Search for η′ Bound Nuclei in the C 12 (γ,p) Reaction with Simultaneous Detection of Decay Products

(LEPS2/BGOegg Collaboration)

doi:10.1103/PhysRevLett.124.202501

Search for η′ Bound Nuclei in the C 12 (γ,p) Reaction with Simultaneous Detection of Decay Products

(LEPS2/BGOegg Collaboration)

Department of Physics

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

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.

Original language	English
Article number	202501
Journal	Physical review letters
Volume	124
Issue number	20
DOIs	https://doi.org/10.1103/PhysRevLett.124.202501
Publication status	Published - 2020 May 22

ASJC Scopus subject areas

Physics and Astronomy(all)

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@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",

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",

}

TY - JOUR

T1 - Search for η′ Bound Nuclei in the C 12 (γ,p) Reaction with Simultaneous Detection of Decay Products

AU - (LEPS2/BGOegg Collaboration)

AU - Yosoi, M.

AU - Tomida, N.

AU - Muramatsu, N.

AU - Niiyama, M.

AU - Ahn, J. K.

AU - Chang, W. C.

AU - Chen, J. Y.

AU - Chu, M. L.

AU - Daté, S.

AU - Gogami, T.

AU - Goto, H.

AU - Hamano, H.

AU - Hashimoto, T.

AU - He, Q. H.

AU - Hicks, K.

AU - Hiraiwa, T.

AU - Honda, Y.

AU - Hotta, T.

AU - Ikuno, H.

AU - Inoue, Y.

AU - Ishikawa, T.

AU - Jaegle, I.

AU - Jo, J. M.

AU - Kasamatsu, Y.

AU - Katsuragawa, H.

AU - Kido, S.

AU - Kon, Y.

AU - Maruyama, T.

AU - Masumoto, S.

AU - Matsumura, Y.

AU - Miyabe, M.

AU - Mizutani, K.

AU - Nagahiro, H.

AU - Nakamura, T.

AU - Nakano, T.

AU - Nam, T.

AU - Ngan, T. N.T.

AU - Nozawa, Y.

AU - Ohashi, Y.

AU - Ohnishi, H.

AU - Ohta, T.

AU - Ozawa, K.

AU - Rangacharyulu, C.

AU - Ryu, S. Y.

AU - Sada, Y.

AU - Sasagawa, M.

AU - Shibukawa, T.

AU - Shimizu, H.

AU - Shirai, R.

AU - Shiraishi, K.

PY - 2020/5/22

Y1 - 2020/5/22

N2 - 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.

AB - 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.

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UR - http://www.scopus.com/inward/citedby.url?scp=85086007810&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.124.202501

DO - 10.1103/PhysRevLett.124.202501

M3 - Article

C2 - 32501086

AN - SCOPUS:85086007810

VL - 124

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 20

M1 - 202501

ER -