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The kinematics of two-neutron emission following the $\beta$-decay of$^{11}$Li was investigated for the first time by detecting the two neutrons incoincidence and by measuring their angle and energy. An array ofliquid-scintillator neutron detectors was used to reject cosmic-ray and$\gamma$-ray backgrounds by pulse-shape discrimination. Cross-talk events inwhich two detectors are fired by a single neutron were rejected using a filtertested on the $\beta$-1n emitter $^9$Li. A large cross-talk rejection rate isobtained ($> 95 \%$) over most of the energy range of interest. Application to$^{11}$Li data leads to a significant number of events interpreted as$\beta$-2n decay. A discrete neutron line at $\approx$ 2 MeV indicatessequential two-neutron emission, possibly from the unbound state at 10.6 MeVexcitation energy in $^{11}$Be.

Study of multi-neutron emission in the $\beta$-decay of $^{11}$Li