Japan Proton Accelerator Research Complex (J-PARC) aims at a MW-class proton
accelerator facility. One of the promising solutions for increasing the beam
power of the Main Ring (MR) is converters of the main magnets with new ones for
this upgrade....
The betatron tune, which is defined as the number of transverse oscillations
in one turn of a ring accelerator, is one of the most important parameters. An
undesired betatron tune increases the amplitude of the transverse oscillation
so that many ...
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 870 12-18 Oct 2017 [Refereed]
J. K. Ahn, K. Y. Baek, S. Banno, B. Beckford, B. Brubaker, B. Brubaker, T. Cai, T. Cai, M. Campbell, C. Carruth, C. Carruth, S. H. Chen, S. Chu, J. Comfort, Y. T. Duh, T. Furukawa, H. Haraguchi, T. Hineno, Y. B. Hsiung, M. Hutcheson, T. Inagaki, M. Isoe, E. Iwai, E. Iwai, T. Kamibayashi, I. Kamiji, N. Kawasaki, E. J. Kim, Y. J. Kim, J. W. Ko, T. K. Komatsubara, T. K. Komatsubara, A. S. Kurilin, G. H. Lee, H. S. Lee, J. W. Lee, J. W. Lee, S. K. Lee, G. Y. Lim, G. Y. Lim, C. Lin, J. Ma, Y. Maeda, Y. Maeda, T. Masuda, T. Masuda, T. Matsumura, D. McFarland, J. Micallef, J. Micallef, K. Miyazaki, K. Morgan, K. Morgan, R. Murayama, D. Naito, D. Naito, K. Nakagiri, Y. Nakajima, Y. Nakajima, Y. Nakaya, H. Nanjo, H. Nanjo, T. Nomura, T. Nomura, T. Nomura, Y. Odani, R. Ogata, H. Okuno, T. Ota, Y. D. Ri, M. Sasaki, N. Sasao, K. Sato, K. Sato, T. Sato, S. Seki, T. Shimogawa, T. Shimogawa, T. Shinkawa, S. Shinohara, K. Shiomi, K. Shiomi, J. S. Son, J. Stevens, J. Stevens, S. Su, Y. Sugiyama, Y. Sugiyama, S. Suzuki, Y. Tajima, G. Takahashi, Y. Takashima, M. Tecchio, I. Teo, I. Teo, M. Togawa, T. Toyoda, Y. C. Tung, Y. C. Tung, T. Usuki
Progress of Theoretical and Experimental Physics 2017 Feb 2017
T. Masuda, T. Masuda, J. K. Ahn, S. Banno, S. Banno, M. Campbell, J. Comfort, Y. T. Duh, T. Hineno, T. Hineno, Y. B. Hsiung, T. Inagaki, E. Iwai, E. Iwai, N. Kawasaki, E. J. Kim, Y. J. Kim, J. W. Ko, T. K. Komatsubara, A. S. Kurilin, G. H. Lee, J. W. Lee, J. W. Lee, S. K. Lee, G. Y. Lim, J. Ma, J. Ma, D. MacFarland, Y. Maeda, Y. Maeda, T. Matsumura, R. Murayama, D. Naito, Y. Nakaya, H. Nanjo, T. Nomura, Y. Odani, Y. Odani, H. Okuno, Y. D. Ri, Y. D. Ri, N. Sasao, K. Sato, K. Sato, T. Sato, S. Seki, T. Shimogawa, T. Shimogawa, T. Shinkawa, K. Shiomi, K. Shiomi, J. S. Son, Y. Sugiyama, S. Suzuki, Y. Tajima, G. Takahashi, Y. Takashima, Y. Takashima, M. Tecchio, M. Togawa, T. Toyoda, T. Toyoda, Y. C. Tung, Y. C. Tung, Y. W. Wah, H. Watanabe, J. K. Woo, J. Xu, J. Xu, T. Yamanaka, Y. Yanagida, Y. Yanagida, H. Y. Yoshida, H. Yoshimoto, H. Yoshimoto
Progress of Theoretical and Experimental Physics 2016 Jan 2016
K. Shiomi, K. Y. Baek, J. Comfort, E. Iwai, N. Kawasaki, J. W. Ko, T. K. Komatsubara, J. W. Lee, G. Y. Lim, Y. Maeda, T. Masuda, D. Naito, Y. Nakaya, H. Nanjo, T. Nomura, M. Sasaki, N. Sasao, K. Sato, T. Shimogawa, Y. Sugiyama, Y. Tajima, G. Takahashi, M. Togawa, H. Watanabe, T. Yamanaka, Y. Yanagida, H. Y. Yoshida
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 664 264-271 Feb 2012
We describe the KL0 flux measurements performed at the J-PARC neutral-kaon beam line. This beam line was constructed for an experiment aiming to observe the CP-violating rare decay KL0→π0νν̄. The primary proton energy was 30 GeV and the KL0 produc...
