Nature(London) 606, 678 (2022)

M.Duer, T.Aumann, R.Gernhauser, V.Panin, S.Paschalis, D.M.Rossi, N.L.Achouri, D.Ahn, H.Baba, C.A.Bertulani, M.Bohmer, K.Boretzky, C.Caesar, N.Chiga, A.Corsi, D.Cortina-Gil, C.A.Douma, F.Dufter, Z.Elekes, J.Feng, B.Fernandez-Dominguez, U.Forsberg, N.Fukuda, I.Gasparic, Z.Ge, J.M.Gheller, J.Gibelin, A.Gillibert, K.I.Hahn, Z.Halasz, M.N.Harakeh, A.Hirayama, M.Holl, N.Inabe, T.Isobe, J.Kahlbow, N.Kalantar-Nayestanaki, D.Kim, S.Kim, T.Kobayashi, Y.Kondo, D.Korper, P.Koseoglou, Y.Kubota, I.Kuti, P.J.Li, C.Lehr, S.Lindberg, Y.Liu, F.M.Marques, S.Masuoka, M.Matsumoto, J.Mayer, K.Miki, B.Monteagudo, T.Nakamura, T.Nilsson, A.Obertelli, N.A.Orr, H.Otsu, S.Y.Park, M.Parlog, P.M.Potlog, S.Reichert, A.Revel, A.T.Saito, M.Sasano, H.Scheit, F.Schindler, S.Shimoura, H.Simon, L.Stuhl, H.Suzuki, D.Symochko, H.Takeda, J.Tanaka, Y.Togano, T.Tomai, H.T.Tornqvist, J.Tscheuschner, T.Uesaka, V.Wagner, H.Yamada, B.Yang, L.Yang, Z.H.Yang, M.Yasuda, K.Yoneda, L.Zanetti, J.Zenihiro, M.V.Zhukov

Observation of a correlated free four-neutron system

NUCLEAR REACTIONS ¹H(⁸He, pα)⁴NN, E=156 MeV/nucleon; measured reaction products, Ep, Ip, Eα, Iα. ⁴NN; deduced missing mass spectra, ⁴NN resonance, resonance parameters. Comparison with theoretical calculations. The Radioactive Ion Beam Factory operated by the RIKEN Nishina Center and the Center for Nuclear Study, University of Tokyo, using the Superconducting Analyzer for Multi-particles from Radio Isotope Beams (SAMURAI).

doi: 10.1038/s41586-022-04827-6