Observation of a correlated free four-neutron system
Author:
Duer M.ORCID, 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., Gasparic I., 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.
Abstract
AbstractA 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 far2–4, 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.
Publisher
Springer Science and Business Media LLC
Subject
Multidisciplinary
Reference31 articles.
1. Marqués, F. M. & Carbonell, J. The quest for light multineutron systems. Eur. Phys. J. A 57, 105 (2021). 2. Marqués, F. M. et al. Detection of neutron clusters. Phys. Rev. C 65, 044006 (2002). 3. Marqués, F. M., Orr, N. A., Al Falou, H., Normand, G. & Clarke, N. M. On the possible detection of 4n events in the breakup of 14Be. Preprint at https://arxiv.org/abs/nucl-ex/0504009 (2005). 4. Kisamori, K. et al. Candidate resonant tetraneutron state populated by the 4He(8He,8Be) reaction. Phys. Rev. Lett. 116, 052501 (2016). 5. Gandolfi, S., Hammer, H.-W., Klos, P., Lynn, J. E. & Schwenk, A. Is a trineutron resonance lower in energy than a tetraneutron resonance? Phys. Rev. Lett. 118, 232501 (2017).
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