, B., Mariotti, M., Martínez, M., Mazin, D., Menzel, U., Miranda, J. M., Mirzoyan, R., Moralejo, A., Nakajima, D., Neustroev, V., Niedzwiecki, A., Nievas Rosillo, M., Nilsson, K., Nishijima, K., Noda, K., Orito, R., Overkemping, A., Paiano, S., Palacio, J., Palatiello, M., Paneque, D., Paoletti, R., Paredes, J. M., Paredes Fortuny, X., Persic, M., Poutanen, J., Prada Moroni, P. G., Prandini, E., Puljak, I., Reinthal, R., Rhode, W., Ribó, M., Rico, J., Rodriguez Garcia, J., Saito, T., Saito, K., Satalecka, K., Scapin, V., Schultz, C., Schweizer, T., Sillanpää, A., Sitarek, J., Snidaric, I., Sobczynska, D., Stamerra, A., Steinbring, T., Strzys, M., Takalo, L., Takami, H., Tavecchio, F., Temnikov, P., Terzić, T., Tescaro, D., Teshima, M., Thaele, J., Torres, D. F., Toyama, T., Treves, A., Verguilov, V., Vovk, I., Will, M., Zanin, R., Desiante, R., Hays, E., and Universitat de Barcelona
Subjects: Proton, Hadron, Astrophysics, 01 natural sciences, 7. Clean energy, law.invention, Raigs gamma, law, Astrophysics::Solar and Stellar Astrophysics, novae, cataclysmic variables, gamma rays: stars, binaries: general, stars: activity, 010303 astronomy & astrophysics, Dwarf nova, Novae, Estels binaris de raigs X, astro-ph.HE, Physics, Novae, cataclysmic variable, cataclysmic variables, Binaries: general, Gamma rays: stars, Novae, cataclysmic variables, Stars: activity, Astronomy and Astrophysics, Space and Planetary Science, Gamma-rays, stars, Binaries, general, Stars, activity, Gamma ray, X-ray binaries, Electrónica, Física nuclear, Electricidad, Astrophysics - High Energy Astrophysical Phenomena, activity [Stars], Astrophysics::High Energy Astrophysical Phenomena, Noves (Estels), Telescope, star [Gamma rays], 0103 physical sciences, New stars, general [Binaries], 010308 nuclear & particles physics, Gamma rays, Astronomy and Astrophysic, 13. Climate action, ddc:520, High Energy Physics::Experiment, Fermi Gamma-ray Space Telescope, Lepton
Abstract: Context. In the last five years the Fermi Large Area Telescope (LAT) instrument detected GeV {\gamma}-ray emission from five novae. The GeV emission can be interpreted in terms of an inverse Compton process of electrons accelerated in a shock. In this case it is expected that protons in the same conditions can be accelerated to much higher energies. Consequently they may produce a second component in the {\gamma}-ray spectrum at TeV energies. Aims. We aim to explore the very-high-energy domain to search for {\gamma}-ray emission above 50 GeV and to shed light on the acceleration process of leptons and hadrons in nova explosions. Methods. We have performed observations with the MAGIC telescopes of the classical nova V339 Del shortly after the 2013 outburst, triggered by optical and subsequent GeV {\gamma}-ray detec- tions. We also briefly report on VHE observations of the symbiotic nova YY Her and the dwarf nova ASASSN-13ax. We complement the TeV MAGIC observations with the analysis of con- temporaneous Fermi-LAT data of the sources. The TeV and GeV observations are compared in order to evaluate the acceleration parameters for leptons and hadrons. Results. No significant TeV emission was found from the studied sources. We computed upper limits on the spectrum and night-by-night flux. The combined GeV and TeV observations of V339 Del limit the ratio of proton to electron luminosities to Lp, Comment: 7 pages, 2 figures, accepted for publication in A&A
Published: 2015
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57. Determination of solar neutrino oscillation parameters using 1496 days of Super-Kamiokande-I data

Author: Masatoshi Koshiba, Takashi Kobayashi, M. Ishitsuka, Shoichi Yamada, Takaaki Kajita, A. Kibayashi, L. R. Sulak, Shantanu Desai, Y. Ichikawa, K. Kobayashi, M. D. Messier, Y. Totsuka, T. Shibata, K. Kaneyuki, M. Takita, J. Shirai, S. Tasaka, W. E. Keig, Atsumu Suzuki, M. Earl, D. W. Liu, John G. Learned, M. Etoh, R. Nishimura, Makoto Sakuda, G. W. Sullivan, A. L. Stachyra, K. Miyano, C. W. Walter, Y. Nagashima, S. Matsuno, E. Sharkey, S. Dazeley, Hyosun Kim, D. Takemori, R. Svoboda, G. Guillian, R. W. Ellsworth, C. McGrew, A. M. Gago, K. Martens, S. Moriyama, C. Saji, J. Kameda, J. L. Stone, David William Casper, S. Nakayama, Yoshihiro Suzuki, T. Ishii, Kunio Inoue, Yoshitaka Itow, M. L. Chen, D. Turč, Y. Obayashi, J. A. Goodman, C. Mitsuda, K. S. Ganezer, T. Inagaki, Y. Kajiyama, S. Hatakeyama, R. J. Wilkes, M. Goldhaber, Y. Gando, M. Koike, Toshio Namba, Henry W. Sobel, K. Nitta, M. Ackermann, Y. Fukuda, E. Kearns, B. Viren, Koji Nakamura, S. Mine, Kyoshi Nishijima, Masayuki Nakahata, K. Nishikawa, M. Miura, Y. Takeuchi, Todd Haines, M. B. Smy, S. C. Boyd, T. Ishizuka, S. Fukuda, A. K. Ichikawa, Minoru Yoshida, C. Yanagisawa, H. Okazawa, K. Ishihara, A. Suzuki, M. Kohama, T. Iwashita, J. Hill, A. Okada, N. Sakurai, H. G. Berns, Alec Habig, Y. Watanabe, Mikio Morii, E. Blaufuss, Tsuyoshi Nakaya, C. K. Jung, C. Mauger, T. Toshito, J. Yoo, D. Kielczewska, Magdalena Malek, T. Maruyama, Masato Shiozawa, I. Kato, T. Barszczak, H. Takeuchi, Y. Hatakeyama, S. B. Kim, W. R. Kropp, Y. Oyama, Y. Hayato, Yusuke Koshio, Takehisa Hasegawa, Hirokazu Ishino, M. R. Vagins, W. Gajewski, and Kate Scholberg
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Standard solar model, Solar neutrino, High Energy Physics::Phenomenology, Solar neutrino problem, High Energy Physics - Experiment, Nuclear physics, Neutrino detector, High Energy Physics::Experiment, Neutrino, GALLEX, Super-Kamiokande, Neutrino oscillation
Abstract: A number of different fits to solar neutrino mixing and mass square difference were performed using 1496 days of Super-Kamiokande-I's solar neutrino data. These data select two allowed areas at large neutrino mixing when combined with either the solar $^8$B flux prediction of the standard solar model or the SNO interaction rate measurements. A global fit combining SK data with the solar neutrino interaction rates measured by Homestake, SNO, Gallex/GNO and SAGE prefers a single allowed area, the Large Mixing Angle solution, at the 98.9% confidence level. The mass square difference $\Delta m^2$ between the two mass eigenstates ranges from about 3 to $19\times10^{-5}$eV$^2$, while the mixing angle $\theta$ is in the range of $\tan^2\theta\approx$0.25--0.65., Comment: 10 Pages, 4 figures, submitted to Physics Letters B
Published: 2002
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58. The acceleration of cosmic-ray protons in the supernova remnant RX J1713.7–3946

Author: Takanori Yoshikoshi, Yoshihiko Mizumoto, Tsuguya Naito, A. Asahara, Fuyuki Tokanai, Geoffrey V. Bicknell, Masatoshi Ohishi, K. Sakurazawa, Ryoji Enomoto, Shinji Hara, K. Uruma, Ko Okumura, Teruhiko Yoshida, Ryo Suzuki, J. Kushida, Masaki Mori, A. Maeshiro, A. Kawachi, F. Kajino, T. Takano, H. Tsunoo, Toru Tanimori, M. Moriya, Shohei Yanagita, Yasushi Muraki, C. Itoh, H. Muraishi, Kyoshi Nishijima, Yutaka Matsubara, S. Hayashi, S. Kabuki, K. Tsuchiya, Tadashi Kifune, S. Maeda, Hidetoshi Kubo, T. Nakase, Jun Kataoka, T. Hara, Shuichi Gunji, A. Watanabe, D. L. Swaby, J. R. Patterson, P. G. Edwards, Hideaki Katagiri, and K. Takano
Subjects: Physics, Multidisciplinary, Proton, Astrophysics::High Energy Astrophysical Phenomena, Interstellar cloud, Gamma ray, Cosmic ray, Astrophysics, Nuclear physics, Interstellar medium, Supernova, Pion, High Energy Physics::Experiment, Supernova remnant, Astrophysics::Galaxy Astrophysics
Abstract: Protons with energies up to approximately 10(15) eV are the main component of cosmic rays, but evidence for the specific locations where they could have been accelerated to these energies has been lacking. Electrons are known to be accelerated to cosmic-ray energies in supernova remnants, and the shock waves associated with such remnants, when they hit the surrounding interstellar medium, could also provide the energy to accelerate protons. The signature of such a process would be the decay of pions (pi(0)), which are generated when the protons collide with atoms and molecules in an interstellar cloud: pion decay results in gamma-rays with a particular spectral-energy distribution. Here we report the observation of cascade showers of optical photons resulting from gamma-rays at energies of approximately 10(12) eV hitting Earth's upper atmosphere, in the direction of the supernova remnant RX J1713.7-3946. The spectrum is a good match to that predicted by pion decay, and cannot be explained by other mechanisms.
Published: 2002
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59. The Possibility for The Detection of the Sub-TeV Gamma-Ray Emission from Fermi Blazars

Author: Kazuhito Kodani, Kyoshi Nishijima, J. Kushida, and Shimpei Tsujimoto
Subjects: Physics, High energy, Extragalactic background light, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Flux, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Blazar, Galaxy, Redshift, Fermi Gamma-ray Space Telescope
Abstract: Measurements of the very high energy(VHE) gamma-ray flux from high-redshift blazars are useful for understanding the cosmological evolution of galaxies, because gamma-ray emission from distant blazars is affected by Extragalactic Background Light(EBL). We searched for the detectable VHE gamma-ray blazars with known redshifts using Fermi archive data and selected three high-redshift sources, PKS 0118-272(z=0.558), PKS0454-234(z=1.003) and PKS 1244-255(z=0.633).
Published: 2014
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60. SolarB8and hep Neutrino Measurements from 1258 Days of Super-Kamiokande Data

Author: Y. Watanabe, J. Hill, M. Morii, T. Toshito, Minoru Yoshida, Y. Nagashima, J. A. Goodman, Y. Oyama, S. Tasaka, W. E. Keig, Y. Hayato, C. W. Walter, Atsumu Suzuki, Yusuke Koshio, B. Lee, K. Kaneyuki, Magdalena Malek, Soo-Bong Kim, M. B. Smy, Y. Fukuda, E. Kearns, Yoshitaka Itow, K. Nishikawa, M. Takita, L. R. Price, J. Shirai, M. Koike, H. Takeuchi, A. Suzuki, B. Viren, C. Saji, E. Sharkey, S. Dazeley, G. Guillian, S. Moriyama, M. Kohama, K. Ishihara, C. Mitsuda, C. McGrew, S. Matsuno, C. K. Jung, Tsuyoshi Nakaya, Heekyong Kim, H. Okazawa, D. Kielczewska, Yoshihiro Suzuki, C. Mauger, J. Yoo, Y. Totsuka, T. Ishii, M. Goldhaber, Kunio Inoue, Masato Shiozawa, Y. Takeuchi, R. J. Wilkes, T. Barszczak, U. Golebiewska, Alec Habig, M. Earl, D. W. Liu, R. Svoboda, J. Kameda, G. W. Sullivan, Takehisa Hasegawa, Masayuki Nakahata, Y. Gando, M. Ishitsuka, Hirokazu Ishino, Y. Hatakeyama, S. Mine, Shantanu Desai, Y. Ichikawa, A. L. Stachyra, K. Miyano, Takashi Kobayashi, W. R. Kropp, Tomoyuki Maruyama, R. W. Ellsworth, J. L. Stone, Henry W. Sobel, K. Nitta, H. Fujiyasu, E. Blaufuss, Kyoshi Nishijima, T. Inagaki, M. R. Vagins, Koji Nakamura, Masatoshi Koshiba, M. Miura, W. Gajewski, Kate Scholberg, A. Kibayashi, L. R. Sulak, T. Shibata, M. D. Messier, Makoto Sakuda, S. C. Boyd, T. Ishizuka, Y. Obayashi, K. Martens, John G. Learned, K. Kobayashi, Y. Kajiyama, Shoichi Yamada, Takaaki Kajita, M. Etoh, K. S. Ganezer, Todd Haines, D. Turcan, C. Yanagisawa, A. Okada, N. Sakurai, S. Nakayama, David William Casper, A. Sakai, and D. Takemori
Subjects: Physics, Sudbury Neutrino Observatory, Particle physics, Recoil, Solar neutrino, General Physics and Astronomy, Flux, Electron, Neutrino, Super-Kamiokande, Energy (signal processing)
Abstract: Solar neutrino measurements from 1258days of data from the Super-Kamiokande detector are presented. The measurements are based on recoil electrons in the energy range 5.0{endash}20.0MeV. The measured solar neutrino flux is 2.32{+-}0.03(stat){sup +0.08}{sub {minus}0.07}(syst){times}10{sup 6} cm{sup {minus}2}s{sup {minus}1} , which is 45.1{+-}0.5(stat ){sup +1.6}{sub {minus}1.4}(syst) % of that predicted by the BP2000 SSM. The day vs night flux asymmetry ({Phi}{sub n}{minus}{Phi}{sub d})/ {Phi}{sub average} is 0.033{+-}0.022(stat){sup +0.013}{sub {minus}0.012}(syst) . The recoil electron energy spectrum is consistent with no spectral distortion. For the hep neutrino flux, we set a 90% C.L.upper limit of 40{times}10{sup 3} cm{sup {minus}2}s{sup {minus}1} , which is 4.3times the BP2000 SSM prediction.
Published: 2001
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61. Constraints on Neutrino Oscillations Using 1258 Days of Super-Kamiokande Solar Neutrino Data

Author: Hirokazu Ishino, H. Takeuchi, K. Kaneyuki, Makoto Sakuda, M. Ishitsuka, K. Martens, K. Kobayashi, S. Matsuno, T. Shibata, Minoru Yoshida, David William Casper, Shantanu Desai, Y. Ichikawa, A. Sakai, Y. Takeuchi, J. L. Stone, E. Blaufuss, S. Nakayama, John G. Learned, Henry W. Sobel, K. Nitta, D. Turcan, R. W. Ellsworth, Kyoshi Nishijima, A. L. Stachyra, K. Miyano, Y. Watanabe, D. Takemori, M. Etoh, G. Guillian, S. Moriyama, T. Ishii, Kunio Inoue, Tomoyuki Maruyama, C. W. Walter, T. Inagaki, Y. Hatakeyama, M. Goldhaber, B. Viren, J. Hill, M. Morii, S. Tasaka, W. E. Keig, Shoichi Yamada, Takaaki Kajita, Koji Nakamura, T. Toshito, Soo-Bong Kim, M. Takita, L. R. Price, J. Shirai, C. Yanagisawa, D. W. Liu, Yoshitaka Itow, C. K. Jung, Y. Fukuda, E. Kearns, Todd Haines, Atsumu Suzuki, D. Kielczewska, M. Miura, Takehisa Hasegawa, E. Sharkey, G. W. Sullivan, S. Fukuda, M. Koike, S. Dazeley, Masayuki Nakahata, K. Nishikawa, C. McGrew, Magdalena Malek, M. R. Vagins, N. Sakurai, A. Okada, H. Okazawa, K. Ishihara, W. Gajewski, Kate Scholberg, Yoshihiro Suzuki, H. Fujiyasu, Y. Nagashima, Y. Kajiyama, J. Kameda, K. S. Ganezer, K. B. Lee, Alec Habig, Y. Totsuka, C. Saji, J. A. Goodman, M. Earl, Takashi Kobayashi, S. C. Boyd, T. Ishizuka, Masatoshi Koshiba, Y. Obayashi, A. Kibayashi, L. R. Sulak, C. Mitsuda, R. Svoboda, R. J. Wilkes, U. Golebiewska, K. K. Young, S. Mine, M. B. Smy, M. D. Messier, M. Kohama, Heekyong Kim, C. Mauger, J. Yoo, Masato Shiozawa, T. Barszczak, Y. Gando, W. R. Kropp, A. Suzuki, Tsuyoshi Nakaya, Y. Oyama, Y. Hayato, and Yusuke Koshio
Subjects: Physics, Particle physics, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, High Energy Physics::Phenomenology, General Physics and Astronomy, Flux, Solar neutrino problem, High Energy Physics - Experiment, Nuclear physics, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Super-Kamiokande, Neutrino oscillation, Zenith
Abstract: We report the result of a search for neutrino oscillations using precise measurements of the recoil electron energy spectrum and zenith angle variations of the solar neutrino flux from 1258 days of neutrino-electron scattering data in Super-Kamiokande. The absence of significant zenith angle variation and spectrum distortion places strong constraints on neutrino mixing and mass difference in a flux-independent way. Using the Super-Kamiokande flux measurement in addition, two allowed regions at large mixing are found., Comment: 6 pages, 4 figures, submitted to PRL
Published: 2001
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62. The Super-Kamiokande experiment

