@article{50f83e42280c46168cec28da2f502e06,
title = "Search for η′ Bound Nuclei in the C 12 (γ,p) Reaction with Simultaneous Detection of Decay Products",
abstract = "We measured missing mass spectrum of the C12(γ,p) reaction for the first time in coincidence with potential decay products from η′ bound nuclei. We tagged an (η+p) pair associated with the η′N→ηN process in a nucleus. After applying kinematical selections to reduce backgrounds, no signal events were observed in the bound-state region. An upper limit of the signal cross section in the opening angle cosθlabηp<-0.9 was obtained to be 2.2 nb/sr at the 90% confidence level. It is compared with theoretical cross sections, whose normalization ambiguity is suppressed by measuring a quasifree η′ production rate. Our results indicate a small branching fraction of the η′N→ηN process and/or a shallow η′-nucleus potential.",
author = "{(LEPS2/BGOegg Collaboration)} and M. Yosoi and N. Tomida and N. Muramatsu and M. Niiyama and Ahn, {J. K.} and Chang, {W. C.} and Chen, {J. Y.} and Chu, {M. L.} and S. Dat{\'e} and T. Gogami and H. Goto and H. Hamano and T. Hashimoto and He, {Q. H.} and K. Hicks and T. Hiraiwa and Y. Honda and T. Hotta and H. Ikuno and Y. Inoue and T. Ishikawa and I. Jaegle and Jo, {J. M.} and Y. Kasamatsu and H. Katsuragawa and S. Kido and Y. Kon and T. Maruyama and S. Masumoto and Y. Matsumura and M. Miyabe and K. Mizutani and H. Nagahiro and T. Nakamura and T. Nakano and T. Nam and Ngan, {T. N.T.} and Y. Nozawa and Y. Ohashi and H. Ohnishi and T. Ohta and K. Ozawa and C. Rangacharyulu and Ryu, {S. Y.} and Y. Sada and M. Sasagawa and T. Shibukawa and H. Shimizu and R. Shirai and K. Shiraishi",
note = "Funding Information: The experiment was performed at the BL31LEP beam line of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) as a contract beam line (Proposal No. BL31LEP/6101). This research was supported in part by the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT) Scientific Research on Innovative Areas Grants No. JP21105003, No. JP24105711, and No. JP18H05402, Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for Specially Promoted Research Grant No. JP19002003, Grant-in-Aid for Scientific Research (A) Grant No. JP24244022, Grant-in-Aid for Young Scientists (A) Grant No. JP16H06007, Grant-in-Aid for Scientific Research (C) Grant No. JP19K03833, Grants-in-Aid for JSPS Fellows No. JP24608, the National Research Foundation of Korea Grant No. 2017R1A2B2011334, and the Ministry of Science and Technology of Taiwan. We thank Professor T. Harada and Professor H. Noumi for discussions on the Fermi averaging method. Publisher Copyright: {\textcopyright} 2020 American Physical Society.",
year = "2020",
month = may,
day = "22",
doi = "10.1103/PhysRevLett.124.202501",
language = "English",
volume = "124",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "20",
}