Observation of a correlated free four-neutron system
- Duer, M.
- Aumann, T.
- Gernhaeuser, R.
- Panin, V.
- Paschalis, S.
- Rossi, D. M.
- Achouri, N. L.
- Ahn, D.
- Baba, H.
- Bertulani, C. A.
- Boehmer, M.
- Boretzky, K.
- Caesar, C.
- Chiga, N.
- Corsi, A.
- Cortina-Gil, D.
- Douma, C. A.
- Dufter, F.
- Elekes, Z.
- Feng, J.
- Fernandez-Dominguez, B.
- Forsberg, U.
- Fukuda, N.
- Gasparic, I.
- Ge, Z.
- Gheller, J. M.
- Gibelin, J.
- Gillibert, A.
- Hahn, K. I.
- Halasz, Z.
- Harakeh, M. N.
- Hirayama, A.
- Holl, M.
- Inabe, N.
- Isobe, T.
- Kahlbow, J.
- Kalantar-Nayestanaki, N.
- Kim, D.
- Kim, S.
- Kobayashi, T.
- Kondo, Y.
- Koerper, D.
- Koseoglou, P.
- Kubota, Y.
- Kuti, I.
- Li, P. J.
- Lehr, C.
- Lindberg, S.
- Liu, Y.
- Marques, F. M.
- Masuoka, S.
- Matsumoto, M.
- Mayer, J.
- Miki, K.
- Monteagudo, B.
- Nakamura, T.
- Nilsson, T.
- Obertelli, A.
- Orr, N. A.
- Otsu, H.
- Park, S. Y.
- Parlog, M.
- Potlog, P. M.
- Reichert, S.
- Revel, A.
- Saito, A. T.
- Sasano, M.
- Scheit, H.
- Schindler, F.
- Shimoura, S.
- Simon, H.
- Stuhl, L.
- Suzuki, H.
- Symochko, D.
- Takeda, H.
- Tanaka, J.
- Togano, Y.
- Tomai, T.
- Toernqvist, H. T.
- Tscheuschner, J.
- Uesaka, T.
- Wagner, V.
- Yamada, H.
- Yang, B.
- Yang, L.
- Yang, Z. H.
- Yasuda, M.
- Yoneda, K.
- Zanetti, L.
- Zenihiro, J.
- Zhukov, M. V.
DOIAbstract
A long-standing question in nuclear physics is whether chargeless nuclear systems can exist. To our knowledge, only neutron stars represent near-pure neutron systems, where neutrons are squeezed together by the gravitational force to very high densities. The experimental search for isolated multi-neutron systems has been an ongoing quest for several decades(1), with a particular focus on the four-neutron system called the tetraneutron, resulting in only a few indications of its existence so far(2-4), leaving the tetraneutron an elusive nuclear system for six decades. Here we report on the observation of a resonance-like structure near threshold in the four-neutron system that is consistent with a quasi-bound tetraneutron state existing for ...
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