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Title:
Candidate Resonant Tetraneutron State Populated by the 4He (8H3, 8Be) ) Reaction
Authors:
Kisamori, K.; Shimoura, S.; Miya, H.; Michimasa, S.; Ota, S.; Assie, M.; Baba, H.; Baba, T.; Beaumel, D.; Dozono, M.; Fujii, T.; Fukuda, N.; Go, S.; Hammache, F.; Ideguchi, E.; Inabe, N.; Itoh, M.; Kameda, D.; Kawase, S.; Kawabata, T.; Kobayashi, M.; Kondo, Y.; Kubo, T.; Kubota, Y.; Kurata-Nishimura, M.; Lee, C. S.; Maeda, Y.; Matsubara, H.; Miki, K.; Nishi, T.; Noji, S.; Sakaguchi, S.; Sakai, H.; Sasamoto, Y.; Sasano, M.; Sato, H.; Shimizu, Y.; Stolz, A.; Suzuki, H.; Takaki, M.; Takeda, H.; Takeuchi, S.; Tamii, A.; Tang, L.; Tokieda, H.; Tsumura, M.; Uesaka, T.; Yako, K.; Yanagisawa, Y.; Yokoyama, R.; Yoshida, K.
Affiliation:
AA(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), AB(Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan), AC(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), AD(Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan), AE(Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan), AF(IPN Orsay, 15 Rue, Georges, Clemenceau 91400 Orsay, France), AG(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), AH(Department of Physics, Kyoto University, Yoshida-Honcho, Sakyo, Kyoto 606-8501, Japan), AI(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; IPN Orsay, 15 Rue, Georges, Clemenceau 91400 Orsay, France), AJ(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), AK(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), AL(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), AM(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), AN(IPN Orsay, 15 Rue, Georges, Clemenceau 91400 Orsay, France), AO(Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan), AP(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), AQ(Cyclotron and Radioisotope Center, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8578, Japan), AR(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), AS(Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan), AT(Department of Physics, Kyoto University, Yoshida-Honcho, Sakyo, Kyoto 606-8501, Japan), AU(Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan), AV(Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8550, Japan; RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), AW(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), AX(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), AY(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), AZ(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), BA(Faculty of Engineering, University of Miyazaki, 1-1 Gakuen, Kibanadai-nishi, Miyazaki 889-2192, Japan), BB(National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba, Japan), BC(Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan), BD(Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan; RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), BE(National Superconducting Cyclotron Laboratory, Michigan State University, 640 S Shaw Lane, East Lansing, Michigan 48824, USA), BF(Department of Physics, Kyushu University, 6-10-1 Hakozaki, Higashi, Fukuoka 812-8581, Japan; RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), BG(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), BH(Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan), BI(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), BJ(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), BK(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), BL(National Superconducting Cyclotron Laboratory, Michigan State University, 640 S Shaw Lane, East Lansing, Michigan 48824, USA), BM(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), BN(Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan), BO(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), BP(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), BQ(Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan), BR(Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan), BS(Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan), BT(Department of Physics, Kyoto University, Yoshida-Honcho, Sakyo, Kyoto 606-8501, Japan), BU(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), BV(Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan), BW(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan), BX(Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan), BY(RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan)
Publication:
Physical Review Letters, Volume 116, Issue 5, id.052501 (PhRvL Homepage)
Publication Date:
02/2016
Origin:
APS
Abstract Copyright:
2016: American Physical Society
DOI:
10.1103/PhysRevLett.116.052501
Bibliographic Code:
2016PhRvL.116e2501K

Abstract

A candidate resonant tetraneutron state is found in the missing-mass spectrum obtained in the double-charge-exchange reaction 4He (8H3, 8Be) 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 4.9 σ . Utilizing the large positive Q value of the (8He, 8Be) reaction, an almost recoilless condition of the four-neutron system was achieved so as to obtain a weakly interacting four-neutron system efficiently.
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