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Observation of a correlated free four-neutron system

Duer, M.; Aumann, T.; Gernhäuser, R.; Panin, V.; Paschalis, S.; Rossi, D. M.; Achouri, N. L.; Ahn, D.; Baba, H.; Bertulani, C. A.; Böhmer, M.; Boretzky, K.; Caesar, C.; Chiga, N.; Corsi, A.; Cortina- Gil, D.; Douma, C. A.; Dufter, F.; Elekes, Z.; Feng, J.; Fernández- Domínguez, B.; Forsberg, U.; Fukuda, N.; Gašparić, Igor; Ge, Z.; Gheller, J. M.; Gibelin, J.; Gillibert, A.; Hahn, K. I.; Halász, 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.; Körper, D.; Koseoglou, P.; Kubota, Y.; Kuti, I.; Li, P. J.; Lehr, C.; Lindberg, S.; Liu, Y.; Marqués, 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.; Törnqvist, 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. (2022) Observation of a correlated free four-neutron system. Nature, 606 (7915). pp. 678-682. ISSN 0028-0836

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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 decades1, with a particular focus on the four-neutron system called the tetraneutron, resulting in only a few indications of its existence so far2, 3, 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 a very short time. The measured energy and width of this state provide a key benchmark for our understanding of the nuclear force. The use of an experimental approach based on a knockout reaction at large momentum transfer with a radioactive high-energy 8He beam was key.

Item Type: Article
Uncontrolled Keywords: Nuclear Force ; Nuclear Structure ; Tetraneutron ; Reactions with Radioactive Beams
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Project titleProject leaderProject codeProject type
Zemljovid atomskih jezgara - neutronski bogata stranaSzilner, SuzanaIP-2018-01-1257HRZZ
Nuklearna struktura i reakcije: eksperimentima prema neutronskoj liniji kapanjaSzilner, SuzanaIP-2013-11-7194HRZZ
Depositing User: Igor Gašparić
Date Deposited: 24 Aug 2022 13:32
DOI: 10.1038/s41586-022-04827-6

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