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

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)