Author: Kyoshi Nishijima
Subjects: Physics, Radiation, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, High Energy Physics::Phenomenology, Astronomy, Solar neutrino problem, Cosmic neutrino background, Measurements of neutrino speed, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Neutrino astronomy, Neutrino, Super-Kamiokande, Neutrino oscillation
Abstract: Super-Kamiokande has accumulated data on atmospheric neutrinos and solar neutrinos for 1117–1289 live days. We present updated results on the flavor ratio, the zenith angle distribution of atmospheric neutrinos and the zenith angle distribution of upward going muons. We also present results on the energy spectrum and the day–night variation of solar neutrinos. The data on atmospheric neutrinos show clear evidence of neutrino oscillation.
Published: 2001
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63. Tau Neutrinos Favored over Sterile Neutrinos in Atmospheric Muon Neutrino Oscillations

Author: C. Yanagisawa, Y. Takeuchi, S. Nakayama, H. Fujiyasu, Minoru Yoshida, S. Inaba, N. Sakurai, Y. Totsuka, K. S. Ganezer, M. Etoh, H. Takeuchi, C. Mitsuda, K. Kaneyuki, Y. Gando, C. W. Walter, R. J. Wilkes, U. Golebiewska, B. K. Kim, R. W. Ellsworth, Hirokazu Ishino, H. Okazawa, K. Kobayashi, K. K. Young, S. Fukuda, M. L. Chen, R. Svoboda, S. Mine, Todd Haines, M. Earl, T. Maruyama, T. Inagaki, J. Hill, Atsumu Suzuki, Koji Nakamura, Soo-Bong Kim, M. Takita, L. R. Price, J. Shirai, E. Blaufuss, A. Suzuki, M. Miura, Y. Fukuda, E. Kearns, Y. Obayashi, John G. Learned, Masatoshi Koshiba, A. Kibayashi, E. Sharkey, A. Okada, L. R. Sulak, J. L. Stone, G. W. Sullivan, Shoichi Yamada, Takaaki Kajita, C. Mauger, Masato Shiozawa, C. Saji, Henry W. Sobel, K. Nitta, T. Barszczak, J. Kameda, Y. Nagashima, Kyoshi Nishijima, K. Nishikawa, S. C. Boyd, T. Ishizuka, C. McGrew, Y. Watanabe, R. Sanford, M. D. Messier, J. A. Goodman, Yoshihiro Suzuki, M. Morii, K. Ishihara, T. Toshito, M. B. Smy, S. Matsuno, Osamu Sasaki, M. Kohama, Magdalena Malek, Ko Okumura, Takehisa Hasegawa, T. Ishii, Kunio Inoue, Alec Habig, Takashi Kobayashi, M. R. Vagins, W. Gajewski, Kate Scholberg, Masayuki Nakahata, G. Guillian, S. Moriyama, M. Takahashi, M. Goldhaber, M. Ishitsuka, Y. Ichikawa, A. L. Stachyra, K. Miyano, Y. Oyama, Y. Hayato, B. Viren, Yusuke Koshio, C. K. Jung, M. Takahata, D. Kielczewska, W. R. Kropp, Makoto Sakuda, K. Martens, David William Casper, A. Sakai, Yoshitaka Itow, M. Kirisawa, M. Koike, D. Takemori, S. Tasaka, W. E. Keig, and Y. Hatakeyama
Subjects: Physics, Sterile neutrino, Particle physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, High Energy Physics::Phenomenology, General Physics and Astronomy, Solar neutrino problem, High Energy Physics - Experiment, Cosmic neutrino background, Neutrino detector, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Neutrino astronomy
Abstract: The previously published atmospheric neutrino data did not distinguish whether muon neutrinos were oscillating into tau neutrinos or sterile neutrinos, as both hypotheses fit the data. Using data recorded in 1100 live-days of the Super-Kamiokande detector, we use three complementary data samples to study the difference in zenith angle distribution due to neutral currents and matter effects. We find no evidence favoring sterile neutrinos, and reject the hypothesis at the 99% confidence level. On the other hand, we find that oscillation between muon and tau neutrinos suffices to explain all the results in hand., Comment: 9 pages with 2 figures, submitted to PRL
Published: 2000
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64. Measurement of the Flux and Zenith-Angle Distribution of Upward Throughgoing Muons by Super-Kamiokande

Author: L. R. Price, J. Shirai, E. Sharkey, C. K. Jung, S. Mine, M. Takahata, D. Kielczewska, J. W. Flanagan, Y. Kanaya, Hiroshi Ogawa, Takehisa Hasegawa, Y. Hayato, Y. Watanabe, R. Sanford, J. A. Goodman, Kazumasa Miyano, Minoru Yoshida, H. Okazawa, T. Iwamoto, Ken-ichiro Kobayashi, David William Casper, E. Ichihara, C. W. Walter, Yuichi Oyama, F. Tsushima, Todd Haines, W. Doki, S. Hatakeyama, Takaaki Kajita, H. Ishino, A. Sakai, Yusuke Koshio, L. Wai, Michael B. Smy, Nobuyuki Sakurai, W. E. Keig, Mark R. Vagins, Tomoyuki Maruyama, T. Kobayashi, C. Mauger, Makoto Sakuda, Junichi Kanzaki, K. Nakamura, J. Kameda, B. Viren, M. Miura, Frederick Reines, Ko Okumura, Masatoshi Koshiba, T. Hayakawa, S. Matsuno, T. Ishii, M. D. Messier, Soo-Bong Kim, S. Kasuga, Y. Fukuda, M. Goldhaber, S. Echigo, Yasunari Suzuki, K. Martens, V. J. Stenger, A. Suzuki, R. Svoboda, A. Okada, S. Tasaka, W. R. Kropp, Atsumu Suzuki, A. Kibayashi, Masayuki Nakahata, Y. Totsuka, J. L. Stone, C. Yanagisawa, K. Fujita, E. Kearns, M. L. Chen, W. Gajewski, Kate Scholberg, Kunio Inoue, C. McGrew, K. Ishihara, M. Takita, Y. Takeuchi, K. Kaneyuki, C. Saji, M. Earl, E. Blaufuss, Shinya Yamada, M. Etoh, Masato Shiozawa, K. S. Ganezer, A. L. Stachyra, John G. Learned, Yoshitaka Itow, T. Barszczak, Kyoshi Nishijima, Takashi Yamaguchi, R. W. Ellsworth, R. A. Doyle, T. Futagami, R. J. Wilkes, K. K. Young, Y. Kobayashi, G. W. Sullivan, M. Kohama, Alec Habig, J. S. George, M. Nemoto, L. R. Sulak, M. Koga, H. W. Sobel, Osamu Sasaki, D. Takemori, Shoei Nakayama, K. Nishikawa, J. Hill, Y. Nagashima, B. K. Kim, and Akira Hasegawa
Subjects: Physics, Muon, Astrophysics::High Energy Astrophysical Phenomena, General Physics and Astronomy, Flux, High Energy Physics - Experiment, Nuclear physics, Distribution (mathematics), Angular distribution, Muon flux, High Energy Physics::Experiment, Atomic physics, Super-Kamiokande, Zenith, Energy (signal processing)
Abstract: A total of 614 upward through-going muons of minimum energy 1.6 GeV are observed by Super-Kamiokande during 537 detector live days. The measured muon flux is 1.74+/-0.07(stat.)+/-0.02(sys.)x10^{-13}cm^{-2}s^{-1}sr^{-1} compared to an expected flux of 1.97+/-0.44(theo.)x10^{-13}cm^{-2}s^{-1}sr^{-1}. The absolute measured flux is in agreement with the prediction within the errors. However, the zenith angle dependence of the observed upward through-going muon flux does not agree with no-oscillation predictions. The observed distortion in shape is consistent with the \nu_\mu \nu_\tau oscillation hypothesis with \sin^22\theta > 0.4 and 1x10^{-3} < \Delta m^2 < 1x10^{-1} eV^{2} at 90% confidence level., Comment: 8 pages w/ 3 figures new version contains minor fixes, as it appears in PRL
Published: 1999
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65. Constraints on Neutrino Oscillation Parameters from the Measurement of Day-Night Solar Neutrino Fluxes at Super-Kamiokande

Author: Frederick Reines, K. Ishihara, T. Kobayashi, Kazumasa Miyano, M. Takita, Atsumu Suzuki, Shoei Nakayama, C. W. Walter, Todd Haines, Y. Totsuka, D. Takemori, E. Kearns, John G. Learned, W. Doki, C. K. Jung, M. Takahata, D. Kielczewska, Takaaki Kajita, H. Ishino, Y. Nagashima, T. Hasagawa, Takashi Yamaguchi, A. Suzuki, V. J. Stenger, C. Mauger, K. Nishikawa, T. Futagami, Y. Kanaya, T. Ishii, M. D. Messier, S. Tasaka, J. S. George, J. Hill, G. W. Sullivan, S. Echigo, R. A. Doyle, B. K. Kim, J. Hsu, K. Kaneyuki, P. G. Halverson, Soo-Bong Kim, M. Goldhaber, C. Saji, S. Kasuga, Y. Fukuda, R. Svoboda, M. Earl, M. Kohama, Minoru Yoshida, J. A. Goodman, W. R. Kropp, L. Wai, A. Okada, Y. Watanabe, R. Sanford, Y. Takeuchi, L. R. Sulak, R. J. Wilkes, Tomoyuki Maruyama, Shinya Yamada, Z. Conner, K. Fujita, K. K. Young, J. L. Stone, H. Okazawa, Y. Hayato, E. Blaufuss, K. Nakamura, David William Casper, C. Yanagisawa, Ken-ichiro Kobayashi, E. Ichihara, T. Iwamoto, H. W. Sobel, Michael B. Smy, S. Mine, A. Sakai, Yoshitaka Itow, M. Miura, Nobuyuki Sakurai, J. W. Flanagan, Yuichi Oyama, Hiroshi Ogawa, Masayuki Nakahata, T. Hayakawa, M. Etoh, A. L. Stachyra, Yusuke Koshio, F. Tsushima, W. E. Keig, Mark R. Vagins, B. Viren, K. S. Ganezer, J. Kameda, Y. Kobayashi, Osamu Sasaki, Masato Shiozawa, M. L. Chen, S. Hatakeyama, W. Gajewski, Kate Scholberg, R. W. Ellsworth, Ko Okumura, T. Barszczak, Masatoshi Koshiba, A. Kibayashi, Kunio Inoue, Kyoshi Nishijima, Makoto Sakuda, K. Martens, Junichi Kanzaki, C. McGrew, S. Matsuno, Yasunari Suzuki, Alec Habig, M. Koga, Akira Hasegawa, L. R. Price, J. Shirai, E. Sharkey, and M. Nemoto
Subjects: Physics, Sterile neutrino, Physics::Instrumentation and Detectors, Solar neutrino, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, General Physics and Astronomy, FOS: Physical sciences, Solar neutrino problem, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Neutrino detector, Measurements of neutrino speed, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Neutrino, Neutrino oscillation, Super-Kamiokande
Abstract: A search for day-night variations in the solar neutrino flux resulting from neutrino oscillations has been carried out using the 504 day sample of solar neutrino data obtained at Super-Kamiokande. The absence of a significant day-night variation has set an absolute flux independent exclusion region in the two neutrino oscillation parameter space., Comment: 11 pages, 3 figures, submitted to PRL, single-spacing
Published: 1999

66. Measurement of the Solar Neutrino Energy Spectrum Using Neutrino-Electron Scattering

Author: L. R. Price, J. Shirai, D. Takemori, J. Hill, Yuichi Oyama, C. Yanagisawa, C. K. Jung, M. Takahata, M. Takita, D. Kielczewska, Y. Totsuka, E. Sharkey, Y. Nagashima, Takaaki Kajita, H. Ishino, W. E. Keig, Mark R. Vagins, C. W. Walter, R. W. Ellsworth, E. Blaufuss, Masatoshi Koshiba, F. Tsushima, M. Earl, Takashi Yamaguchi, A. Kibayashi, T. Ishii, M. D. Messier, B. K. Kim, M. Goldhaber, B. Viren, Yohei Kobayashi, M. Etoh, J. Hsu, S. Echigo, P. G. Halverson, W. R. Kropp, K. S. Ganezer, Makoto Sakuda, K. Nakamura, David William Casper, A. T. Suzuki, R. J. Wilkes, Y. Kanaya, E. Ichihara, Soo-Bong Kim, Y. Hayato, K. Fujita, C. McGrew, E. Kearns, K. K. Young, S. Kasuga, K. Martens, Y. Watanabe, A. Sakai, R. Sanford, Y. Fukuda, Masayuki Nakahata, T. Iwamoto, Y. Takeuchi, Yusuke Koshio, M. Nemoto, H. Okazawa, S. Hatakeyama, Shinya Yamada, Z. Conner, S. Nakayama, K. Kaneyuki, C. Saji, Michael B. Smy, L. R. Sulak, S. Matsuno, Junichi Kanzaki, R. A. Doyle, Yasunari Suzuki, Todd Haines, S. Mine, N. Sakurai, A. L. Stachyra, C. Mauger, Alec Habig, K. Nishikawa, M. Koga, A. Okada, J. W. Flanagan, Masato Shiozawa, M. Kohama, Hiroshi Ogawa, J. L. Stone, T. Barszczak, J. S. George, J. A. Goodman, V. J. Stenger, Takehisa Hasegawa, A. Suzuki, R. Svoboda, Ko Okumura, Kunio Inoue, T. Kobayashi, W. Gajewski, Kate Scholberg, Frederick Reines, K. Ishihara, L. Wai, Tomoyuki Maruyama, H. W. Sobel, Osamu Sasaki, Kyoshi Nishijima, T. Hayakawa, Minoru Yoshida, G. W. Sullivan, John G. Learned, M. Miura, T. Futagami, Ken-ichiro Kobayashi, Yoshitaka Itow, J. Kameda, M. L. Chen, Kazumasa Miyano, W. Doki, S. Tasaka, and Akira Hasegawa
Subjects: Physics, Particle physics, Scattering, Physics::Instrumentation and Detectors, Solar neutrino, General Physics and Astronomy, Solar neutrino problem, High Energy Physics - Experiment, Nuclear physics, Recoil, Neutrino detector, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Neutrino oscillation
Abstract: A measurement of the energy spectrum of recoil electrons from solar neutrino scattering in the Super--Kamiokande detector is presented. The results shown here are obtained from 504 days of data taken between the 31st of May, 1996 and the 25th of March, 1998. The shape of the measured spectrum is compared with the expectation for solar B8 neutrinos. The comparison takes into account both kinematic and detector related effects in the measurement process. The spectral shape comparison between the observation and the expectation gives a chi-square of 25.3 with 15 degrees of freedom, corresponding to a 4.6% confidence level., Comment: 12 pages, 3 figures
Published: 1999

67. Calibration of Super-Kamiokande using an electron LINAC

Author: S. Matsuno, Ko Okumura, B. Viren, Akira Hasegawa, L. R. Price, J. Shirai, C. W. Walter, Shigeki Tasaka, E. Sharkey, Hiroshi Ogawa, Takehisa Hasegawa, Y. Nagashima, B. K. Kim, W. R. Kropp, J. A. Goodman, David William Casper, E. Ichihara, Kunio Inoue, Makoto Sakuda, Soo-Bong Kim, S. Kasuga, Y. Fukuda, K. Fujita, A. Sakai, Nobuyuki Sakurai, Y. Hayato, Tomoyuki Maruyama, Takaaki Kajita, H. Ishino, Masatoshi Koshiba, A. Kibayashi, Y. Takeuchi, T. Iwamoto, A. Okada, K. Nishikawa, Shinya Yamada, Y. Totsuka, Yuichi Oyama, C. K. Jung, M. Takahata, T. Ishii, J.W Flanagan, H. Kobayashi, V. J. Stenger, S Mine, Michael B. Smy, D. Kielczewska, Y. Kobayashi, Yusuke Koshio, Z. Conner, Masayuki Nakahata, W. Gajewski, Kate Scholberg, John G. Learned, Atsumu Suzuki, F. Tsushima, A. L. Stachyra, D. Takemori, M. Etoh, E. Kearns, T. Futagami, Alec Habig, Yasunari Suzuki, J. Hsu, M. Earl, M. Koga, L. Wai, Minoru Yoshida, M. Nemoto, Frederick Reines, C. Mauger, M. Goldhaber, K. S. Ganezer, G. W. Sullivan, K. Kaneyuki, C. Saji, Mark R. Vagins, H. Okazawa, E. Blaufuss, Masato Shiozawa, J. S. George, L. R. Sulak, R. A. Doyle, C. Yanagisawa, S. Hatakeyama, T. J. Haines, T. Barszczak, Kyoshi Nishijima, M. Miura, K. Martens, R. W. Ellsworth, Ken-ichiro Kobayashi, Y. Kanaya, J. Kameda, K. Ishihara, T. Hayakawa, M. L. Chen, Y. Watanabe, R. Sanford, M. Kohama, M. Takita, C. McGrew, Shoei Nakayama, J. Hill, J. L. Stone, Koji Nakamura, Takashi Yamaguchi, Junichi Kanzaki, H. W. Sobel, Osamu Sasaki, A. Suzuki, R. Svoboda, T. Kobayashi, P. G. Halverson, R. J. Wilkes, K. K. Young, Yoshitaka Itow, M. D. Messier, S. Echigo, Kazumasa Miyano, W. Doki, and W. E. Keig
Subjects: Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Solar neutrino, Detector, Solar neutrino problem, Linear particle accelerator, High Energy Physics - Experiment, Nuclear physics, Neutrino detector, Physics::Accelerator Physics, High Energy Physics::Experiment, Neutrino, Neutrino oscillation, Super-Kamiokande, Instrumentation
Abstract: In order to calibrate the Super-Kamiokande experiment for solar neutrino measurements, a linear accelerator (LINAC) for electrons was installed at the detector. LINAC data were taken at various positions in the detector volume, tracking the detector response in the variables relevant to solar neutrino analysis. In particular, the absolute energy scale is now known with less than 1 percent uncertainty., Comment: 24 pages, 16 figures, Submitted to NIM A
Published: 1999
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68. Measurements of the Solar Neutrino Flux from Super-Kamiokande's First 300 Days

