Correlated 4n system: a recent experimental result using SAMURAI setup

ORAL  · Invited

Abstract

In this talk, I will present recent, high-quality results on the tetraneutron system from a novel experiment performed at the SAMURAI setup at RIKEN. The correlation energy between four neutrons was measured following the quasi-elastic removal of the alpha cluster from 8He projectiles using the missing mass method. This measurement has provided for the first time a notably clean experimental signature for a possible four-neutron resonance state near threshold. The results have been recently published in Nature [2]. The quest now continues with renewed interest as theoretical models attempt to reproduce and explain the experimental result while new experiments aim to confirm and refine the result.

[1] Marqués, F. M. & Carbonell, J. EPJ A 57, 105 (2021).

[2] Duer et al., Nature 606, 678–682 (2022)

*This work was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) Project-ID 279384907 - SFB 1245, the GSI-TU Darmstadt cooperation agreement, by the UK Science and Technology Facilities Council (STFC) under contract numbers ST/P003885/1 and ST/L005727/1 and the University of York Pump Priming Fund, by the German Federal Ministry of Education and Research - BMBF project numbers 05P15RDFN1, 05P15WOFNA and 05P15WOCIA, by project FAIR-RO-04/DEMAND - IFA, by JSPS KAKENHI grant numbers JP16H02177, JP16H02179 and JP18H05404, by the Spanish Research grant PGC2018-099746-B-C21, and by the Swedish Research Council, project grant 2011-5324 and 2017-03839. K.I.H., D. Kim, S.K., L.S., S.Y.P. and D.A. acknowledge the support from the IBS grant funded by the Korea government grant number IBS-R031-D1. C.A.B. acknowledges partial support by the US DOE grant number DE-FG02- 08ER41533. I.G. acknowledges support by HIC for FAIR and Croatian Science Foundation under project numbers 1257 and 7194. Z.E., Z.H. and I.K. acknowledge the support by NKFIH grants numbers 114454, 128947 and GINOP-2.3.3-15-2016-00034. The LPC group acknowledge support from the France-Japanese LIA-International Associated Laboratory for Nuclear Structure Problems as well as the French ANR-14-CE33-0022-02 EXPAND.

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Publication: Duer, M., Aumann, T., Gernhäuser, R., Panin, V., Paschalis, S., Rossi, D. M., et al. Observation of a correlated free four-neutron system. Nature 606, 678–682 (2022). https://doi.org/10.1038/s41586-022-04827-6

Presenters

  • Stefanos Paschalis

    • University of York

Authors

  • Stefanos Paschalis

    • University of York