H
Hiroyuki Toyokawa
Researcher at National Institute of Advanced Industrial Science and Technology
Publications - 195
Citations - 3717
Hiroyuki Toyokawa is an academic researcher from National Institute of Advanced Industrial Science and Technology. The author has contributed to research in topics: Neutron & Compton scattering. The author has an hindex of 28, co-authored 194 publications receiving 3456 citations.
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Journal ArticleDOI
Evidence for a narrow S = +1 baryon resonance in photoproduction from the neutron.
T. Nakano,D. S. Ahn,J. K. Ahn,Hidetoshi Akimune,Y. Asano,W. C. Chang,S. Daté,Hiroyasu Ejiri,H. Fujimura,M. Fujiwara,M. Fujiwara,K. Hicks,Tomoaki Hotta,K. Imai,Takuji Ishikawa,Takahiro Iwata,H. Kawai,Z. Y. Kim,K. Kino,H. Kohri,N. Kumagai,S. Makino,T. Matsumura,T. Matsumura,N. Matsuoka,Tsutomu Mibe,Tsutomu Mibe,K. Miwa,M. Miyabe,Y. Miyachi,Y. Miyachi,M. Morita,N. Muramatsu,M. Niiyama,Masaharu Nomachi,Y. Ohashi,T. Ooba,Haruo Ohkuma,D. S. Oshuev,Chary Rangacharyulu,Atsushi Sakaguchi,T. Sasaki,P. M. Shagin,P. M. Shagin,Y. Shiino,Hajime Shimizu,Yorihito Sugaya,M. Sumihama,M. Sumihama,Hiroyuki Toyokawa,A. Wakai,C. W. Wang,S. C. Wang,K. Yonehara,K. Yonehara,Tetsuhiko Yorita,Masato Yoshimura,M. Yosoi,R. G.T. Zegers +58 more
TL;DR: The gamman-->K(+)K(-)n reaction on 12C has been studied by measuring both K+ and K- at forward angles and a sharp baryon resonance peak was observed, consistent with an antidecuplet of baryons predicted by the chiral soliton model.
Journal ArticleDOI
The γ→p→K+Λ and γ→p→K+Σ0 reactions at forward angles with photon energies from 1.5 to 2.4 GeV
M. Sumihama,J. K. Ahn,Hidetoshi Akimune,Y. Asano,C. Bennhold,W. C. Chang,T. Corthals,S. Daté,H. Ejiri,H. Fujimura,M. Fujiwara,M. Fujiwara,M. Guidal,K. Hicks,Tomoaki Hotta,K. Imai,T. Ishikawa,T. Iwata,H. Kawai,Z. Y. Kim,K. Kino,H. Kohri,N. Kumagai,S. Makino,Terry Mart,T. Matsumura,N. Matsuoka,Tsutomu Mibe,M. Miyabe,Y. Miyachi,Masato Morita,Norihito Muramatsu,T. Nakano,M. Niiyama,Masaharu Nomachi,Yuji Ohashi,T. Ooba,Haruo Ohkuma,D. S. Oshuev,Chary Rangacharyulu,Atsushi Sakaguchi,Takuya Sasaki,P. M. Shagin,Y. Shiino,Hajime Shimizu,Yorihito Sugaya,Hiroyuki Toyokawa,A. Wakai,C. W. Wang,S. C. Wang,K. Yonehara,Tetsuhiko Yorita,M. Yosoi,R. G. T. Zegers +53 more
TL;DR: Differential cross sections and photon-beam asymmetries for the {gamma}-vectorp{yields}K{sup +}{lambda} and δ-gamma-vector p{y yieldss} K{sup+sigma}{sup 0} reactions have been measured in the photon energy range from 1.5 to 2.4 GeV and in the angular range from {theta}{sub c.m}=0 deg. to 60 deg.