Author: T. Hayakawa, R. A. Doyle, T. Yamaguchi, J. A. Goodman, C. McGrew, M. Kohama, Y. Hayato, John G. Learned, T. Futagami, T. Ishizuka, A. T. Suzuki, Masayuki Nakahata, T. Iwamoto, M. Ota, S. Hatakeyama, Yusuke Koshio, R. W. Ellsworth, G. W. Sullivan, Minoru Yoshida, W. E. Keig, Mark R. Vagins, Masatoshi Koshiba, H. Okazawa, H. W. Sobel, Ko Okumura, M. Masuzawa, A. Kibayashi, Y. Totsuka, Osamu Sasaki, J. L. Stone, Yohei Kobayashi, M. Miura, Makoto Sakuda, J. T. Hong, H. Koga, Y. Kitaguchi, Yuichi Oyama, T. Kinebuchi, S. B. Kim, N. Sakurai, Y. Takeuchi, Takaaki Kajita, H. Ishino, M. Goldhaber, Kunio Inoue, Masaki Mori, M. Earl, T. Maruyama, Frederick Reines, T. Ishii, W. R. Kropp, Akira Hasegawa, F. Tsushima, J. Hsu, K. Nakamura, Shinya Yamada, Z. Conner, J. S. George, J. W. Flanagan, Hiroshi Ogawa, K. Kobayashi, Kyoshi Nishijima, S. Nakayama, M. D. Messier, S. Echigo, A. Kusano, S. Matsuno, J. Kameda, Yasunari Suzuki, L. Wai, M. L. Chen, Takehisa Hasegawa, K. Nishikawa, K. Ishihara, M. Takita, P. G. Halverson, Todd Haines, L. R. Price, A. L. Stachyra, D. Takemori, M. Etoh, C. W. Walter, K. Martens, J. Hill, K. S. Ganezer, C. Mauger, Y. Kanaya, E. Sharkey, Y. Watanabe, R. Sanford, B. Viren, A. Okada, M. Nemoto, C. K. Jung, M. Takahata, S. Kasuga, T. Kobayashi, D. Kielczewska, Y. Fukuda, M. Oketa, Kazumasa Miyano, L. R. Sulak, W. Doki, E. Ichihara, W. Gajewski, Kate Scholberg, S. Tasaka, A. Sakai, Yoshitaka Itow, K. Fujita, Alec Habig, M. Koga, Y. Nagashima, A. Suzuki, R. Svoboda, E. Blaufuss, V. J. Stenger, Junichi Kanzaki, Masato Shiozawa, T. Barszczak, E. Kearns, J. Wilkes, K. Kaneyuki, C. Saji, K. K. Young, and C. Yanagisawa
Subjects: Physics, Standard solar model, Particle physics, Solar neutrino, General Physics and Astronomy, Flux, Electron, High Energy Physics - Experiment, Nuclear physics, Constant rate, Recoil, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Super-Kamiokande, Energy (signal processing)
Abstract: The first results of the solar neutrino flux measurement from Super-Kamiokande are presented. The results shown here are obtained from data taken between the 31st of May, 1996, and the 23rd of June, 1997. Using our measurement of recoil electrons with energies above 6.5 MeV, we infer the total flux of 8B solar neutrinos to be 2.42+-0.06(stat.)+0.10-0.07(syst.)*10^6/cm^2/s. This result is consistent with the Kamiokande measurement and is 36% of the flux predicted by the BP95 solar model. The flux is also measured in 1.5 month subsets and shown to be consistent with a constant rate., Comment: 7 pages, 3 figures
Published: 1998
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69. Evidence for Oscillation of Atmospheric Neutrinos

Author: Takaaki Kajita, H. Ishino, T. Ishii, T. Kobayashi, Alec Habig, L. Wai, J. Hsu, Tomoyuki Maruyama, Y. Totsuka, M. Koga, Ken-ichiro Kobayashi, Henry W. Sobel, S. Hatakeyama, D. Takemori, Kyoshi Nishijima, V. J. Stenger, M. Earl, Yoshitaka Itow, D. Casper, B. Viren, K. Nakamura, J. Kameda, Makoto Sakuda, A. L. Stachyra, Y. Kanaya, S. Nakayama, W. R. Kropp, N. Sakurai, Masayuki Nakahata, R. A. Doyle, M. Takita, M. L. Chen, S. Matsuno, P. G. Halverson, Akira Hasegawa, K. Martens, K. Fujita, Y. Watanabe, Frederick Reines, R. Sanford, L. R. Price, J. Shirai, W. Gajewski, Kate Scholberg, Osamu Sasaki, M. Kohama, Todd Haines, E. Sharkey, R. J. Wilkes, M. Goldhaber, Takashi Yamaguchi, C. McGrew, Yoshihiro Suzuki, C. Mauger, K. K. Young, S. Mine, C. K. Jung, M. Takahata, D. Kielczewska, J. S. George, Michael B. Smy, E. Ichihara, J. A. Goodman, A. Okada, J. Hill, J. W. Flanagan, Hiroshi Ogawa, M. Nemoto, E. Blaufuss, Kazumasa Miyano, A. T. Suzuki, A. Sakai, Takehisa Hasegawa, M. Etoh, T. Hayakawa, K. Ishihara, K. S. Ganezer, G. W. Sullivan, John G. Learned, H. Okazawa, W. Doki, T. Futagami, T. Barszczxak, R. W. Ellsworth, M. D. Messier, S. Tasaka, Masatoshi Koshiba, S. Echigo, Yuichi Oyama, F. Tsushima, Minoru Yoshida, C. Yanagisawa, A. Kibayashi, Yohei Kobayashi, Y. Nagashima, M. Miura, Ko Okumura, B. K. Kim, Kunio Inoue, K. Nishikawa, A. Suzuki, R. Svoboda, C. W. Walter, Soo-Bong Kim, S. Kasuga, Y. Fukuda, Y. Takeuchi, Shinya Yamada, Z. Conner, Masato Shiozawa, Lawrence Sulak, Junichi Kanzaki, Y. Hayato, T. Iwamoto, Yusuke Koshio, E. Kearns, K. Kaneyuki, C. Saji, J. L. Stone, W. E. Keig, and Mark R. Vagins
Subjects: Physics, Particle physics, Muon, Bilepton, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, General Physics and Astronomy, Solar neutrino problem, High Energy Physics - Experiment, Nuclear physics, Neutrino detector, K2K experiment, High Energy Physics::Experiment, Neutrino, Neutrino oscillation, Super-Kamiokande
Abstract: We present an analysis of atmospheric neutrino data from a 33.0 kiloton-year (535-day) exposure of the Super-Kamiokande detector. The data exhibit a zenith angle dependent deficit of muon neutrinos which is inconsistent with expectations based on calculations of the atmospheric neutrino flux. Experimental biases and uncertainties in the prediction of neutrino fluxes and cross sections are unable to explain our observation. The data are consistent, however, with two-flavor nu_mu nu_tau oscillations with sin^2(2theta)>0.82 and 5x10^-4 < delta m^2 < 6x10^-3 eV^2 at 90% confidence level., Comment: 9 pages (two-column) with 4 figures. Small corrections to Eqn.4 and Fig.3. Final version to appear in PRL
Published: 1998

70. Large-scale anisotropy of the cosmic-ray muon flux in Kamiokande

Author: Yuichi Oyama, M. Takita, S. Kasuga, Y. Fukuda, A. T. Suzuki, Y. Totsuka, Akito Sakai, H. Okazawa, M. Koshiba, S. Hatakeyama, K. Kihara, T. Kumita, Takayuki Suzuki, T. Horiuchi, E. Ichihara, Yasunari Suzuki, K. Matsumoto, Y. Takeuchi, T. Tomoeda, K. S. Hirata, Ko Okumura, Masayuki Nakahata, T. Yamaguchi, J. Suzuki, Y. Hayato, T. Hara, T. Suda, C. Kato, T. Ishizuka, Yusuke Koshio, Takaaki Kajita, H. Ishino, Kunio Inoue, S. Yasue, Masaki Mori, Toru Tanimori, Kyoshi Nishijima, K. Ishihara, M. Koga, K. Fujita, K. Kaneyuki, K. Nishikawa, S. Miyamoto, Kazuoki Munakata, Kazumasa Miyano, K. Nakamura, T. Hayakawa, S. Joukou, Shigeki Tasaka, T. Kiuchi, Masato Shiozawa, A. Suzuki, Tomoyuki Maruyama, Y. Nagashima, and S. Mori
Subjects: Physics, Astrophysics and Astronomy, Nuclear and High Energy Physics, Particle physics, Muon, Physics::Instrumentation and Detectors, Cherenkov detector, Astrophysics::High Energy Astrophysical Phenomena, Isotropy, Astrophysics::Instrumentation and Methods for Astrophysics, Scale (descriptive set theory), Cosmic ray, Astrophysics, law.invention, Amplitude, law, High Energy Physics::Experiment, Ultra-high-energy cosmic ray, Anisotropy
Abstract: The large-scale anisotropy of cosmic-ray primaries in the celestial coordinate was studied using cosmic-ray muons recorded in a large water Cherenkov detector, Kamiokande. The right-ascension distribution of the muon arrival directions deviated from an isotropic distribution with a 2.8 standard deviation, and agreed well with the first harmonics with an amplitude of $(5.6\ifmmode\pm\else\textpm\fi{}1.9)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and a phase of $8.0\ifmmode^\circ\else\textdegree\fi{}\ifmmode\pm\else\textpm\fi{}19.1\ifmmode^\circ\else\textdegree\fi{}$. This is the deepest underground observation of the large-scale anisotropy of cosmic rays, and agrees with observations with other underground experiments and extensive air-shower array experiments.
Published: 1997
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71. Study of neutron background in the atmospheric neutrino sample in Kamiokande

Author: H. Okazawa, Tomoyuki Maruyama, Masaki Mori, S. Kasuga, Y. Fukuda, Y. Totsuka, A. Suzuki, A.T. Suzuki, Toru Tanimori, K. Ishihara, Y. Takeuchi, K. Nishikawa, E. Ichihara, K. S. Hirata, J. Suzuki, Masato Shiozawa, T. Hara, T. Tomoeda, T. Ishizuka, K. Kaneyuki, M. Koshiba, Takaaki Kajita, H. Ishino, A. Sakai, Yuichi Oyama, Masayuki Nakahata, T. Suda, Ko Okumura, Kazumasa Miyano, Kunio Matsumoto, K. Nakamura, Y. Hayato, Kunio Inoue, S. Joukou, K. Fujita, Shigeki Tasaka, Kyoshi Nishijima, T. Hayakawa, Toshiharu Suzuki, Yusuke Koshio, S. Hatakeyama, K. Kihara, T. Kumita, T. Horiuchi, Y. Nagashima, M. Koga, Yasunari Suzuki, M. Takita, Takashi Yamaguchi, and S. Miyamoto
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Neutrino detector, Astrophysics::High Energy Astrophysical Phenomena, Neutron, Atmospheric neutrino, Neutrino, Nuclear Experiment, Neutrino oscillation, Neutron contamination, Sample (graphics)
Abstract: Neutron background in the atmospheric neutrino sample was studied based on the vertex position distribution of the fully contained π 0 events. No evidence for the background contamination was observed. The neutron contamination in the sub-GeV e-like sample was less than 1.2% at 90% C.L.
Published: 1996
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72. Very High Energy Gamma-ray Observations of AGN with CANGAROO

Author: Kyoshi Nishijima
Subjects: Astroparticle physics, Physics, PKS 2155-304, Active galactic nucleus, Astronomy, Astronomy and Astrophysics, Quasar, Cosmic ray, Astrophysics, Galaxy, law.invention, Telescope, Space and Planetary Science, law, Zenith
Abstract: We have observed eight AGN since 1993 in the energy region above several hundred GeV using the CANGAROO telescopes. We observed Mrk 421 for ten nights with the CANGAROO-II 10 m telescope during its active state in early 2001 using the very large zenith angle technique. Our preliminary result implies the detection of gamma-ray emission from Mrk 421 in the energy range above 9.3 TeV. The high energy peaked BL Lacs (HBLs) PKS 2005–489 and PKS 2155–304 have been also observed. No statistically significant signals are found for both HBLs and flux upper limits are obtained. A summary of results of observations of AGN is presented in this paper.
Published: 2002
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73. CANGAROO-III observation of TeV gamma rays from the unidentified gamma-ray source HESS J1614-518

Author: Y. Yukawa, Michiko Ohishi, Yutaka Matsubara, Shigeto Kabuki, Ken'ichi Tsuchiya, Ryoji Enomoto, Fuyuki Tokanai, Takanori Yoshikoshi, Hiroshi Muraishi, R. Kiuchi, Shuichi Gunji, Y. Yokoe, Toru Tanimori, S. Hayashi, H. Ishioka, S. Ryoki, Y. Mizumura, Philip G. Edwards, I. Matsuzawa, Shinji Hara, M. Akimoto, Hideaki Katagiri, D. L. Swaby, Y. Otake, Kazunori Nakayama, T. Matoba, S. Yanagita, A. Kawachi, G. J. Thornton, K. Saito, Hidetoshi Kubo, Takeshi Nakamori, Geoffrey V. Bicknell, Kyoshi Nishijima, Y. Mizumoto, T. Mizukami, Victor Stamatescu, Masaki Mori, Tsuguya Naito, Toshikazu Suzuki, F. Kajino, Roger W Clay, Tatsuo Yoshida, Y. Toyota, Tadashi Kifune, Y. Sakamoto, T. Kunisawa, J. Kushida, and T. Hara
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Photon, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Galactic plane, Cherenkov Telescope Array, Pulsar wind nebula, Stars, Pulsar, Space and Planetary Science, Astrophysics::Solar and Stellar Astrophysics, High Energy Physics::Experiment, Supernova remnant, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics::Galaxy Astrophysics
Abstract: We report the detection, with the CANGAROO-III imaging atmospheric Cherenkov telescope array, of a very high energy gamma-ray signal from the unidentified gamma-ray source HESS J1614-518, which was discovered in the H.E.S.S. Galactic plane survey. Diffuse gamma-ray emission was detected above 760 GeV at the 8.9 sigma level during an effective exposure of 54 hr from 2008 May to August. The spectrum can be represented by a power-law: 8.2+-2.2_{stat}+-2.5_{sys}x10^{-12}x (E/1TeV)^{-Gamma} cm^{-2} s^{-1} TeV^{-1} with a photon index Gamma of 2.4+-0.3_{stat}+-0.2_{sys}, which is compatible with that of the H.E.S.S. observations. By combining our result with multi-wavelength data, we discuss the possible counterparts for HESS J1614-518 and consider radiation mechanisms based on hadronic and leptonic processes for a supernova remnant, stellar winds from massive stars, and a pulsar wind nebula. Although a leptonic origin from a pulsar wind nebula driven by an unknown pulsar remains possible, hadronic-origin emission from an unknown supernova remnant is preferred., 9 pages, 7 figures, accepted for publication in ApJ
Published: 2011

74. Study of invisible nucleon decay, n→νν, and a forbidden nuclear transition in the Kamiokande detector

Author: Hiroshi Yokoyama, T. Kajumura, K. S. Hirata, Hiroyasu Ejiri, Kazumasa Miyano, A. Suzuki, Nobuaki Sato, Takaaki Kajita, A. Sakai, Toru Tanimori, Takanori Ishida, Kunio Inoue, Y. Fukuda, Miho Yamada, K. Kaneyuki, M. Koshiba, Masayuki Nakahata, E. Kodera, Y. Takeuchi, Y. Oyama, M. Takita, T. Suda, Y. Nagashima, K. Nakamura, Masaki Mori, K. Kihara, Kasuke Takahashi, H. Miyata, Y. Totsuka, A.T. Suzuki, H. Takei, Yasunari Suzuki, and Kyoshi Nishijima
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Range (particle radiation), Branching fraction, Cherenkov detector, law, Detector, Life time, Limit (mathematics), Nucleon, Lower limit, law.invention
Abstract: A search was made for anomalous γ-rays in the energy range 19 and 50 MeV in the large underground water Cherenkov detector Kamiokande. We found no significant excess above the known backgrounds. The result was used to set a limit on invisible nucleon decay through n→ν μ ν μ ν μ , n→ν e ν e ν e and n→ν τ ν τ ν τ . A lower limit on the partial life time τB is given by τB/Br(γ)=1.8×1031 yr(90% CL), where Br(γ)=Γγ/Γtot is the branching fraction of the γ-decay to the particle emission of the deexcitation of 15O∗. The life time limit becomes τB=4.9×1026 yr(90% CL) for a conservative estimate of Br(γ)=2.7×10−5 assuming a nuclear single particle model. The result was also used for studying forbidden transitions in the 16O nucleus. The limit for the relative strength of the forbidden transition to the normal transition is
Published: 1993
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75. Atmospheric neutrino oscillation analysis with sub-leading effects in Super-Kamiokande I, II, and III

