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Candidate Resonant Tetraneutron State Populated by the He 4 ( He 8 </mml:…

2016; American Physical Society; Volume: 116; Issue: 5 Linguagem: Inglês

10.1103/physrevlett.116.052501

1092-0145

K. Kisamori, S. Shimoura, H. Miya, S. Michimasa, S. Ota, M. Assié, H. Baba, T. Baba, D. Beaumel, M. Dozono, Toshihiko Fujii, N. Fukuda, S. Go, F. Hammache, E. Ideguchi, N. Inabe, Mitsuru Itoh, D. Kameda, S. Kawase, T. Kawabata, Masaaki Kobayashi, Y. Kondo, T. Kubo, Y. Kubota, M. Kurata-Nishimura, C. S. Lee, Y. Maeda, Hiroaki Matsubara, K. Miki, Takahiro Nishi, S. Noji, S. Sakaguchi, H. Sakai, Y. Sasamoto, M. Sasano, Y. Satou, Y. Shimizu, A. Stolz, Hiroaki Suzuki, M. Takaki, H. Takeda, Satoshi Takeuchi, A. Tamii, L. Tang, H. Tokieda, M. Tsumura, Т. Уесака, K. Yako, Y. Yanagisawa, R. Yokoyama, K. Yoshida,

Nuclear Physics and Applications

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.