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To search for an S= -1 di-baryonic state which decays to $\Lambda p$, the ${\rm{}^3He}(K^-,\Lambda p)n_{missing}$ reaction was studied at 1.0 GeV/$c$.Unobserved neutrons were kinematically identified from the missing mass $M_X$of the $ {\rm{}^3He}(K^-,\Lambda p)X$ reaction in order to have a largeacceptance for the $\Lambda pn$ final state. The observed $\Lambda p n$ events,distributed widely over the kinematically allowed region of the Dalitz plot,establish that the major component comes from a three nucleon absorptionprocess. A concentration of events at a specific neutron kinetic energy wasobserved in a region of low momentum transfer to the $\Lambda p$. To accountfor the observed peak structure, the simplest S-wave pole was assumed to existin the reaction channel, having Breit-Wigner form in energy and with a Gaussianform-factor. A minimum $\chi^2$ method was applied to deduce its mass $M_X\ =$2355 $ ^{+ 6}_{ - 8}$ (stat.) $ \pm 12$ (syst.) MeV/c$^2$, and decay-width$\Gamma_X\ = $ 110 $ ^{+ 19}_{ - 17}$ (stat.) $ \pm 27$ (syst.) MeV/c$^2$,respectively. The form factor parameter $Q_X \sim$ 400 MeV/$c$ implies that therange of interaction is about 0.5

Structure near $K^-$+$p$+$p$ threshold in the in-flight $^3$He$(K^-,\Lambda p)n$ reaction