Author: Masato Shiozawa, Y. Choi, S. Hazama, Masashi Yokoyama, Tsuyoshi Nakaya, C. Regis, K. Nishikawa, C. K. Jung, Hirokazu Ishino, N. Tanimoto, Shoei Nakayama, Atsumu Suzuki, N. Tamura, D. Kielczewska, Y. Takeuchi, David William Casper, Y. Watanabe, J. S. Jang, K. Sakashita, R. J. Wilkes, E. Kearns, I. T. Lim, Yuichi Oyama, Takaaki Kajita, G. D. Lopez, H. Nishino, Y. Yokosawa, Yasuhiro Shimizu, Masatoshi Koshiba, J. L. Stone, Y. Totsuka, T. Nakadaira, Y. Obayashi, H. Ogawa, C. Yanagisawa, Hiroshi Watanabe, Song Chen, Makoto Sakuda, M. Goldhaber, K. Abe, W. R. Kropp, K. S. Ganezer, C. W. Walter, K. Nakamura, Yoshitaka Itow, S. Yamada, S. B. Kim, Y. Kozuma, T. Iida, J. Y. Kim, Kyoshi Nishijima, Michael Litos, Huaqiao Zhang, E. Thrane, Ko Okumura, H. Toyota, K. Connolly, A. Kibayashi, Hiroyuki Sekiya, Mark R. Vagins, Y. Fukuda, Atsushi Takeda, H. Okazawa, Masayuki Nakahata, T. McLachlan, C. Ishihara, K. Ueshima, G. Mitsuka, Shigetaka Moriyama, S. Mine, Zishuo Yang, Kate Scholberg, W. Wang, John Hill, H. Kaji, A. Minamino, T. Tsukamoto, M. Fechner, H. W. Sobel, K. Kaneyuki, T. Sekiguchi, M. Ikeda, J. G. Learned, S. Tasaka, B. S. Yang, K. Bays, W. E. Keig, M. Dziomba, Toshiyuki Tanaka, Y. Heng, T. Ishida, Tsutomu Yokozawa, Yasunari Suzuki, Takehisa Hasegawa, Minoru Yoshida, Ken-ichiro Kobayashi, Frédéric Dufour, T. Kobayashi, J. Kameda, L. R. Sulak, T. Ishizuka, Y. Takenaga, M. Miura, J. L. Raaf, Koh Ueno, Yusuke Koshio, Michael B. Smy, C. McGrew, Y. Hayato, P. Mijakowski, S. Matsuno, T. Ishii, Justin Albert, Y. Kuno, S. Mino, R. A. Wendell, K. Iyogi, J. P. Cravens, and T. Mori
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Oscillation, FOS: Physical sciences, Fermion, High Energy Physics - Experiment, Massless particle, High Energy Physics - Experiment (hep-ex), Neutrino, Atmospheric neutrino, Neutrino oscillation, Super-Kamiokande, Lepton
Abstract: We present a search for non-zero theta_{13} and deviations of sin^2 theta_{23} from 0.5 in the oscillations of atmospheric neutrino data from Super-Kamiokande -I, -II, and -III. No distortions of the neutrino flux consistent with non-zero theta_{13} are found and both neutrino mass hierarchy hypotheses are in agreement with the data. The data are best fit at Delta m^2 = 2.1 x 10^-3 eV^2, sin^2 theta_{13} = 0.0, and sin^2 theta_{23} =0.5. In the normal (inverted) hierarchy theta_{13} and Delta m^2 are constrained at the one-dimensional 90% C.L. to sin^2 theta_{13} < 0.04 (0.09) and 1.9 (1.7) x 10^-3 < Delta m^2 < 2.6 (2.7) x 10^-3 eV^2. The atmospheric mixing angle is within 0.407, 17 Pages, 14 figures. To be submitted to Phys. Rev. D Minor update to text after referee comments. Figures modified for better grayscale printing.
Published: 2010

76. A limit on massive neutrino dark matter from Kamiokande

Author: Hiroshi Yokoyama, M. Koshiba, T. Suda, Kyoshi Nishijima, Y. Oyama, K. Nakamura, E. W. Beier, Y. Nagashima, Y. Totsuka, K. Kihara, K. S. Hirata, Takanori Ishida, Weiya Zhang, H. Takei, Yasunari Suzuki, Nobuaki Sato, Takaaki Kajita, Mihoko M. Nojiri, W. Frati, Y. Fukuda, Miho Yamada, Soo-Bong Kim, A. Sakai, Masaki Mori, Kazumasa Miyano, E. D. Frank, R. Van Berg, H. Miyata, E. Kodera, Y. Takeuchi, Ken Ichi Hikasa, Masayuki Nakahata, A. Suzuki, F. M. Newcomer, T. Kajimura, A.K. Mann, K. Inoue, K. Takahashi, Toru Tanimori, K. Kaneyuki, and M. Takita
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Underground Xenon experiment, Solar neutrino, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Solar neutrino problem, Neutrino detector, Warm dark matter, High Energy Physics::Experiment, Neutrino, Neutrino oscillation, Light dark matter
Abstract: We have searched for possible high-energy neutrino signals expected from massive neutrino dark matter captured by the earth and the sun, by making use of upward-going muon samples collected in the seven years of operation of the Kamiokande detector. No excess of events was found from the earth or the sun, thus giving an excluded mass range of Dirac-(Majorana-) type neutrinos, 6 (24) ⩽ m ν ⩽ several hundred GeV, as the dark matter which consitutes the halo of the galaxy. The upper bounds extend to a mass range never before analyzed in previous indirect searches.
Published: 1992
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77. Survey of atmospheric neutrino data and implications for neutrino mass and mixing

Author: Kasuke Takahashi, Miho Yamada, Toru Tanimori, E. D. Frank, Kazumasa Miyano, Weiya Zhang, A. Suzuki, M. Takita, R. Van Berg, K. Kaneyuki, Y. Takeuchi, W. Frati, M. Koshiba, Nobuaki Sato, Hiroshi Yokoyama, K. Nakamura, Y. Yaginuma, Takaaki Kajita, E. W. Beier, Y. Fukuda, S. Ohara, A. Sakai, T. Kajimura, Masayuki Nakahata, T. Suda, Masaki Mori, H. Miyata, H. Takei, Yasunari Suzuki, K. S. Hirata, Soo-Bong Kim, Yuichi Oyama, E. Kodera, Y. Totsuka, K. Kihara, F. M. Newcomer, K. Inoue, A.K. Mann, Y. Nagashima, Kyoshi Nishijima, Takanori Ishida, and T. Tajima
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, High Energy Physics::Phenomenology, Solar neutrino problem, Nuclear physics, Neutrino detector, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Neutrino astronomy, Neutrino oscillation, Lepton
Abstract: A detailed comparison is made of the atmospheric neutrino results obtained by the Frejus, IMB-3, and Kamiokande detectors. The implications of these results for vacuum neutrino oscillations are presented, and juxtaposed with the results for matter neutrino oscillations from the solar neutrino data.
Published: 1992
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78. Observation of a small atmospheric vμ/ve ratio in Kamiokande

Author: K. Nakamura, E. W. Beier, K. S. Hirata, Nobuaki Sato, Takaaki Kajita, E. D. Frank, Y. Takeuchi, Weiya Zhang, M. Koshiba, Hiroshi Yokoyama, Masayuki Nakahata, H. Takei, Yasunari Suzuki, F. M. Newcomer, A. Suzuki, Kunio Inoue, T. Suda, Kasuke Takahashi, Kyoshi Nishijima, Toru Tanimori, Y. Fukuda, Kazumasa Miyano, T. Tajima, A.K. Mann, A. Sakai, Soo-Bong Kim, Y. Yaginuma, H. Miyata, K. Kaneyuki, Y. Totsuka, K. Kihara, Y. Nagashima, Masaki Mori, Takanori Ishida, S. Ohara, M. Takita, E. Kodera, Yuichi Oyama, T. Kajimura, Miho Yamada, R. Van Berg, and W. Frati
Subjects: Physics, Particle scattering, Nuclear physics, Nuclear and High Energy Physics, Particle physics, High Energy Physics::Experiment, Elementary particle, Astrophysics::Earth and Planetary Astrophysics, Neutrino, Atmospheric neutrino, Neutrino oscillation, Flux ratio, Charged current
Abstract: Results are presented of the observation of atmospheric neutrino interactions in the Kamiokande detector in an exposure of 4.92 kt yr. The observed ratio of single ring μ-events to e-events ( μ e ) data ( μ e ) MC = 0.60 +007 −0.06 ( stat. ) ± 0.05 ( syst. ) suggests that the atmospheric vμ/ve ratio is smaller than expected. The implications of these results for neutrino oscillations are discussed.
Published: 1992
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79. A limit on spontaneous R parity breaking from Kamiokande

Author: T. Suda, Mihoko M. Nojiri, Y. Yaginuma, T. Kajimura, K. S. Hirata, Y. Totsuka, Nobuaki Sato, Kyoshi Nishijima, Takaaki Kajita, Kazumasa Miyano, Masayuki Nakahata, K. Nakamura, Miho Yamada, Y. Nagashima, H. Takei, M. Takita, Masaki Mori, Toru Tanimori, Yasunari Suzuki, Y. Fukuda, K. Kihara, Y. Oyama, K. Kaneyuki, M. Koshiba, T. Tajima, Takanori Ishida, E. Kodera, A. Suzuki, K. Inoue, Kasuke Takahashi, and H. Miyata
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Supersymmetry, Nuclear physics, Particle decay, R-parity, Neutralino, High Energy Physics::Experiment, Symmetry breaking, Neutrino, Lepton
Abstract: If R parity is not an exact symmetry in supersymmetric theories, the lightest supersymmetric partner, most favorably the neutralino, would not be stable, but may decay to produce energetic neutrinos. We show that a lack of excess neutrino events above the atmospheric neutrino background, obtained from upward-going muon data in Kamiokande, places a severe constraint on models of R parity breaking if the neutralino is a dark-matter particle.
Published: 1992
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80. Kinematic reconstruction of atmospheric neutrino events in a large water Cherenkov detector with proton identification

Author: K. Kaneyuki, K. Ueshima, T. Nakadaira, T. Sekiguchi, Takaaki Tanaka, W. Wang, Lawrence Sulak, Robert Svoboda, J. S. Jang, K. Abe, C. McGrew, Y. Takeuchi, H. Nishino, R. J. Wilkes, A. Minamino, T. Tsukamoto, R. A. Wendell, Ken-ichiro Kobayashi, G. Mitsuka, Kimihiro Okumura, David William Casper, Masatoshi Koshiba, Y. Obayashi, Yusuke Koshio, S. Matsuno, T. Ishii, E. Thrane, Michael Litos, H. Ogawa, Frédéric Dufour, I. T. Lim, Y. Fukuda, K. Sakashita, Huaqiao Zhang, N. Tanimoto, J. Kameda, B. S. Yang, I. Higuchi, Masayuki Nakahata, Y. Idehara, Takashi Kobayashi, Song Chen, K. Bayes, Shigeki Tasaka, S. Moriyama, T. Iida, T. Hasegawa, S. Mine, C. Ishihara, E. Kearns, Yuichi Oyama, Makoto Sakuda, A. Suzuki, Masashi Yokoyama, T. Ishida, M. B. Smy, Yoshihiro Suzuki, Hiroshi Watanabe, M. Goldhaber, Y. Furuse, M. Vagins, J. L. Stone, C. Regis, K. S. Ganezer, C. K. Jung, M. Fechner, Yoshinari Hayato, H. Okazawa, Y. Totsuka, D. Kielczewska, C. W. Walter, J. G. Learned, Y. Kuno, N. Tamura, Y. Watanabe, Zishuo Yang, C. Yanagisawa, Kate Scholberg, S. Nakayama, J. Y. Kim, Tsuyoshi Nakaya, Takaaki Kajita, S. Dazeley, Koji Nakamura, G. D. Lopez, Y. Yokosawa, J. P. Cravens, K. Ueno, Atsushi Takeda, T. Ishizuka, Hiroyuki Sekiya, Soo-Bong Kim, M. Miura, J. L. Raaf, R. Terri, Minoru Yoshida, M. Ikeda, Masato Shiozawa, Y. Choi, H. Seo, S. Hazama, Y. Takenaga, W. R. Kropp, Y. Heng, K. Nishikawa, Henry W. Sobel, Kyoshi Nishijima, Yoshitaka Itow, S. Yamada, John Hill, and W. E. Keig
Subjects: Physics, Nuclear and High Energy Physics, Sterile neutrino, Particle physics, Neutral current, Proton, Physics::Instrumentation and Detectors, Cherenkov detector, High Energy Physics::Phenomenology, High Energy Physics - Experiment, law.invention, Nuclear physics, law, High Energy Physics::Experiment, Neutrino, Neutrino oscillation, Cherenkov radiation, Lepton
Abstract: We report the development of a proton identification method for the Super-Kamiokande detector. This new tool is applied to the search for events with a single proton track, a high purity neutral current sample of interest for sterile neutrino searches. After selection using a neural network, we observe 38 events in the combined SK-I and SK-II data corresponding to 2285.1 days of exposure, with an estimated signal to background ratio of 1.6 to 1. Proton identification was also applied to a direct search for charged-current quasi-elastic (CCQE) events, obtaining a high precision sample of fully kinematically reconstructed atmospheric neutrinos, which has not been previously reported in water Cherenkov detectors. The CCQE fraction of this sample is 55%, and its neutrino (as opposed to anti-neutrino) fraction is 91.7+/-3%. We selected 78 mu-like and 47 e-like events in the SK-I and SK-II data set. With this data, a clear zenith angle distortion of the neutrino direction itself is reported in a sub-GeV sample of muon neutrinos where the lepton angular correlation to the incoming neutrino is weak. Our fit to nu_mu->nu_tau oscillations using the neutrino L/E distribution of the CCQE sample alone yields a wide acceptance region compatible with our previous results and excludes the no-oscillation hypothesis at 3 sigma., Comment: 23 pages, 22 figures. Corrected typos, replaced some figures. Version accepted for publication in Phys. Rev. D
Published: 2009
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81. Accelerator Beam Experiments of a PrototypeCosmic Ray Heavy Ion Telescope

Author: T. Kohno, T. Imai, Jun Kikuchi, Nobuyuki Hasebe, Hank Crawford, Kazuoki Munakata, Akira Yoneda, M. Matsuoka, T. Doke, T. Kashiwagi, Chihiro Kato, and Kyoshi Nishijima
Subjects: Physics, Solar energetic particles, Isotope, Astrophysics::High Energy Astrophysical Phenomena, General Physics and Astronomy, Cosmic ray, law.invention, Nuclear physics, Telescope, Full width at half maximum, Synchronous orbit, law, Nuclide, Nuclear Experiment, Beam (structure)
Abstract: A Heavy Ion cosmic ray Telescope (HIT) has been scheduled to be launched into the synchronous orbit in 1993 aiming to observe elemental and isotopic composition of solar energetic particles and galactic cosmic rays. In this paper, we report the results of accelerator beam experiments of a prototype model of HIT. The telescope consists of two dimensional Position Sensitive Detectors (PSDs) and energy loss detectors (PIN type and Li-drifted type). The mass resolution was 1.1 amu in FWHM for 110 MeV/n pure iron ( 56 Fe) beam. By exposing HIT to beams consisting of various nuclides produced by the projectile fragmentation process in a reaction induced by 56 Fe beam, we confirmed that the secondary elements from 16 S to 25 Mn were clearly separated and that also the isotopes were separated for each elements lighter than 22 Ti. The observed mass resolution was 0.57 amu, 0.66 amu and 0.82 amu in FWHM for 18 Ar, 20 Ca and 22 Ti, respectively. We can conclude that the HIT has good prospects of enough ability for o...
Published: 1991
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82. Search for neutralino dark matter in Kamiokande

Author: Kazumasa Miyano, K. Nakamura, Yuichi Oyama, Y. Totsuka, E. W. Beier, K. S. Hirata, K. Kahara, Weiya Zhang, H. Miyata, M. Koshiba, R. Van Berg, Toru Tanimori, A. Suzuki, K. Kaneyuki, Mihoko M. Nojiri, Soo-Bong Kim, E. Kodera, W. Frati, Nobuaki Sato, Takaaki Kajita, H. Takei, Yasunari Suzuki, F. M. Newcomer, Kyoshi Nishijima, Miho Yamada, Kasuke Takahashi, Y. Fukuda, M. Takita, T. Tajima, Takanori Ishida, Y. Yaginuma, Y. Nagashima, Masaki Mori, A.K. Mann, E. D. Frank, K. Inoue, Masayuki Nakahata, and T. Suda
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Dark matter, Astrophysics::Cosmology and Extragalactic Astrophysics, Supersymmetry, Astrophysics, Lightest Supersymmetric Particle, Neutralino, Warm dark matter, High Energy Physics::Experiment, Neutrino, Light dark matter, Minimal Supersymmetric Standard Model
Abstract: A search has been made for upward-going muons in the Kamiokande detector as a possible signal from neutralino dark matter captured in the earth. We found the upward-going muon flux from the earth is consistent with that produced by the atmospheric neutrinos. Assuming the galactic halo contains neutralino dark matter, this result provides limits on the neutralino mass in the region 30–80 GeV and gives stringent constraints on the allowed regions of the parameter space in the framework of the minimal supersymmetric standard model.
Published: 1991
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83. Present status of the 7–10 m telescope of CANGAROO II

Author: Shohei Yanagita, H. Muraishi, Yasushi Muraki, J. R. Patterson, M. Moriya, A. Yuki, Takanori Yoshikoshi, A. Kawachi, Kyoshi Nishijima, R. Susukita, Yoshihiko Mizumoto, S. Le Bohec, Masaki Mori, Tsuguya Naito, Jamie Holder, Tadashi Kifune, J. Jimbo, T. Hara, T. Tamura, Hidetoshi Kubo, Shuichi Gunji, Yutaka Matsubara, Gavin Rowell, Shinji Hara, Toru Tanimori, Tatsuo Yoshida, S. A. Dazeley, M. D. Roberts, J. Kushida, and K. Sakurazawa
Subjects: Physics, Aperture, Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, law.invention, Telescope, law, Sky, Astrophysics::Galaxy Astrophysics, Cherenkov radiation, media_common
Abstract: The Cherenkov telescope of the CANGAROO II project will start operation in 1999 in Woomera, South Australia, with a 7 m aperture using 60 plastic mirrors. The telescope, which can potentially be extended to a 10 m aperture, will be used to observe gamma-ray sources with an energy threshold of the order of 100 GeV in the southern sky.
Published: 1999
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84. TeV observations of Centaurus A