Journal ArticleDOI
φ photo-production from Li, C, Al, and Cu nuclei at E γ=1.5-2.4 GeV
Takatsugu Ishikawa,D. S. Ahn,D. S. Ahn,J. K. Ahn,Hidetoshi Akimune,W. C. Chang,S. Daté,H. Fujimura,H. Fujimura,M. Fujiwara,M. Fujiwara,K. Hicks,Tomoaki Hotta,K. Imai,H. Kawai,K. Kino,H. Kohri,T. Matsumura,T. Matsumura,T. Matsumura,Tsutomu Mibe,Tsutomu Mibe,Tsutomu Mibe,K. Miwa,M. Miyabe,Mizuki Morita,T. Murakami,N. Muramatsu,Hironobu Nakamura,Masanobu Nakamura,Masanobu Nakamura,T. Nakano,M. Niiyama,Masaharu Nomachi,Y. Ohashi,T. Ooba,D. S. Oshuev,Chary Rangacharyulu,Atsushi Sakaguchi,Y. Shiino,Yasuhiro Sakemi,Hajime Shimizu,Yorihito Sugaya,M. Sumihama,M. Sumihama,Y. Toi,Hiroyuki Toyokawa,C. Wang,Tetsuhiko Yorita,M. Yosoi,R. G. T. Zegers,R. G. T. Zegers +51 more
TL;DR: The photo-production of mesons from Li, C, Al, and Cu at forward angles has been measured at E γ = 1.5 − 2.4 GeV, and the number of events for incoherent mesons was found to have a target mass number dependence of A 0.72 ± 0.07 in the kinematical region of | t | ⩽ 0.6 GeV 2 / c 2 as mentioned in this paper.
Journal ArticleDOI
Beam-Polarization Asymmetries for the [Formula presented] and [Formula presented] Reactions for [Formula presented]
R. G.T. Zegers,M. Sumihama,M. Sumihama,D. S. Ahn,J. K. Ahn,Hidetoshi Akimune,Y. Asano,W. C. Chang,S. Daté,Hiroyasu Ejiri,H. Fujimura,M. Fujiwara,M. Fujiwara,K. Hicks,Tomoaki Hotta,K. Imai,Takuji Ishikawa,Takahiro Iwata,H. Kawai,Z. Y. Kim,K. Kino,H. Kohri,N. Kumagai,S. Makino,T. Matsumura,T. Matsumura,N. Matsuoka,Tsutomu Mibe,Tsutomu Mibe,K. Miwa,M. Miyabe,Y. Miyachi,M. Morita,N. Muramatsu,Takashi Nakano,M. Niiyama,Masaharu Nomachi,Y. Ohashi,T. Ooba,Haruo Ohkuma,D. S. Oshuev,Chary Rangacharyulu,Atsushi Sakaguchi,T. Sasaki,P. M. Shagin,Y. Shiino,Hajime Shimizu,Yorihito Sugaya,Hiroyuki Toyokawa,A. Wakai,C. W. Wang,S. C. Wang,K. Yonehara,Tetsuhiko Yorita,Masato Yoshimura,M. Yosoi +55 more
TL;DR: In this paper, the beam polarization asymmetries for the p(gamma-->,K+)Lambda reactions were measured for the first time for E (gamma)=15-24 GeV and 06
Journal ArticleDOI
Evidence for the Θ+ in the γd→K+K-pn reaction by detecting K+K- pairs
Takashi Nakano,Norihito Muramatsu,D. S. Ahn,J. K. Ahn,Hidetoshi Akimune,Y. Asano,W. C. Chang,S. Daté,H. Ejiri,H. Fujimura,M. Fujiwara,S. Fukui,H. Hasegawa,K. Hicks,K. Horie,Tomoaki Hotta,K. Imai,Takatsugu Ishikawa,Takahiro Iwata,Y. Kato,H. Kawai,Z. Y. Kim,K. Kino,H. Kohri,N. Kumagai,S. Makino,T. Matsuda,N. Matsuoka,T. Matsumura,Tsutomu Mibe,M. Miyabe,Y. Miyachi,M. Niiyama,Masaharu Nomachi,Y. Ohashi,Haruo Ohkuma,T. Ooba,D. S. Oshuev,Chary Rangacharyulu,Atsushi Sakaguchi,P. M. Shagin,Y. Shiino,A. Shimizu,Hajime Shimizu,Yorihito Sugaya,M. Sumihama,Y. Toi,Hiroyuki Toyokawa,A. Wakai,C. W. Wang,S. C. Wang,K. Yonehara,Tetsuhiko Yorita,Masato Yoshimura,M. Yosoi,R. G. T. Zegers +55 more
TL;DR: In this paper, the Fermi-motion-corrected nK{sup +} invariant mass distribution shows a narrow peak at 1.524{+-}0.2 nb/sr in the photon energy range from 2.0 to 2.4 GeV in the LEPS angular range.