Study of the β-delayed neutron emissions of ¹¹Li using the DESCANT and GRIFFIN arrays at TRIUMF

Systems that undergo 2-neutron (2n) emission can help probe n-n correlations. Typically, these studies involve unbound nuclei decaying immediately via 2n emission, but statistics is limited.

Alternatively, ¹¹Li a 2n halo nucleus with a large β-2n decay probability, may provide higher statistics to study 2n emissions, albeit with a complex mixture of sequential and simultaneous emission. At TRIUMF, we used the GRIFFIN γ-ray and DESCANT neutron detector arrays to study 1n and 2n emissions following the β-decay of ¹¹Li. Our goal is to clarify discrepancies in β-1n spectrum measured in previous studies and to study possible 2n pathways. I will present the β-delayed 1n and 2n spectra using a simple cross-talk rejection model and demonstrate how β–γ–n coincidences can also be used to identify specific decay paths.