Author: Yasushi Muraki, Hiroshi Muraishi, Tadashi Kifune, M. D. Roberts, Shuichi Gunji, Jamie Holder, Tatsuo Yoshida, S. Yanagita, T. Hara, Toru Tanimori, Takanori Yoshikoshi, S. A. Dazeley, Shoichi Ogio, R. Susukita, T. Tamura, J. R. Patterson, Tsuguya Naito, Gavin Rowell, Masaki Mori, Yoshihiko Mizumoto, Philip G. Edwards, Yutaka Matsubara, Takashi Sako, K. Sakurazawa, Kyoshi Nishijima, A. Kawachi, and G. J. Thornton
Subjects: Physics, Photon, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Centaurus A, FOS: Physical sciences, Flux, Astronomy and Astrophysics, Astrophysics, Radius, law.invention, Telescope, law, High Energy Physics::Experiment
Abstract: We have searched for TeV gamma-rays from Centaurus A and surrounding region out to +/- 1.0 deg using the CANGAROO 3.8m telescope. No evidence for TeV gamma-ray emission was observed from the search region, which includes a number of interesting features located away from the tracking centre of our data. The 3 sigma upper limit to the flux of gamma-rays above 1.5 TeV from an extended source of radius 14' centred on Centaurus A is 1.28e-11 photons cm^-2 s^-1., 4 pages. Astroparticle Physics, accepted for publication. Some upper limits overestimated by factor 2-4 in original version astro-ph/9901316. Now corrected
Published: 1999
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85. Solar neutrino measurements in Super-Kamiokande-II

Author: D. Kielczewska, Y. Watanabe, I. Kato, M. Sugihara, K. S. Ganezer, K. Ueshima, Y. Totsuka, H. Okazawa, Y. Takeuchi, W. Wang, T. Koike, Michael B. Smy, H. Seo, Shinya Yamada, Masatoshi Koshiba, R. Terri, T. Ishizuka, T. Sato, J. L. Raaf, R. W. Ellsworth, M. Ishitsuka, Atsushi Takeda, Toshiyuki Tanaka, Atsumu Suzuki, Alec Habig, N. Tanimoto, Mark R. Vagins, R. A. Wendell, Shantanu Desai, S. Matsuno, E. Kearns, H. Maesaka, Yueh-Feng Liu, Katsuki Hiraide, J. Dunmore, David William Casper, T. Kato, C. Mitsuda, K. Nitta, Shaomin Chen, Kyoshi Nishijima, Hiroshi Sato, Hirokazu Ishino, C. Saji, Shigetaka Moriyama, T. Iida, H. Nishino, Takaaki Kajita, Y. Gando, J. S. Jang, A. K. Ichikawa, Haruki Watanabe, A. L. Stachyra, W. R. Kropp, K. Nishikawa, K. K. Shiraishi, K. Nakamura, G. Guillian, G. Mitsuka, T. Nakadaira, C. Ishihara, M. Goldhaber, T. Iwashita, Makoto Sakuda, Shoei Nakayama, I. Higuchi, H. Ishii, Frédéric Dufour, Masayuki Nakahata, Y. Idehara, Shigeki Tasaka, K. Kaneyuki, N. Tamura, S. Dazeley, J. P. Cravens, J. L. Stone, C. W. Walter, T. J. Haines, M. Ikeda, H. W. Sobel, J. Y. Kim, Yasunari Suzuki, Michael Litos, Magdalena Malek, Lawrence Sulak, C. McGrew, S. Clark, Y. Hayato, S. Likhoded, S. Mine, Y. Kuno, Shoji Yamamoto, Masashi Yokoyama, A. Minamino, R. Svoboda, E. Thrane, Y. Obayashi, Yusuke Koshio, M. Fechner, D. W. Liu, Hiroyuki Sekiya, Soo-Bong Kim, Y. Fukuda, Kate Scholberg, Tsuyoshi Nakaya, J. Yoo, Ko Okumura, Masato Shiozawa, Y. Choi, Hiroshi Ogawa, Kunio Inoue, Takehisa Hasegawa, T. Kobayashi, D. Turcan, K. Ishihara, Yuichi Oyama, K. Abe, T. Ishii, R. J. Wilkes, I. T. Lim, C. Yanagisawa, B. S. Yang, T. Ishida, Y. Furuse, M. D. Messier, H. G. Berns, Takanori Sasaki, John G. Learned, A. Sarrat, G. W. Sullivan, Yoshitaka Itow, John Hill, Katsuhiro Kobayashi, W. E. Keig, J. Kameda, Minoru Yoshida, Zhi Deng, Y. Takenaga, Masaya Hasegawa, M. Miura, K. Washburn, S. Hatakeyama, R. Gran, C. Regis, and C. K. Jung
Subjects: Physics, Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, Phase (waves), Solar cycle 23, Flux, Astrophysics, Spectral line, Solar cycle, High Energy Physics - Experiment, Nuclear physics, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Neutrino oscillation, Super-Kamiokande
Abstract: The results of the second phase of the Super-Kamiokande solar neutrino measurement are presented and compared to the first phase. The solar neutrino flux spectrum and time variation as well as oscillation results are statistically consistent with the first phase and do not show spectral distortion. The time-dependent flux measurement of the combined first and second phases coincides with the full period of solar cycle 23 and shows no correlation with solar activity. The measured {sup 8}B total flux is (2.38{+-}0.05(stat.){sub -0.15}{sup +0.16}(sys.))x10{sup 6} cm{sup -2} s{sup -1} and the day-night difference is found to be (-6.3{+-}4.2(stat.){+-}3.7(sys.))%. There is no evidence of systematic tendencies between the first and second phases.
Published: 2008

86. Search for Matter-Dependent Atmospheric Neutrino Oscillations in Super-Kamiokande

Author: S. Yamada, Haruki Watanabe, N. Tamura, Y. Gando, E. Thrane, Y. Fukuda, Y. Takeuchi, K. Abe, C. McGrew, M. Sugihara, Koji Nakamura, Kate Scholberg, T. Iida, N. Tanimoto, Masayuki Nakahata, S. Clark, Makoto Sakuda, S. Moriyama, Kimihiro Okumura, C. Regis, M. B. Smy, R. J. Wilkes, B. S. Yang, Henry W. Sobel, Yoshitaka Itow, Shaomin Chen, Kyoshi Nishijima, T. Ishii, J. L. Stone, J. Dunmore, Y. Furuse, M. D. Messier, R. A. Wendell, Yoshihiro Suzuki, C. Yanagisawa, J. Y. Kim, A. Suzuki, Masashi Yokoyama, C. Saji, Y. Totsuka, T. Ishizuka, C. W. Walter, Alec Habig, C. K. Jung, D. Kielczewska, R. Svoboda, M. Ikeda, H. G. Berns, Lawrence Sulak, T. Ishida, K. Kaneyuki, K. Ueshima, John Hill, T. Sato, J. L. Raaf, M. Goldhaber, Yuichi Oyama, Y. Idehara, B. Hartfield, K. S. Ganezer, H. Seo, S. Nakayama, Masatoshi Koshiba, Kunio Inoue, W. Wang, Tsuyoshi Nakaya, Shigeki Tasaka, R. Terri, T. Koike, Hiroyuki Sekiya, A. Sarrat, H. Okazawa, S. Dazeley, Soo-Bong Kim, S. Matsuno, H. Ishii, Masato Shiozawa, Y. Choi, K. Nishikawa, Y. Obayashi, H. Nishino, Yusuke Koshio, Toshiyuki Tanaka, W. E. Keig, Y. Watanabe, Yoshinari Hayato, Atsushi Takeda, G. Mitsuka, Shantanu Desai, W. R. Kropp, Frédéric Dufour, M. Miura, Yueh-Feng Liu, T. Kato, H. Tanaka, A. Minamino, I. T. Lim, G. Guillian, David William Casper, E. Kearns, H. Ogawa, I. Higuchi, K. K. Shiraishi, C. Ishihara, S. Likhoded, Minoru Yoshida, Y. Kuno, J. P. Cravens, I. S. Jeong, M. Vagins, John G. Learned, Katsuhiro Kobayashi, J. Kameda, Takaaki Kajita, T. J. Haines, Michael Litos, D. W. Liu, Zhi Deng, Y. Takenaga, Takashi Kobayashi, T. Nakadaira, J. S. Jang, T. Hasegawa, S. Mine, and M. Fechner
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Electron density, Muon, Oscillation, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Context (language use), High Energy Physics - Experiment, Nuclear physics, High Energy Physics::Experiment, Neutrino, Super-Kamiokande, Neutrino oscillation, Mixing (physics)
Abstract: We consider muon neutrino to tau neutrino oscillations in the context of the Mass Varying Neutrino (MaVaN) model, where the neutrino mass can vary depending on the electron density along the flight path of the neutrino. Our analysis assumes a mechanism with dependence only upon the electron density, hence ordinary matter density, of the medium through which the neutrino travels. Fully-contained, partially-contained and upward-going muon atmospheric neutrino data from the Super--Kamiokande detector, taken from the entire SK--I period of 1489 live days, are compared to MaVaN model predictions. We find that, for the case of 2-flavor oscillations, and for the specific models tested, oscillation independent of electron density is favored over density dependence. Assuming maximal mixing, the best-fit case and the density-independent case do not differ significantly., Comment: 6 pages, 1 figure
Published: 2008

87. First Study of Neutron Tagging with a Water Cherenkov Detector

Author: Minoru Yoshida, Shoei Nakayama, Y. Totsuka, T. Tsukamoto, T. Ishii, Michael Litos, K. Ueshima, Zhi Deng, W. R. Kropp, Y. Takenaga, Yuichi Oyama, C. McGrew, S. Clark, B. S. Yang, T. Ishida, M. Miura, Y. Idehara, Y. Hayato, R. Wendel, Y. Furuse, S. Yamada, W. Wang, Y. Takeuchi, N. Tanimoto, J. Y. Kim, Shigeki Tasaka, S. Dazeley, T. Nakadaira, T. Iida, I. Higuchi, K. Abe, H. W. Sobel, K. Sakashita, T. Xue, S. Mine, Lawrence Sulak, G. Guillian, Makoto Sakuda, R. J. Wilkes, Haruki Watanabe, C. Regis, C. K. Jung, D. Kielczewska, I. T. Lim, H. Nishino, M. Fechner, M. Goldhaber, Y. Watanabe, G. Gong, A. Sarrat, I. S. Jeong, Atsumu Suzuki, C. Yanagisawa, N. Tamura, Masato Shiozawa, Y. Choi, Todd Haines, C. W. Walter, M. D. Messier, Shaomin Chen, T. Kobayashi, Y. Yokosawa, Kyoshi Nishijima, E. Kearns, Y. Obayashi, J. L. Stone, Yusuke Koshio, S. Hazama, David William Casper, R. Gran, J. S. Jang, Koji Nakamura, Shigetaka Moriyama, H. Ogawa, Hiroyuki Sekiya, Atsushi Takeda, H. G. Berns, M. Ikeda, Soo-Bong Kim, Y. Fukuda, Masashi Yokoyama, R. Svoboda, Shantanu Desai, J. Griskevich, Masayuki Nakahata, Takehisa Hasegawa, J. G. Learned, Michael B. Smy, Alec Habig, Yueh-Feng Liu, Tsuyoshi Nakaya, H. Seo, Ken-ichiro Kobayashi, Yoshitaka Itow, J. Kameda, K. K. Shiraishi, G. Mitsuka, Mark R. Vagins, Hirokazu Ishino, C. Ishihara, Frédéric Dufour, John Hill, W. E. Keig, R. Terri, A. Minamino, K. S. Ganezer, D. W. Liu, E. Thrane, H. Okazawa, Kate Scholberg, K. Ueno, A. K. Ichikawa, K. Kaneyuki, T. Sekiguchi, K. Bays, Takaaki Tanaka, Yasunari Suzuki, J. Dunmore, K. Nishikawa, Ko Okumura, A. Kibayashi, J. P. Cravens, S. Likhoded, Y. Kuno, S. Matsuno, Takaaki Kajita, Masatoshi Koshiba, Huaqiao Zhang, T. Ishizuka, and J. L. Raaf
Subjects: Physics, Cherenkov detector, Physics::Instrumentation and Detectors, Detector, FOS: Physical sciences, Astronomy and Astrophysics, Photon energy, Coincidence, Neutron temperature, law.invention, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), law, Neutron, High Energy Physics::Experiment, Cherenkov radiation
Abstract: A first study of neutron tagging is conducted in Super--Kamiokande, a 50,000-ton water Cherenkov detector. The tagging efficiencies of thermal neutrons are evaluated in a 0.2 % GdCl$_{3}$-water solution and pure water. They are determined to be, respectively, 66.7 % for events above 3 MeV and 20 % with corresponding background probabilities of 2 $\times$ 10$^{-4}$ and 3 $\times$ 10$^{-2}$. This newly developed technique may enable water Cherenkov detectors to identify $\bar \nu_{e}$'s geological or astrophysical sources as well as those produced by commercial reactors via the delayed coincidence scheme., Comment: 17 pages, 11 figures
Published: 2008
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88. VERY HIGH ENERGY γ -RAYS FROM THE UNIVERSE’S MIDDLE AGE: DETECTION OF THE z = 0.940 BLAZAR PKS 1441+25 WITH MAGIC

