Hiroyasu Ejiri
Osaka University
211 Papers
1.5K Citations
Hiroyasu Ejiri is an academic researcher from Osaka University. The author has contributed to research in topics: Neutrino & Double beta decay. The author has an hindex of 31, co-authored 211 publications. Previous affiliations of Hiroyasu Ejiri include International Christian University & Niels Bohr Institute.
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Papers
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.
Theory of neutrinoless double-beta decay.
TL;DR: It is shown that it is possible to disentangle the various mechanisms and unambiguously extract the important neutrino-mass scale, if all the signatures of the reaction are searched for in a sufficient number of nuclear isotopes.
Neutrinoless double beta decay and neutrino mass
J. D. Vergados,J. D. Vergados,J. D. Vergados,Hiroyasu Ejiri,Hiroyasu Ejiri,Fedor Šimkovic,Fedor Šimkovic +6 more
TL;DR: In this article, the light neutrino mass mechanism is discussed and the question of quenching of the axial vector coupling constant is examined, which may have important consequences on the size of the NMEs.
229
Comment on "Evidence for Neutrinoless Double Beta Decay"
Craig E. Aalseth,F. T. Avignone,A. S. Barabash,Felix Boehm,R.L. Brodzinski,J. I. Collar,P. J. Doe,Hiroyasu Ejiri,Hiroyasu Ejiri,Steven Elliott,Ettore Fiorini,R. J. Gaitskell,Giorgio Gratta,Ryuta Hazama,K. Kazkaz,G. S. King,Richard T. Kouzes,Harry S. Miley,M. K. Moe,A. Morales,J. Morales,A. Piepke,R. G. H. Robertson,Werner Tornow,Petr Vogel,R. A. Warner,J. F. Wilkerson +26 more
TL;DR: In this article, the authors discuss several limitations in the analysis provided in that paper and conclude that there is no basis for the presented claim, and they further conclude that such a claim cannot be supported by the experimental observation of double-beta decay.
189
Comment on "Evidence for Neutrinoless Double Beta Decay"
Craig E. Aalseth,F. T. Avignone,A. S. Barabash,Felix Boehm,R.L. Brodzinski,J. I. Collar,P. J. Doe,Hiroyasu Ejiri,Hiroyasu Ejiri,Steven Elliott,Ettore Fiorini,R. J. Gaitskell,Giorgio Gratta,Ryuta Hazama,K. Kazkaz,G. S. King,Richard T. Kouzes,Harry S. Miley,M. K. Moe,A. Morales,J. Morales,A. Piepke,R. G. H. Robertson,Werner Tornow,Petr Vogel,R. A. Warner,J. F. Wilkerson +26 more
TL;DR: In this article, the authors discuss several limitations in the analysis provided in that paper and conclude that there is no basis for the presented claim, and they further conclude that such a claim cannot be supported by the experimental observation of double-beta decay.
188