R. Ogata, S. Suzuki, J. K. Ahn, Y. Akune, V. Baranov, K. F. Chen, J. Comfort, M. Doroshenko, M. Doroshenko, Y. Fujioka, Y. B. Hsiung, T. Inagaki, T. Inagaki, S. Ishibashi, N. Ishihara, H. Ishii, E. Iwai, T. Iwata, I. Kato, S. Kobayashi, S. Komatsu, T. K. Komatsubara, A. S. Kurilin, E. Kuzmin, A. Lednev, A. Lednev, H. S. Lee, S. Y. Lee, G. Y. Lim, J. Ma, T. Matsumura, A. Moisseenko, H. Morii, H. Morii, T. Morimoto, Y. Nakajima, T. Nakano, H. Nanjo, N. Nishi, J. Nix, T. Nomura, T. Nomura, M. Nomachi, H. Okuno, K. Omata, G. N. Perdue, G. N. Perdue, S. Perov, S. Podolsky, S. Podolsky, S. Porokhovoy, K. Sakashita, K. Sakashita, T. Sasaki, N. Sasao, H. Sato, T. Sato, M. Sekimoto, T. Shimogawa, T. Shinkawa, Y. Stepanenko, Y. Sugaya, A. Sugiyama, T. Sumida, T. Sumida, Y. Tajima, S. Takita, Z. Tsamalaidze, T. Tsukamoto, T. Tsukamoto, Y. C. Tung, Y. W. Wah, H. Watanabe, H. Watanabe, M. L. Wu, M. Yamaga, M. Yamaga, T. Yamanaka, H. Y. Yoshida, Y. Yoshimura, Y. Zheng
Physical Review D - Particles, Fields, Gravitation and Cosmology 84 Sep 2011
The rare decay KL0→π0π0νν̄ was studied with the E391a detector at the KEK 12-GeV proton synchrotron. Based on 9.4×109 KL0 decays, an upper limit of 8.1×10-7 was obtained for the branching fraction at 90% confidence level. We also set a limit on th...
Y. C. Tung, Y. B. Hsiung, J. K. Ahn, Y. Akune, V. Baranov, K. F. Chen, J. Comfort, M. Doroshenko, M. Doroshenko, Y. Fujioka, T. Inagaki, T. Inagaki, S. Ishibashi, N. Ishihara, H. Ishii, E. Iwai, T. Iwata, I. Kato, S. Kobayashi, S. Komatsu, T. K. Komatsubara, A. S. Kurilin, E. Kuzmin, A. Lednev, A. Lednev, H. S. Lee, S. Y. Lee, G. Y. Lim, J. Ma, T. Matsumura, A. Moisseenko, H. Morii, H. Morii, T. Morimoto, Y. Nakajima, T. Nakano, H. Nanjo, N. Nishi, J. Nix, T. Nomura, T. Nomura, M. Nomachi, R. Ogata, H. Okuno, K. Omata, G. N. Perdue, G. N. Perdue, S. Perov, S. Podolsky, S. Podolsky, S. Porokhovoy, K. Sakashita, K. Sakashita, T. Sasaki, N. Sasao, H. Sato, T. Sato, M. Sekimoto, T. Shimogawa, T. Shinkawa, Y. Stepanenko, Y. Sugaya, A. Sugiyama, T. Sumida, T. Sumida, S. Suzuki, Y. Tajima, S. Takita, Z. Tsamalaidze, T. Tsukamoto, Y. Wah, H. Watanabe, H. Watanabe, M. L. Wu, M. Yamaga, M. Yamaga, T. Yamanaka, H. Y. Yoshida, Y. Yoshimura, Y. Zheng
Physical Review D - Particles, Fields, Gravitation and Cosmology 83 Feb 2011
We performed a search for the decay KL0→3γ with the E391a detector at KEK. In the data accumulated in 2005, no event was observed in the signal region. Based on the assumption of KL0→3γ proceeding via parity-violation, we obtained the single event...
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 623 585-587 Nov 2010
The J-PARC E14 KOTO experiment aims at the first observation of the KL0→π0ν̄ν decay. This experiment requires a well-collimated neutral beam with the small amount of halo neutrons. Collimation lines and beamline components in the beamline have bee...
J. K. Ahn, Y. Akune, V. Baranov, K. F. Chen, J. Comfort, M. Doroshenko, M. Doroshenko, Y. Fujioka, Y. B. Hsiung, T. Inagaki, T. Inagaki, S. Ishibashi, N. Ishihara, H. Ishii, E. Iwai, T. Iwata, I. Kato, S. Kobayashi, S. Komatsu, T. K. Komatsubara, A. S. Kurilin, E. Kuzmin, A. Lednev, A. Lednev, H. S. Lee, S. Y. Lee, G. Y. Lim, J. Ma, T. Matsumura, A. Moisseenko, H. Morii, T. Morimoto, Y. Nakajima, T. Nakano, H. Nanjo, N. Nishi, J. Nix, T. Nomura, T. Nomura, M. Nomachi, R. Ogata, H. Okuno, K. Omata, G. N. Perdue, G. N. Perdue, S. Perov, S. Podolsky, S. Porokhovoy, K. Sakashita, T. Sasaki, N. Sasao, H. Sato, T. Sato, M. Sekimoto, T. Shimogawa, T. Shinkawa, Y. Stepanenko, Y. Sugaya, A. Sugiyama, T. Sumida, T. Sumida, S. Suzuki, Y. Tajima, S. Takita, Z. Tsamalaidze, T. Tsukamoto, Y. C. Tung, Y. W. Wah, H. Watanabe, M. L. Wu, M. Yamaga, M. Yamaga, M. Yamaga, T. Yamanaka, H. Y. Yoshida, Y. Yoshimura, Y. Zheng
Physical Review D - Particles, Fields, Gravitation and Cosmology 81 Apr 2010
The first dedicated search for the rare neutral-kaon decay KL0→π0νν̄ has been carried out in the E391a experiment at the KEK 12-GeV proton synchrotron. The final upper limit of 2.6×10-8 at the 90% confidence level was set on the branching ratio fo...
High quality of neutral beamline is one of the key points in the J-PARC E14 KOTO experiment, which aims at the first observation of the K 0L → π0 vv̄ decay. This experiment requires a well-collimated neutral beam with very small neutron halo. This...