Author: M. Pesce Rollins, Lluis Font, Francesco Longo, Abelardo Moralejo, I. Snidaric, Thomas Bretz, M. Feige, E. Moretti, Mosè Mariotti, A.-K. Overkemping, M. Makariev, D. Wolfert, E. Lorenz, Max Ludwig Ahnen, S. Haarto, P. Giammaria, T. Steinbring, S. Maldera, F. de Palma, D. Dominis Prester, Nicola Omodei, Marcel Strzys, P. Haeusner, R. Clavero, W. Bednarek, Fabrizio Tavecchio, R. Reinthal, R. Zanin, Elina Lindfors, D. Nakajima, Daniela Dorner, Adrian Biland, P. G. Prada Moroni, R. A. Cameron, M. Gaug, M. Caragiulo, Johan Bregeon, Saverio Lombardi, Kyoshi Nishijima, Arka Chatterjee, D. Fidalgo, U. Barres de Almeida, Damir Lelas, J. Kushida, Daniel Mazin, Igor V. Moskalenko, Olaf Reimer, Julie McEnery, Anne Lähteenmäki, Hiromitsu Takahashi, Julian Sitarek, A. López Oramas, J. Herrera, Wolfgang Rhode, J. Rico, J. Klamt, Dorota Sobczyńska, Jose Luis Contreras, Hiroyasu Tajima, X. Paredes Fortuny, Koji Noda, J. Li, A. Niedzwiecki, Masahiro Teshima, P. Bruel, E. Orlando, Yusuke Konno, T. Toyama, E. Recillas, V. Fallah Ramazani, Elisa Bernardini, K. S. Wood, Carmelo Sgrò, Riccardo Rando, Nikola Godinovic, T. Ohsugi, Eleonora Troja, Juan Cortina, D. J. Thompson, F. Di Pierro, Benito Marcote, P. Fusco, E. Colombo, Stefano Ansoldi, Ievgen Vovk, Oscar Blanch, N. Zottmann, E. Hays, Talvikki Hovatta, Riccardo Paoletti, M. Razzano, Ivica Puljak, E. Nuss, David Paneque, C. Delgado Mendez, Filippo D'Ammando, F. Piron, Pierre Colin, B. De Lotto, Stefano Covino, A. De Angelis, Luigi Pacciani, A. Treves, Vitaly Neustroev, T. Schweizer, M. Kuss, R. Bonino, J. Palacio, R. Mirzoyan, I. A. Grenier, P. Temnikov, Stefano Ciprini, E. de Oña Wilhelmi, Nestor Mirabal, P. Da Vela, L. Carrasco, Marcello Giroletti, L. O. Takalo, D. Guberman, M. I. Martínez, J. M. Paredes, E. Cavazzuti, M. Mayer, Juri Poutanen, S. Rainò, Antonio Stamerra, F. Borracci, Tsunefumi Mizuno, Y. Hanabata, A. González Muñoz, G. Maneva, Marina Manganaro, P. Spinelli, S. Bonnefoy, Kari Nilsson, T. A. Porter, Gloria Spandre, J. Hose, P. Antoranz, Tomoki Saito, D. Tescaro, D. Galindo, U. Menzel, E. Prandini, M. Will, G. Chiaro, Marco Ajello, J. B. Thayer, Merja Tornikoski, F. Loparco, Markus Garczarczyk, Francesco Giordano, B. Banerjee, Sabrina Einecke, D. Elsaesser, J. W. Hewitt, R. Desiante, D. Garrido Terrats, A. Fernández Barral, Diego F. Torres, James Chiang, H. Takami, M. Palatiello, S. Buson, Alessandro Carosi, J. Rodriguez Garcia, P. Lubrano, Mislav Baloković, A. Carraminana, Konstancja Satalecka, A. Sillanpää, L. Di Venere, Dario Gasparrini, Michele Doro, Roger Blandford, Vassil Verguilov, Roopesh Ojha, L. Maraschi, Francesco Dazzi, Ana Babić, Gareth Hughes, F. Spada, Julia Thaele, Tomislav Terzić, A. Porras, M. E. Monzani, A. Morselli, Jose Miguel Miranda, G. A. Caliandro, A. Reimer, W. Idec, A. Hahn, E. Carmona, Stefan Larsson, J. Kania, M. Hayashida, Wu M. H., Steven N. Shore, C. Lorey, Marc Ribó, P. Bangale, E. J. Siskind, Hidetoshi Kubo, Dario Hrupec, M. A. Lopez, G. Bonnoli, F. Gargano, K. Mallot, R. J. García López, R. Lopez Coto, Massimo Persic, V. H. Chavushyan, Liang Li, Guido Barbiellini, J. León Tavares, Pratik Majumdar, M. V. Fonseca, K. Kodani, Reiko Orito, Aaron Dominguez, Juan Abel Barrio, Luca Baldini, J. E. Ward, Sylvain Guiriec, Mn Mazziotta, Christian Fruck, J. S. Perkins, Nicola Giglietto, B. Biasuzzi, M. N. Lovellette, P. A. Caraveo, J. Becerra González, Elisabetta Bissaldi, G. Pivato, Andrei Berdyugin, T. Jogler, Ronaldo Bellazzini, C. Schultz, Louis Antonelli, K. Frantzen, Denis Bastieri, S. Paiano, Karl Mannheim, A. La Barbera, D. Eisenacher Glawion, M. Nievas Rosillo, Universitat de Barcelona, Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire Univers et Particules de Montpellier (LUPM), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), ITA, USA, GBR, FRA, DEU, ESP, AFG, ALB, DZA, AND, AGO, BGR, BFA, BDI, KHM, CMR, CAN, CPV, CS, TCD, CYM, COD, CHL, TWN, CYP, VAT, COL, COM, COG, PRK, KOR, CIV, DOM, CCK, CRI, HRV, CUB, DNK, DMA, ECU, EGY, SLV, ARE, CHN, ERI, AIA, EST, ETH, FJI, PHL, FIN, GAB, GMB, GAZA, ZAF, GEO, COK, GHA, JAM, JPN, GIB, DJI, JOR, GRC, REU, GRD, GRL, GLP, FRO, GUM, GTM, GIN, GNB, GNQ, GUI, ROU, GUY, GUF, HTI, HND, FLK, HKG, IND, IDN, IRN, MNP, RWA, MHL, MUS, UMI, SLB, TCA, VIR, ATA, VGB, ISR, KAZ, RUS, KGZ, KIR, SCG, KWT, LAO, LSO, LVA, ATG, LBN, LBR, ESH, LBY, LIE, LTU, LUX, MAC, MKD, MDG, MWI, ANT, MDV, AUS, MYS, MLI, MLT, MAR, MTQ, MRT, MYT, MEX, MDA, SAU, IRQ, MCO, MNG, MSR, MOZ, MMR, NAM, NRU, NPL, NIC, NER, KNA, ARG, NGA, NIU, NOR, NCL, NZL, OMN, NLD, PAK, PLW, SPM, PAN, ARM, PNG, PRY, PER, PCN, PYF, POL, PRI, PRT, VCT, QAT, CZE, ABW, CAF, ASM, WSM, SMR, LCA, SHN, STP, SEN, IRL, AUT, SYC, SLE, SGP, SYR, SVK, SVN, SOM, LKA, ISL, FSM, AZE, SGS, SDN, SUR, SJM, SWE, CHE, SWZ, TJK, BVT, TZA, IOT, BHS, ATF, PSE, THA, TLS, TGO, TKL, TON, MAN, TTO, TUN, TUR, BHR, TKM, TUV, UKR, UGA, HUN, URY, CXR, UZB, VUT, VEN, VNM, BGD, WLF, YEM, ZMB, ZWE, BRB, HMD, BEL, BLZ, BEN, BMU, BTN, BLR, BOL, BIH, BWA, BRA, NFK, BRN, Ahnen, M. L., Ansoldi, S., Antonelli, L. A., Antoranz, P., Babic, A., Banerjee, B., Bangale, P., De Almeida, U. Barre, Barrio, J. A., Bednarek, W., Bernardini, E., Biasuzzi, B., Biland, A., Blanch, O., Bonnefoy, S., Bonnoli, G., Borracci, F., Bretz, T., Carmona, E., Carosi, A., Chatterjee, A., Clavero, R., Colin, P., Colombo, E., Contreras, J. L., Cortina, J., Covino, S., Da Vela, P., Dazzi, F., De Angelis, A., De Lotto, B., De Oña Wilhelmi, E., Mendez, C. Delgado, Di Pierro, F., Prester, D. Domini, Dorner, D., Doro, M., Einecke, S., Glawion, D. Eisenacher, Elsaesser, D., Fernández Barral, A., Fidalgo, D., Fonseca, M. V., Font, L., Frantzen, K., Fruck, C., Galindo, D., López, R. J. García, Garczarczyk, M., Terrats, D. Garrido, Gaug, M., Giammaria, P., Godinović, N., Muñoz, A. González, Guberman, D., Hahn, A., Hanabata, Y., Hayashida, M., Herrera, J., Hose, J., Hrupec, D., Hughes, G., Idec, W., Kodani, K., Konno, Y., Kubo, H., Kushida, J., La Barbera, A., Lelas, D., Lindfors, E., Lombardi, S., López, M., López Coto, R., López Oramas, A., Lorenz, E., Majumdar, P., Makariev, M., Mallot, K., Maneva, G., Manganaro, M., Mannheim, K., Maraschi, L., Marcote, B., Mariotti, M., Martínez, M., Mazin, D., Menzel, U., Miranda, J. M., Mirzoyan, R., Moralejo, A., Moretti, E., Nakajima, D., Neustroev, V., Niedzwiecki, A., Rosillo, M. Nieva, Nilsson, K., Nishijima, K., Noda, K., Orito, R., Overkemping, A., Paiano, S., Palacio, J., Palatiello, M., Paneque, D., Paoletti, R., Paredes, J. M., Paredes Fortuny, X., Persic, M., Poutanen, J., Moroni, P. G. Prada, Prandini, E., Puljak, I., Rhode, W., Ribó, M., Rico, J., Garcia, J. Rodriguez, Saito, T., Satalecka, K., Schultz, C., Schweizer, T., Shore, S. N., Sillanpää, A., Sitarek, J., Snidaric, I., Sobczynska, D., Stamerra, A., Steinbring, T., Strzys, M., Takalo, L., Takami, H., Tavecchio, F., Temnikov, P., Terzić, T., Tescaro, D., Teshima, M., Thaele, J., Torres, D. F., Toyama, T., Treves, A., Verguilov, V., Vovk, I., Ward, J. E., Will, M., Wu, M. H., Zanin, R., Ajello, M., Baldini, L., Barbiellini, G., Bastieri, D., González, J. Becerra, Bellazzini, R., Bissaldi, E., Blandford, R. D., Bonino, R., Bregeon, J., Bruel, P., Buson, S., Caliandro, G. A., Cameron, R. A., Caragiulo, M., Caraveo, P. A., Cavazzuti, E., Chiang, J., Chiaro, G., Ciprini, S., D'Ammando, F., De Palma, F., Desiante, R., Di Venere, L., Domínguez, A., Fusco, P., Gargano, F., Gasparrini, D., Giglietto, N., Giordano, F., Giroletti, M., Grenier, I. A., Guiriec, S., Hays, E., Hewitt, J. W., Jogler, T., Kuss, M., Larsson, S., Li, J., Li, L., Longo, Francesco, Loparco, F., Lovellette, M. N., Lubrano, P., Maldera, S., Mayer, M., Mazziotta, M. N., Mcenery, J. E., Mirabal, N., Mizuno, T., Monzani, M. E., Morselli, A., Moskalenko, I. V., Nuss, E., Ojha, R., Ohsugi, T., Omodei, N., Orlando, E., Perkins, J. S., Pesce Rollins, M., Piron, F., Pivato, G., Porter, T. A., Raino, S., Rando, R., Razzano, M., Reimer, A., Reimer, O., Sgro, C., Siskind, E. J., Spada, F., Spandre, G., Spinelli, P., Tajima, H., Takahashi, H., Thayer, J. B., Thompson, D. J., Troja, E., Wood, K. S., Balokovic, M., Berdyugin, A., Carraminana, A., Carrasco, L., Chavushyan, V., Ramazani, V. Fallah, Feige, M., Haarto, S., Haeusner, P., Hovatta, T., Kania, J., Klamt, J., Lähteenmäki, A., Leon Tavares, J., Lorey, C., Pacciani, L., Porras, A., Recillas, E., Reinthal, R., Tornikoski, M., Wolfert, D., Zottmann, N., Ahnen ML, Ansoldi S, Antonelli LA, Antoranz P, Babic A, Banerjee B, Bangale P, De Almeida UB, Barrio JA, Bednarek W, Bernardini E, Biasuzzi B, Biland A, Blanch O, Bonnefoy S, Bonnoli G, Borracci F, Bretz T, Carmona E, Carosi A, Chatterjee A, Clavero R, Colin P, Colombo E, Contreras JL, Cortina J, Covino S, Da Vela P, Dazzi F, De Angelis A, De Lotto B, Wilhelmi ED, Mendez CD, Di Pierro F, Prester DD, Dorner D, Doro M, Einecke S, Glawion DE, Elsaesser D, Fernandez-Barral A, Fidalgo D, Fonseca MV, Font L, Frantzen K, Fruck C, Galindo D, Lopez RJG, Garczarczyk M, Terrats DG, Gaug M, Giammaria P, Godinovic N, Munoz AG, Guberman D, Hahn A, Hanabata Y, Hayashida M, Herrera J, Hose J, Hrupec D, Hughes G, Idec W, Kodani K, Konno Y, Kubo H, Kushida J, La Barbera A, Lelas D, Lindfors E, Lombardi S, Lopez M, Lopez-Coto R, Lopez-Oramas A, Lorenz E, Majumdar P, Makariev M, Mallot K, Maneva G, Manganaro M, Mannheim K, Maraschi L, Marcote B, Mariotti M, Martinez M, Mazin D, Menzel U, Miranda JM, Mirzoyan R, Moralejo A, Moretti E, Nakajima D, Neustroev V, Niedzwiecki A, Rosillo M, Nilsson K, Nishijima K, Noda K, Orito R, Overkemping A, Paiano S, Palacio J, Palatiello M, Paneque D, Paoletti R, Paredes JM, Paredes-Fortuny X, Persic M, Poutanen J, Moroni PGP, Prandini E, Puljak I, Rhode W, Ribo M, Rico J, Garcia JR, Saito T, Satalecka K, Schultz C, Schweizer T, Shore SN, Sillanpaa A, Sitarek J, Snidaric I, Sobczynska D, Stamerra A, Steinbring T, Strzys M, Takalo L, Takami H, Tavecchio F, Temnikov P, Terzic T, Tescaro D, Teshima M, Thaele J, Torres DF, Toyama T, Treves A, Verguilov V, Vovk I, Ward JE, Will M, Wu MH, Zanin R, Ajello M, Baldini L, Barbiellini G, Bastieri D, Gonzalez JB, Bellazzini R, Bissaldi E, Blandford RD, Bonino R, Bregeon J, Bruel P, Buson S, Caliandro GA, Cameron RA, Caragiulo M, Caraveo PA, Cavazzuti E, Chiang J, Chiaro G, Ciprini S, DAmmando F, de Palma F, Desiante R, Di Venere L, Dominguez A, Fusco P, Gargano F, Gasparrini D, Giglietto N, Giordano F, Giroletti M, Grenier IA, Guiriec S, Hays E, Hewitt JW, Jogler T, Kuss M, Larsson S, Li J, Li L, Longo F, Loparco F, Lovellette MN, Lubrano P, Maldera S, Mayer M, Mazziotta MN, McEnery JE, Mirabal N, Mizuno T, Monzani ME, Morselli A, Moskalenko IV, Nuss E, Ojha R, Ohsugi T, Omodei N, Orlando E, Perkins JS, Pesce-Rollins M, Piron F, Pivato G, Porter TA, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Sgro C, Siskind EJ, Spada F, Spandre G, Spinelli P, Tajima H, Takahashi H, Thayer JB, Thompson DJ, Troja E, Wood KS, Balokovic M, Berdyugin A, Carraminana A, Carrasco L, Chavushyan V, Ramazani VF, Feige M, Haarto S, Haeusner P, Hovatta T, Kania J, Klamt J, Lahteenmaki A, Leon-Tavares J, Lorey C, Pacciani L, Porras A, Recillas E, Reinthal R, Tornikoski M, Wolfert D, and Zottmann N
Subjects: individual (PKS 1441+25) [quasars], cosmic background radiation, Astrophysics, 7. Clean energy, Raigs gamma, Jets (Astrofísica), galaxies: active, galaxies: jets, gamma rays: galaxies, quasars: individual (PKS 1441+25), MAGIC (telescope), Space and Planetary Science, Astronomy and Astrophysics, ComputingMilieux_MISCELLANEOUS, astro-ph.HE, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Extragalactic background light, active [galaxies], Spectral energy distribution, Electrónica, Física nuclear, Electricidad, Astrophysics - High Energy Astrophysical Phenomena, astro-ph.GA, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], cosmic background radiation – galaxies: active – galaxies: jets – gamma rays: galaxies – quasars: individual (PKS 1441+25), galaxie [gamma rays], Blazar, Quasars, Quàsars, Gamma rays, Quasar, Astrophysics - Astrophysics of Galaxies, Redshift, Galaxy, Astrophysical jets, jet [galaxies], 13. Climate action, Astrophysics of Galaxies (astro-ph.GA), Galàxies actives, Active galaxies, ddc:520, Fermi Gamma-ray Space Telescope
Abstract: The flat-spectrum radio quasar PKS 1441+25 at a redshift of z = 0.940 is detected between 40 and 250 GeV with a significance of 25.5 {\sigma} using the MAGIC telescopes. Together with the gravitationally lensed blazar QSO B0218+357 (z = 0.944), PKS 1441+25 is the most distant very high energy (VHE) blazar detected to date. The observations were triggered by an outburst in 2015 April seen at GeV energies with the Large Area Telescope on board Fermi. Multi-wavelength observations suggest a subdivision of the high state into two distinct flux states. In the band covered by MAGIC, the variability time scale is estimated to be 6.4 +/- 1.9 days. Modeling the broadband spectral energy distribution with an external Compton model, the location of the emitting region is understood as originating in the jet outside the broad line region (BLR) during the period of high activity, while being partially within the BLR during the period of low (typical) activity. The observed VHE spectrum during the highest activity is used to probe the extragalactic background light at an unprecedented distance scale for ground-based gamma-ray astronomy., Comment: Corresponding Authors: J. Becerra (josefa.becerra@nasa.gov), M. Nievas Rosillo (mnievas@ucm.es), M. Manganaro (manganaro@iac.es), F. Tavecchio (fabrizio.tavecchio@brera.inaf.it) Published in The Astrophysical Journal Letters (ApJL), 2015ApJ...815L..23A, DOI: 10.1088/2041-8205/815/2/L23
Published: 2015
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89. A Measurement of Atmospheric Neutrino Flux Consistent with Tau Neutrino Appearance

Author: K. Kaneyuki, W. R. Kropp, R. J. Wilkes, Y. Takeuchi, Yasunari Suzuki, G. Mitsuka, I. T. Lim, T. Iwashita, Takaaki Kajita, I. Higuchi, Henry W. Sobel, K. Nitta, T. Nakadaira, Kyoshi Nishijima, A. K. Ichikawa, Michael Litos, Frédéric Dufour, M. Ishitsuka, S. B. Kim, J. Y. Kim, Atsushi Takeda, J. Kameda, Makoto Sakuda, A. Minamino, Shigetaka Moriyama, H. Ishii, Atsumu Suzuki, Shantanu Desai, Minoru Yoshida, K. Nakamura, N. Tamura, C. Regis, M. Sugihara, Y. Totsuka, C. K. Jung, Shoei Nakayama, Yuichi Oyama, J. L. Stone, D. Kielczewska, E. Kearns, T. Ishii, D. W. Liu, M. Malek, Y. Gando, C. McGrew, S. Clark, J. P. Cravens, K. Ishihara, J. Hill, K. S. Ganezer, Yusuke Koshio, I. Kato, Masayuki Nakahata, Y. Watanabe, C. Yanagisawa, H. Okazawa, Y. Takenaga, Mark R. Vagins, Masaya Hasegawa, M. Miura, C. W. Walter, J. S. Jang, K. Abe, L. R. Sulak, C. Saji, J. Zalipska, K. Nishikawa, T. Iida, Y. Obayashi, K. Ueshima, T. Sato, J. Yoo, E. Guillian, T. Ishida, Masato Shiozawa, Y. Choi, M. Goldhaber, David William Casper, R. A. Wendell, C. Mitsuda, H. Ogawa, S. Mine, W. Wang, J. G. Learned, Todd Haines, T. Koike, Kate Scholberg, Yoshitaka Itow, G. W. Sullivan, M. D. Messier, T. Kobayashi, K. K. Shiraishi, Y. Fukuda, C. Ishihara, K. Washburn, Katsuhiro Kobayashi, T. Ishizuka, Masashi Yokoyama, R. Svoboda, S. Hatakeyama, R. Gran, J. L. Raaf, Ko Okumura, H. G. Berns, R. W. Ellsworth, Tsuyoshi Nakaya, Takehisa Hasegawa, Hirokazu Ishino, R. Terri, Masatoshi Koshiba, Kunio Inoue, S. Likhoded, Y. Kuno, Takanori Sasaki, T. Kato, A. Sarrat, Michael B. Smy, H. Seo, W. E. Keig, N. Tanimoto, H. Maesaka, Hiroshi Sato, H. Nishino, Shigeki Tasaka, S. Dazeley, Y. Hayato, Alec Habig, S. Matsuno, and Shoji Yamamoto
Subjects: Physics, Quantum chromodynamics, Particle physics, Tamura, Norio, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, General Physics and Astronomy, Flux, High Energy Physics - Experiment, Nuclear physics, Angular distribution, Tau neutrino, 田村, 詔生, High Energy Physics::Experiment, Atmospheric neutrino, Neutrino, Neutrino oscillation, Charged current
Abstract: A search for the appearance of tau neutrinos from \mutau oscillations in the atmospheric neutrinos has been performed using 1489.2 days of atmospheric neutrino data from the Super-Kamiokande-I experiment. A best fit tau neutrino appearance signal of 138 $\pm$ 48 (stat.) $^{+15}_{-32}$ (sys.) events is obtained with an expectation of 78 $\pm$ 26 (sys.). The hypothesis of no tau neutrino appearance is disfavored by 2.4 sigma., Comment: 5 pages, 3 figures, 3 tables, submitted to PRL
Published: 2006

