title: Candidate Resonant Tetraneutron State Populated by the ^{4}He(^{8}He,^{8}Be) Reaction.
abstract: A candidate resonant tetraneutron state is found in the missing-mass spectrum obtained in the double-charge-exchange reaction ^{4}He(^{8}He,^{8}Be) at 186  MeV/u. The energy of the state is 0.83±0.65(stat)±1.25(syst)  MeV above the threshold of four-neutron decay with a significance level of 4.9σ. Utilizing the large positive Q value of the (^{8}He,^{8}Be) reaction, an almost recoilless condition of the four-neutron system was achieved so as to obtain a weakly interacting four-neutron system efficiently.
authors.affiliation: Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.|RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kisamori
authors.affiliation: Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Shimoura
authors.affiliation: Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.|RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Miya
authors.affiliation: Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Michimasa
authors.affiliation: Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Ota
authors.affiliation: IPN Orsay, 15 Rue, Georges, Clemenceau 91400 Orsay, France.
authors.forename: M
authors.initials: M
authors.lastname: Assie
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Baba
authors.affiliation: Department of Physics, Kyoto University, Yoshida-Honcho, Sakyo, Kyoto 606-8501, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Baba
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.|IPN Orsay, 15 Rue, Georges, Clemenceau 91400 Orsay, France.
authors.forename: D
authors.initials: D
authors.lastname: Beaumel
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Dozono
authors.affiliation: Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.|RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Fujii
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Fukuda
authors.affiliation: Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.|RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Go
authors.affiliation: IPN Orsay, 15 Rue, Georges, Clemenceau 91400 Orsay, France.
authors.forename: F
authors.initials: F
authors.lastname: Hammache
authors.affiliation: Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.
authors.forename: E
authors.initials: E
authors.lastname: Ideguchi
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Inabe
authors.affiliation: Cyclotron and Radioisotope Center, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8578, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Itoh
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: D
authors.initials: D
authors.lastname: Kameda
authors.affiliation: Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Kawase
authors.affiliation: Department of Physics, Kyoto University, Yoshida-Honcho, Sakyo, Kyoto 606-8501, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kawabata
authors.affiliation: Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kobayashi
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.|Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8550, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kondo
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kubo
authors.affiliation: Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.|RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kubota
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kurata-Nishimura
authors.affiliation: Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.|RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: C S
authors.initials: CS
authors.lastname: Lee
authors.affiliation: Faculty of Engineering, University of Miyazaki, 1-1 Gakuen, Kibanadai-nishi, Miyazaki 889-2192, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Maeda
authors.affiliation: National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Matsubara
authors.affiliation: Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Miki
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.|Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nishi
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, 640 S Shaw Lane, East Lansing, Michigan 48824, USA.
authors.forename: S
authors.initials: S
authors.lastname: Noji
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.|Department of Physics, Kyushu University, 6-10-1 Hakozaki, Higashi, Fukuoka 812-8581, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Sakaguchi
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Sakai
authors.affiliation: Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Sasamoto
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Sasano
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Sato
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Shimizu
authors.affiliation: National Superconducting Cyclotron Laboratory, Michigan State University, 640 S Shaw Lane, East Lansing, Michigan 48824, USA.
authors.forename: A
authors.initials: A
authors.lastname: Stolz
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Suzuki
authors.affiliation: Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Takaki
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Takeda
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Takeuchi
authors.affiliation: Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Tamii
authors.affiliation: Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
authors.forename: L
authors.initials: L
authors.lastname: Tang
authors.affiliation: Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Tokieda
authors.affiliation: Department of Physics, Kyoto University, Yoshida-Honcho, Sakyo, Kyoto 606-8501, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Tsumura
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Uesaka
authors.affiliation: Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yako
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Yanagisawa
authors.affiliation: Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Yokoyama
authors.affiliation: RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yoshida