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Background: $\beta$-delayed multiple neutron emission has been observed forsome nuclei with A$\leq$100, with $^{100}$Rb being the heaviest $\beta$2nemitter measured to date. So far, only 25 P$_{2n}$ values have been determinedfor the $\sim$300 nuclei that may decay in this way. Accordingly, it is ofinterest to measure P$_{2n}$ values for the other possible multiple neutronemitters throughout the chart of the nuclides. It is of particular interest tomake such measurement for nuclei with A$>$100 to test the predictions oftheoretical models and simulation tools for the decays of heavy nuclei in theregion of very neutron-rich nuclei. In addition, the decay properties of thesenuclei are fundamental for the understanding of astrophysical nucleosynthesisprocesses such as the $r$-process, and safety inputs for nuclear reactors.Purpose: To determine for the first time the two neutron branching ratio,P$_{2n}$ value, for $^{136}$Sb through a direct neutron measurement, and toprovide precise P$_{1n}$ values for $^{136}$Sb and $^{136}$Te. Method: Purebeams were provided by the JYFLTRAP at the IGISOL facility of the University ofJyv\"askyl\"a, Finland. The purified ions were implanted into a moving tape atthe end of the beam line. The detection setup consisted of a plasticscintillator placed right behind the implantation point, and the BELENdetector, based on neutron counters embedded in a polyethylene matrix. Theanalysis was based on the study of the $\beta$- and neutron- growth-and-decaycurves and the $\beta$-one-neutron and $\beta$-two-neutron time correlations.Results: The P$_{2n}$ value of $^{136}$Sb was found to be 0.14(3)\% and themeasured P$_{1n}$ values for $^{136}$Sb and $^{136}$Te were found to be32.2(15)\% and 1.47(6)\%, respectively. The measured P$_{2n}$ value is a factor44 smaller than predicted by the FRDM+QRPA model used for $r$-processcalculations.

First determination of $\beta$-delayed multiple neutron emission beyond A = 100 through direct neutron measurement: The P$_{2n}$ value of $^{136}$Sb