90. Three flavor neutrino oscillation analysis of atmospheric neutrinos in Super-Kamiokande

Author: T. Nakadaira, Masatoshi Koshiba, J. P. Cravens, Makoto Sakuda, C. Yanagisawa, S. Mine, Takanori Sasaki, R. A. Wendell, C. McGrew, S. Clark, Yusuke Koshio, T. Kobayashi, Mark R. Vagins, Y. Hayato, S. Likhoded, M. Goldhaber, Yuichi Oyama, Shoji Yamamoto, Yoshitaka Kuno, David William Casper, C. Mitsuda, Toshio Namba, Y. Totsuka, J. Hosaka, T. J. Haines, D. Turcan, H. Maesaka, M. Ishitsuka, Atsushi Takeda, Hiroshi Sato, T. Kato, K. Ishihara, Alec Habig, K. Washburn, Shantanu Desai, K. Nakamura, W. R. Kropp, T. Ishizuka, K. Kaneyuki, S. Matsuno, T. Ishii, K. K. Shiraishi, H. Nishino, J. Shirai, T. Iwashita, Jodi Cooley, I. Higuchi, Hirokazu Ishino, J. A. Goodman, E. Blaufuss, Y. Gando, A. L. Stachyra, Shigeki Tasaka, Masayuki Nakahata, S. Dazeley, R. W. Ellsworth, Yasunari Suzuki, C. Regis, C. K. Jung, J. S. Jang, R. J. Wilkes, I. T. Lim, Takaaki Kajita, D. Kielczewska, I. Kato, A. Sarrat, S. B. Kim, J. Y. Kim, Y. Obayashi, L. R. Sulak, M. D. Messier, S. Hatakeyama, R. Gran, C. Mauger, Yoshitaka Itow, T. Sato, A. Suzuki, A. Okada, Masashi Yokoyama, R. Svoboda, H. G. Berns, Tsuyoshi Nakaya, J. Zalipska, J. Yoo, T. Ishida, Masato Shiozawa, Y. Choi, J. G. Learned, W. E. Keig, G. W. Sullivan, Katsuhiro Kobayashi, Minoru Yoshida, Takehisa Hasegawa, Y. Takenaga, Masaya Hasegawa, M. Miura, C. W. Walter, A. Kibayashi, J. Kameda, C. W. Sterner, Henry W. Sobel, K. Nitta, Kyoshi Nishijima, Michael B. Smy, H. Seo, Shigetaka Moriyama, Shoei Nakayama, Kate Scholberg, J. Hill, Y. Fukuda, Y. Takeuchi, Shinya Yamada, N. Tamura, J. L. Stone, W. Wang, A. K. Ichikawa, Atsumu Suzuki, E. Kearns, C. Saji, Y. Watanabe, G. Mitsuka, K. S. Ganezer, H. Okazawa, E. Guillian, A. Minamino, D. W. Liu, M. Malek, Ko Okumura, Kunio Inoue, and K. Nishikawa
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Neutrino detector, Invariant mass, Weinberg angle, High Energy Physics::Experiment, Neutrino, Super-Kamiokande, Mass hierarchy, Neutrino oscillation, Particle identification, High Energy Physics - Experiment
Abstract: We report on the results of a three-flavor oscillation analysis using Super-Kamiokande~I atmospheric neutrino data, with the assumption of one mass scale dominance ($\Delta m_{12}^2$$=$0). No significant flux change due to matter effect, which occurs when neutrinos propagate inside the Earth for $\theta_{13}$$\neq$0, has been seen either in a multi-GeV $\nu_e$-rich sample or in a $\nu_\mu$-rich sample. Both normal and inverted mass hierarchy hypotheses are tested and both are consistent with observation. Using Super-Kamiokande data only, 2-dimensional 90 % confidence allowed regions are obtained: mixing angles are constrained to $\sin^2\theta_{13} < 0.14$ and $0.37 < \sin^2\theta_{23} < 0.65$ for the normal mass hierarchy. Weaker constraints, $\sin^2\theta_{13} < 0.27$ and $0.37 < \sin^2\theta_{23} < 0.69$, are obtained for the inverted mass hierarchy case., Comment: 7 figures, 3 tables
Published: 2006

91. Search for TeV Gamma-Rays from 3EG J1234-1318 with the CANGAROO-II Telescope

Author: T. Hattori and Kyoshi Nishijima
Subjects: Physics, Structure formation, biology, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Astronomy, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, biology.organism_classification, Cosmology, Galaxy, law.invention, Telescope, law, Egret, Astrophysics::Galaxy Astrophysics
Abstract: We observed 3EG J1234-1318 with the CANGAROO-II telescope in March, 2002. This source is a steady unidentified EGRET gamma-ray source at high Galactic latitude which has been associated with a dynamically merging clusters of galaxies, and is therefore a candidate TeV source. TeV gamma-ray emission is also expected as a result of large-scale cosmological structure formation. We here report the resulting upper limit on the TeV gamma-ray emission from 3EG J1234-1318.
Published: 2005
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92. Observation of the Anisotropy of 10 TeV Primary Cosmic Ray Nuclei Flux with the Super-Kamiokande-I Detector

Author: C. W. Walter, M. Ishitsuka, Atsushi Takeda, D. Turcan, Shantanu Desai, Y. Fukuda, K. Ishihara, K. Washburn, C. Yanagisawa, Y. Totsuka, W. Wang, J. L. Stone, T. Nakadaira, G. Mitsuka, S. Hatakeyama, R. Gran, Atsumu Suzuki, A. L. Stachyra, Michael B. Smy, Makoto Sakuda, G. Guillian, H. Okazawa, John Hill, E. Kearns, Masatoshi Koshiba, J. Griskevich, Y. Takeuchi, Shinya Yamada, Alec Habig, A. K. Ichikawa, S. Matsuno, Minoru Yoshida, R. J. Wilkes, K. Nishikawa, T. Kobayashi, M. Goldhaber, J. Shirai, Shigeki Tasaka, E. Sharkey, S. Dazeley, David William Casper, C. Mitsuda, S. Mine, T. Ishizuka, Takehisa Hasegawa, Hirokazu Ishino, J. Hosaka, H. Ogawa, Y. Takenaga, Masaya Hasegawa, M. Miura, E. Blaufuss, Y. Watanabe, J. G. Learned, A. Suzuki, C. McGrew, R. W. Ellsworth, G. W. Sullivan, Yusuke Koshio, K. Nakamura, Y. Hayato, Masashi Yokoyama, Ko Okumura, T. Ishii, K. K. Shiraishi, Katsuhiro Kobayashi, Toshio Namba, R. Svoboda, Masayuki Nakahata, Kunio Inoue, S. B. Kim, H. Maesaka, Shoji Yamamoto, K. Kaneyuki, A. Minamino, Mark R. Vagins, Hiroshi Sato, D. W. Liu, L. R. Sulak, M. Malek, H. Nishino, Yasunari Suzuki, T. Kato, K. S. Ganezer, W. Gajewski, Kate Scholberg, Tsuyoshi Nakaya, Takaaki Kajita, J. Yoo, C. K. Jung, Masato Shiozawa, D. Kielczewska, A. Kibayashi, Y. Gando, I. Kato, J. Kameda, Y. Obayashi, W. R. Kropp, T. Iwashita, I. Higuchi, C. Saji, Todd Haines, M. D. Messier, C. Mauger, A. Okada, H. G. Berns, T. Ishida, H. W. Sobel, K. Nitta, Kyoshi Nishijima, Shigetaka Moriyama, Shoei Nakayama, Yuichi Oyama, W. E. Keig, J. A. Goodman, Yoshitaka Itow, and Kazuoki Munakata
Subjects: Physics, Nuclear and High Energy Physics, Muon, Detector, Astrophysics (astro-ph), Flux, Astronomy, FOS: Physical sciences, Cosmic ray, Astrophysics, High Energy Physics - Phenomenology, Amplitude, High Energy Physics - Phenomenology (hep-ph), Primary (astronomy), High Energy Physics::Experiment, Super-Kamiokande, Anisotropy
Abstract: The relative sidereal variation in the arrival direction of primary cosmic ray nuclei of median energy 10 TeV was measured using downward, through-going muons detected with the Super-Kamiokande-I detector. The projection of the anisotropy map onto the right ascension axis has a first harmonic amplitude of $(6.64 \pm 0.98 {stat.} \pm 0.55 {syst.}) \times 10^{-4}$ and a phase at maximum at $(33.2^\circ \pm 8.2^\circ {stat.} \pm 5.1^\circ {syst.})$ right ascension. A sky map in equatorial coordinates indicates an excess region in the constellation of Taurus and a deficit region toward Virgo. The excess region is centered at $(\alpha_T, \delta_T) = (75^\circ \pm 7^\circ, -5^\circ \pm 9^\circ)$ with a half opening angle $\chi_T = (39 \pm 7)^\circ$; the excess flux is ($0.104 \pm 0.020$)% above the isotropic expectation. The corresponding parameters for the deficit region are $(\alpha_V, \delta_V) = (205^\circ \pm 7^\circ, 5^\circ \pm 10^\circ)$, $\chi_V = (54 \pm 7)^\circ$, and $(-0.094 \pm 0.014)$%. The data do not allow us to rule out a pure dipole form for the anisotropy (allowed at 13% confidence level); they are better described by the excess and deficit cones described above. We explored the implications under the assumption that the true anisotropy is not distorted too much by the analysis filter so that it is well-described by the observed excess and deficit cones., Comment: 18 pages, 11 figures, submitted for publication in Phys. Rev. D
Published: 2005

93. Measurement of atmospheric neutrino oscillation parameters by Super-Kamiokande I

Author: G. Guillian, C. Yanagisawa, M. Goldhaber, A. K. Ichikawa, K. Kaneyuki, A. Minamino, Y. Watanabe, S. Mine, D. W. Liu, Atsumu Suzuki, S. Matsuno, E. Kearns, T. Toshito, Hirokazu Ishino, M. Ishitsuka, Y. Totsuka, A. Suzuki, C. W. Walter, Ko Okumura, R. Svoboda, D. Turcan, Shantanu Desai, Y. Nakajima, K. Ishihara, J. P. Cravens, Y. Ashie, C. McGrew, S. Clark, R. J. Wilkes, Tsuyoshi Nakaya, Kunio Inoue, Y. Hayato, K. Taki, T. Sasaki, C. Saji, J. Yoo, A. L. Stachyra, K. Nishikawa, I. T. Lim, Masato Shiozawa, A. Kibayashi, K. S. Ganezer, J. Kameda, Shoji Yamamoto, T. Kato, N. Tamura, L. R. Sulak, C. W. Sterner, E. Blaufuss, J. Shirai, Y. Fukuda, Magdalena Malek, J. L. Stone, E. Sharkey, S. Dazeley, Yoshitaka Itow, Takashi Kobayashi, K. Hayashi, Y. Gando, Yusuke Koshio, Koji Nakamura, Y. Takeuchi, K. Washburn, Mark R. Vagins, John G. Learned, T. Iwashita, H. Okazawa, S. Ueda, T. Maruyama, S. Likhoded, Shinya Yamada, R. Nambu, W. Wang, S. Hatakeyama, Y. Kuno, R. Gran, Kazumasa Miyano, Henry W. Sobel, K. Nitta, Michael B. Smy, H. Seo, Takehisa Hasegawa, Kyoshi Nishijima, J. A. Goodman, Alec Habig, W. R. Kropp, G. W. Sullivan, John Hill, C. K. Jung, D. Kielczewska, Shigetaka Moriyama, J. S. Jang, D. Takemori, Yuichi Oyama, I. Kato, Shoei Nakayama, Katsuhiro Kobayashi, Minoru Yoshida, Y. Obayashi, T. Harada, S. Tasaka, W. E. Keig, T. Ishii, W. Gajewski, Kate Scholberg, S. B. Kim, David William Casper, Masayuki Nakahata, C. Mitsuda, J. Hosaka, Y. Takenaga, Masaya Hasegawa, M. Miura, K. K. Shiraishi, Yoshihiro Suzuki, Masatoshi Koshiba, J. Ishii, J. Zalipska, T. Ishida, Makoto Sakuda, A. Sarrat, Todd Haines, M. D. Messier, C. Mauger, A. Okada, H. G. Berns, T. Ishizuka, Taichi Morita, R. W. Ellsworth, Takaaki Kajita, Y. Choi, J. Y. Kim, Toshio Namba, and H. Maesaka
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, High Energy Physics::Phenomenology, Monte Carlo method, High Energy Physics - Experiment, Nuclear physics, Neutrino detector, High Energy Physics::Experiment, Neutrino, Neutrino oscillation, Super-Kamiokande, Charged current, Energy (signal processing)
Abstract: We present a combined analysis of fully-contained, partially-contained and upward-going muon atmospheric neutrino data from a 1489 day exposure of the Super--Kamiokande detector. The data samples span roughly five decades in neutrino energy, from 100 MeV to 10 TeV. A detailed Monte Carlo comparison is described and presented. The data is fit to the Monte Carlo expectation, and is found to be consistent with neutrino oscillations of $\nu_\mu \leftrightarrow \nu_\tau$ with $\sin^22\theta > 0.92$ and $1.5\times 10^{-3} < \Delta m^2 < 3.4\times 10^{-3}{\rm eV}^2$ at 90% confidence level., Comment: 32 pages, 44 figures. As accepted for publication in Physical Review D
Published: 2005
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94. Limits on the Neutrino Magnetic Moment using 1496 Days of Super-Kamiokande-I Solar Neutrino Data

Author: G. Guillian, Atsumu Suzuki, K. Hayashi, C. McGrew, Y. Hayato, K. Nishikawa, T. J. Haines, E. Kearns, Toshio Namba, Y. Watanabe, John G. Learned, Y. Totsuka, S. B. Kim, J. L. Stone, T. Inagaki, Kenzo Nakamura, D. Takemori, Shoji Yamamoto, C. Saji, Yusuke Koshio, H. Maesaka, G. W. Sullivan, T. Toshito, M. Earl, M. Ishitsuka, C. K. Jung, D. Kielczewska, C. W. Walter, Katsuhiro Kobayashi, M. D. Messier, H. W. Sobel, T. Hashimoto, T. Ooyabu, Masayuki Nakahata, Takaaki Kajita, C. Mauger, Shantanu Desai, S. Ueda, Michael B. Smy, H. Seo, T. Maruyama, S. Fukuda, Yoshitaka Kuno, I. Kato, A. Okada, W. Wang, Y. Ashie, H. Okazawa, Kunio Inoue, Minoru Yoshida, M. Takita, J. Y. Kim, Mikio Morii, Takehisa Hasegawa, Yuichi Oyama, Y. Obayashi, K. S. Ganezer, K. Kaneyuki, R. Nishimura, Makoto Sakuda, Magdalena Malek, Y. Fukuda, A. K. Ichikawa, Hyosun Kim, T. Ishizuka, T. Shibata, J. Zalipska, K. Martens, S. Mine, A. Minamino, T. Sasaki, J. Kameda, Y. Takeuchi, Shinya Yamada, S. Matsuno, T. Ishida, Taichi Morita, R. W. Ellsworth, L. R. Sulak, M. Ackermann, T. Kobayashi, Y. Kajiyama, Masatoshi Koshiba, Yoshihiro Suzuki, D. W. Liu, B. Viren, Alec Habig, T. Kato, C. W. Sterner, A. Kibayashi, J. Ishii, J. A. Goodman, J. P. Cravens, E. Blaufuss, W. R. Kropp, W. Gajewski, Kate Scholberg, T. Iwashita, K. Nitta, Kyoshi Nishijima, D. Turcan, Hirokazu Ishino, Y. Nakajima, K. Ishihara, David William Casper, J. Shirai, Shigetaka Moriyama, Y. Nagashima, H. Takeuchi, Masaya Hasegawa, M. Miura, Nobuyuki Sakurai, Shoei Nakayama, K. K. Shiraishi, Shigeki Tasaka, E. Sharkey, S. Dazeley, K. Washburn, S. Hatakeyama, R. Gran, C. Mitsuda, Yoshitaka Itow, R. J. Wilkes, I. T. Lim, C. Yanagisawa, J. Yoo, Kazumasa Miyano, Masato Shiozawa, Y. Choi, T. Barszczak, J. Hill, Y. Gando, T. Ishii, R. Nambu, A. Suzuki, R. Svoboda, Tsuyoshi Nakaya, W. E. Keig, and Mark R. Vagins
Subjects: Physics, Particle physics, Magnetic moment, Physics::Instrumentation and Detectors, Solar neutrino, High Energy Physics::Phenomenology, General Physics and Astronomy, Electron, Solar neutrino problem, High Energy Physics - Experiment, Nuclear physics, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Super-Kamiokande, Neutrino oscillation
Abstract: A search for a non-zero neutrino magnetic moment has been conducted using 1496 live days of solar neutrino data from {\SK}. Specifically, we searched for distortions to the energy spectrum of recoil electrons arising from magnetic scattering due to a non-zero neutrino magnetic moment. In the absence of clear signal, we found $\mu_{\nu} \leq 3.6 \times 10^{-10}$ $\mu_{B}$ at 90% C.L. by fitting to the Super-Kamiokande day/night spectra. The fitting took into account the effect of neutrino oscillation on the shapes of energy spectra. With additional information from other solar neutrino and KamLAND experiments constraining the oscillation region, a limit of $\mu_{\nu} \leq 1.1 \times 10^{-10}$ $\mu_{B}$ at 90% C.L. was obtained., Comment: 5 pages, 4 figures
Published: 2004
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95. Evidence for an oscillatory signature in atmospheric neutrino oscillations

Author: Toshio Namba, J. Yoo, J. P. Cravens, Masato Shiozawa, Shantanu Desai, Atsumu Suzuki, W. Gajewski, Kate Scholberg, Y. Totsuka, H. Maesaka, T. Sasaki, E. Kearns, Mark R. Vagins, Y. Takeuchi, Shinya Yamada, E. Blaufuss, Y. Nagashima, Masaki Ishitsuka, A. L. Stachyra, J. Zalipska, C. McGrew, J. Shirai, A. Suzuki, Takaaki Kajita, R. Nishimura, Makoto Sakuda, Y. Hayato, K. Taki, R. Svoboda, G. Guillian, A. Kibayashi, E. Sharkey, S. Dazeley, Y. Watanabe, Hirokazu Ishino, L. R. Sulak, J. Kameda, Ko Okumura, C. Yanagisawa, S. Likhoded, Yoshitaka Itow, W. R. Kropp, Shoji Yamamoto, C. W. Walter, M. Goldhaber, C. Saji, Y. Kuno, M. Takita, Y. Ashie, C. W. Sterner, Tsuyoshi Nakaya, K. Nakamura, T. Toshito, K. Washburn, K. Hayashi, S. Mine, Kunio Inoue, S. Hatakeyama, R. Gran, Y. Gando, H. Okazawa, Tomoyuki Maruyama, T. Ooyabu, A. Minamino, T. Ishida, John G. Learned, H. W. Sobel, W. Wang, Masayuki Nakahata, T. Iwashita, K. Kaneyuki, Y. Fukuda, R. Nambu, A. Sarrat, D. W. Liu, T. Ishizuka, C. K. Jung, Alec Habig, S. Matsuno, S. Ueda, Minoru Yoshida, D. Takemori, D. Kielczewska, Magdalena Malek, Todd Haines, N. Tamura, Yasunari Suzuki, Y. Choi, M. D. Messier, K. Nishikawa, G. W. Sullivan, J. L. Stone, T. Inagaki, Kazumasa Miyano, Taichi Morita, R. W. Ellsworth, T. Kobayashi, C. Mauger, Takehisa Hasegawa, Masatoshi Koshiba, J. S. Jang, T. Ishii, A. Okada, I. Kato, H. G. Berns, Yusuke Koshio, John Hill, Michael B. Smy, Katsuhiro Kobayashi, J. Ishii, Y. Takenaga, H. Seo, Masaya Hasegawa, M. Miura, David William Casper, T. Harada, C. Mitsuda, R. J. Wilkes, Y. Obayashi, J. Hosaka, K. Nitta, S. Tasaka, W. E. Keig, S. B. Kim, Kyoshi Nishijima, J. Y. Kim, D. Turcan, I. T. Lim, Y. Nakajima, K. K. Shiraishi, K. Ishihara, T. Kato, Shigetaka Moriyama, Yuichi Oyama, J. A. Goodman, Shoei Nakayama, A. K. Ichikawa, and K. S. Ganezer
Subjects: Physics, Particle physics, Tamura, Norio, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, General Physics and Astronomy, High Energy Physics - Experiment, Distribution (mathematics), Measurements of neutrino speed, 田村, 詔生, High Energy Physics::Experiment, Muon neutrino, Atmospheric neutrino, Neutrino, Signature (topology), Neutrino oscillation, Energy (signal processing)
Abstract: Muon neutrino disappearance probability as a function of neutrino flight length L over neutrino energy E was studied. A dip in the L/E distribution was observed in the data, as predicted from the sinusoidal flavor transition probability of neutrino oscillation. The observed L/E distribution constrained nu_mu nu_tau neutrino oscillation parameters; 1.9x10^-3 < Delta m^2 < 3.0x10^-3 eV^2 and \sin^2(2theta) > 0.90 at 90% confidence level., Comment: 5 pages, 5 figures, submitted to PRL
Published: 2004

96. Search for Dark Matter WIMPs using Upward Through-going Muons in Super-Kamiokande

Author: K. Kaneyuki, G. Guillian, H. W. Sobel, Atsumu Suzuki, S. Mine, M. Goldhaber, J. Y. Kim, Mikio Morii, Takaaki Kajita, Magdalena Malek, E. Kearns, Y. Nagashima, H. Takeuchi, Hyosun Kim, M. Ishitsuka, Shoei Nakayama, Lawrence Sulak, C. Saji, David William Casper, Shantanu Desai, Nobuyuki Sakurai, Yoshihiro Suzuki, Todd Haines, Masatoshi Koshiba, C. McGrew, Y. Totsuka, E. Blaufuss, Y. Ashie, Y. Hayato, S. Ueda, Y. Takeuchi, Shinya Yamada, R. Nishimura, Makoto Sakuda, Minoru Yoshida, M. D. Messier, J. L. Stone, A. Kibayashi, T. Kobayashi, Kunio Inoue, Michael B. Smy, K. K. Shiraishi, W. R. Kropp, W. Wang, Y. Kajiyama, T. Inagaki, Toshio Namba, M. Earl, K. Nitta, Kenzo Nakamura, Yoshitaka Itow, Kyoshi Nishijima, C. W. Sterner, T. Ishii, C. Yanagisawa, C. Mauger, H. Seo, H. Maesaka, A. Minamino, Yusuke Koshio, Shigetaka Moriyama, T. Iwashita, Mark R. Vagins, Masaya Hasegawa, M. Miura, A. Okada, K. Hayashi, Kazumasa Miyano, John Hill, C. W. Walter, T. Hashimoto, J. G. Learned, T. Ishizuka, K. Washburn, T. Shibata, A. K. Ichikawa, D. Takemori, T. Ooyabu, G. W. Sullivan, C. Mitsuda, S. Hatakeyama, Masayuki Nakahata, R. Gran, C. K. Jung, D. Turcan, D. Kielczewska, Taichi Morita, R. W. Ellsworth, Katsuhiro Kobayashi, D. W. Liu, J. Kameda, M. Takita, R. J. Wilkes, I. Kato, Y. Nakajima, Hirokazu Ishino, I. T. Lim, A. Sarrat, Y. Fukuda, K. Ishihara, Y. Obayashi, S. Tasaka, W. E. Keig, J. A. Goodman, T. Harada, T. Kato, K. Nishikawa, Yuichi Oyama, Tomoyuki Maruyama, S. B. Kim, J. Zalipska, K. S. Ganezer, J. P. Cravens, T. Ishida, Takehisa Hasegawa, T. Sasaki, Y. Choi, W. Gajewski, Kate Scholberg, Y. Watanabe, T. Toshito, Shoji Yamamoto, J. Shirai, E. Sharkey, S. Dazeley, S. Fukuda, H. Okazawa, Alec Habig, S. Matsuno, Y. Gando, R. Nambu, J. Yoo, Masato Shiozawa, T. Barszczak, A. Suzuki, R. Svoboda, and Tsuyoshi Nakaya
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Physics::Instrumentation and Detectors, Dark matter, Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), WIMP, Neutrino detector, Weakly interacting massive particles, High Energy Physics::Experiment, Neutrino, Super-Kamiokande, Light dark matter
Abstract: We present the results of indirect searches for Weakly Interacting Massive Particles (WIMPs) with 1679.6 live days of data from the Super-Kamiokande detector using neutrino-induced upward through-going muons. The search is performed by looking for an excess of high energy muon neutrinos from WIMP annihilations in the Sun, the core of the Earth, and the Galactic Center, as compared to the number expected from the atmospheric neutrino background. No statistically significant excess was seen. We calculate flux limits in various angular cones around each of the above celestial objects. We obtain conservative model-independent upper limits on WIMP-nucleon cross-section as a function of WIMP mass and compare these results with the corresponding results from direct dark matter detection experiments., 10 pages, 14 figures, Submitted to Phys. Rev. D
Published: 2004

97. Detection of diffuse TeV gamma-ray emission from the nearby starburst galaxy NGC 253

Author: T. Hara, C. Itoh, S. Hara, J. Kushida, A. Asahara, Geoffrey V. Bicknell, A. Watanabe, S. Watanabe, Masatoshi Ohishi, Ryoji Enomoto, J. R. Patterson, Yoshihiko Mizumoto, F. Kajino, Yutaka Matsubara, T. Uchida, S. Hayashi, S. Kabuki, H. Muraishi, Fuyuki Tokanai, Tsuguya Naito, H. Tsunoo, R. J. Protheroe, D. L. Swaby, K. Tsuchiya, Takanori Yoshikoshi, Tatsuo Yoshida, T. Hattori, Kyoshi Nishijima, Yasushi Muraki, Shin. Hayashi, Toru Tanimori, T. Nakase, A. Kawachi, D. Nishida, H. Moro, K. Sakurazawa, P. G. Edwards, Hideaki Katagiri, Tadashi Kifune, Shohei Yanagita, Ko Okumura, Roger W Clay, Masaki Mori, Shuichi Gunji, and Hidetoshi Kubo
Subjects: Physics, Photomultiplier, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Hadron, Gamma ray, FOS: Physical sciences, Astronomy and Astrophysics, Cosmic ray, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Coincidence, Galaxy, law.invention, Telescope, Space and Planetary Science, law, Halo, Astrophysics::Galaxy Astrophysics
Abstract: We report the TeV gamma-ray observations of the nearby normal spiral galaxy NGC 253. At a distance of $\sim$2.5 Mpc, NGC 253 is one of the nearest starburst galaxies. This relative closeness, coupled with the high star formation rate in the galaxy, make it a good candidate TeV gamma-ray source. Observations were carried out in 2000 and 2001 with the CANGAROO-II 10 m imaging atmospheric Cerenkov telescope. TeV gamma-ray emission is detected at the $\sim 11\sigma$ level with a flux of $(7.8 \pm 2.5)\times 10^{-12} {\rm cm}^{-2} {\rm sec}^{-1}$ at energies $>$0.5 TeV. The data indicate that the emission region is broader than the point spread function of our telescope., Comment: 4 pages, double colomn, 3 figures, aa.cls
Published: 2002

98. Initial Performance of CANGAROO-II 7m telescope

Author: S. Yanagita, Philip G. Edwards, Hiroshi Muraishi, J. Jinbo, J. Kushida, M. D. Roberts, Gavin Rowell, J. R. Patterson, Shuichi Gunji, Yoshihiko Mizumoto, R. Susukita, Tatsuo Yoshida, Toru Tanimori, S. A. Dazeley, Hidetoshi Kubo, M. Moriya, K. Sakurazawa, Tsuguya Naito, Yutaka Matsubara, Y. Sato, Satoshi Hara, Takanori Yoshikoshi, Masaki Mori, Kyoshi Nishijima, Takashi Sako, Takayuki Tamura, Akiko Kawachi, A. Yuki, Tadashi Kifune, Y. Muraki, and T. Hara
Subjects: Physics, Parabolic reflector, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Curved mirror, Astronomy, Field of view, Astrophysics, law.invention, Telescope, law, Focus (optics), Cherenkov radiation
Abstract: CANGAROO group constructed an imaging air Cherenkov telescope (CANGAROO-II) in March 1999 atWoomera, South Australia to observe celestial gamma-rays in hundreds GeV region. It has a 7m parabolic mirror consisting of 60 small plastic spherical mirrors, and the prime focus is equipped with a multi-pixel camera of 512 PMTs covering the field of view of 3 degrees. We report initial performance of the telescope., 5 pages, 7 figures, to appear in the proceedings of the GeV-TeV Gamma-Ray Astrophysics Workshop, "Towards a Major Atmospheric Cherenkov Detector VI" (Snowbird, Utah, August 13-16, 1999)
Published: 1999

99. The SNR W28 at TeV Energies

Author: S. Yanagita, Takeo Hara, G. J. Thornton, Kyoshi Nishijima, Hiroshi Muraishi, Takashi Sako, Tetsuya Yoshida, Jamie Holder, Gavin Rowell, Toru Tanimori, Yutaka Matsubara, Shuichi Gunji, Shoichi Ogio, S. A. Dazeley, R. Susukita, J. R. Patterson, K. Sakurazawa, T. Tamura, Masaki Mori, Y. Muraki, Tadashi Kifune, Y. Mizumoto, A. Kawachi, Tsuguya Naito, Takanori Yoshikoshi, Philip G. Edwards, and M. D. Roberts
Subjects: Physics, Shock wave, biology, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Gamma-ray astronomy, Astrophysics, biology.organism_classification, Shock (mechanics), law.invention, Telescope, Acceleration, law, Egret, Supernova remnant, Astrophysics::Galaxy Astrophysics
Abstract: The southern supernova remnant (SNR)W28 was observed in 1994 and 1995 by the CANGAROO 3.8m telescope in a search formulti-TeV gamma ray emission, using the Cerenkov imaging technique. We obtained upper limits for a variety of point-like and extended features within a +-1 degree-region and briefly discuss these results, together with that of EGRET within the framework of a shock acceleration model of the W28 SNR., Comment: 5 pages, 2 figures, to appear in the proceedings of the GeV-TeV Gamma-Ray Astrophysics Workshop, "Towards a Major Atmospheric Cherenkov Detector VI" (Snowbird, Utah, August 13-16, 1999)
Published: 1999

100. Neutrino-induced upward stopping muons in Super-Kamiokande

Author: Y. Hatakeyama, Y. Takeuchi, Shinya Yamada, Yasunari Suzuki, Y. Totsuka, Kazumasa Miyano, M. Earl, Michael B. Smy, Kyoshi Nishijima, L. R. Sulak, H. W. Sobel, W. Doki, C. Mauger, J. Hill, W. E. Keig, T. Kobayashi, J. L. Stone, T. Inagaki, Masatoshi Koshiba, M. Takahashi, D. Takemori, E. Kearns, K. Nishikawa, M. Kohama, A. Okada, S. Hatakeyama, Yoshitaka Itow, M. Goldhaber, M. Kirisawa, Yohei Kobayashi, M. Koike, K. Higuchi, C. W. Walter, D. Casper, Makoto Sakuda, O. Sasaki, Minoru Yoshida, S. Nakayama, K. Nakamura, K. Kaneyuki, C. McGrew, Takaaki Kajita, C. Saji, K. Ishihara, S. Inaba, N. Sakurai, Ken-ichiro Kobayashi, J. A. Goodman, Alec Habig, E. Blaufuss, M. Miura, H. Fujiyasu, Y. Nagashima, K. Martens, S. Matsuno, M. Koga, Masayuki Nakahata, H. Takeuchi, Akira Hasegawa, A. Sakai, R. W. Ellsworth, A. L. Stachyra, Soo-Bong Kim, L. R. Price, J. Shirai, B. K. Kim, W. Gajewski, Kate Scholberg, T. Ishii, M. D. Messier, S. Echigo, A. Kibayashi, J. Kameda, Shigeki Tasaka, E. Sharkey, S. Kasuga, Y. Fukuda, V. J. Stenger, K. S. Ganezer, M. Takita, M. L. Chen, R. J. Wilkes, Ko Okumura, Hiroshi Ogawa, Takehisa Hasegawa, Yuichi Oyama, Takashi Yamaguchi, Hirokazu Ishino, K. K. Young, Kunio Inoue, Tomoyuki Maruyama, John G. Learned, M. Nemoto, T. Futagami, J. S. George, F. Tsushima, C. Yanagisawa, A. T. Suzuki, G. W. Sullivan, H. Okazawa, Y. Kanaya, M. Etoh, Y. Watanabe, R. Sanford, S. Mine, C. K. Jung, M. Takahata, A. Suzuki, D. Kielczewska, R. Svoboda, Y. Obayashi, Y. Hayato, T. J. Haines, W. R. Kropp, T. Iwamoto, Masato Shiozawa, Yusuke Koshio, T. Barszczak, Mark R. Vagins, and B. Viren
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Flux, Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, Expected value, High Energy Physics - Experiment, Nuclear physics, High Energy Physics::Experiment, Neutrino, Neutrino oscillation, Super-Kamiokande, Zenith
Abstract: A total of 137 upward stopping muons of minimum energy 1.6 GeV are observed by Super-Kamiokande during 516 detector live days. The measured muon flux is 0.39+/-0.04(stat.)+/-0.02(syst.)x10^{-13}cm^{-2}s^{-1}sr^{-1} compared to an expected flux of 0.73+/-0.16(theo.)x10^{-13}cm^{-2}s^{-1}sr^{-1}. Using our previously-published measurement of the upward through-going muon flux, we calculate the stopping/through-going flux ratio R}, which has less theoretical uncertainty. The measured value of R=0.22+/-0.02(stat.)+/-0.01(syst.) is significantly smaller than the value 0.37^{+0.05}_{-0.04}(theo.) expected using the best theoretical information (the probability that the measured R is a statistical fluctuation below the expected value is 0.39%). A simultaneous fitting to zenith angle distributions of upward stopping and through-going muons gives a result which is consistent with the hypothesis of neutrino oscillations with the parameters sin^2 2\theta >0.7 and 1.5x10^{-3} < \Delta m^2 < 1.5x10^{-2} eV^2 at 90% confidence level, providing a confirmation of the observation of neutrino oscillations by Super-Kamiokande using the contained atmospheric neutrino events., Comment: 15 pages, including 7 figures. Submitted to Physics Letters Revision fixes typo in author field
Published: 1999

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