To discuss the dineutron correlation in the ground state, the quasi-freeneutron knockout reaction on $^6$He is investigated.In the present work, themomentum distribution of the two emitted neutrons is calculated with the$\alpha$~+~$n$~+~$n$ three-body model and a simple reaction model to assess theeffects of the knockout process via the $^5$He resonance and the targetdependence in the momentum distribution. A clear signature of the dineutroncorrelation can be obtained by choosing the kinematical condition so theprocess via the $^5$He resonance is excluded because the $^5$He resonancedrastically changes the momentum distribution. Using the proton target isimportant in the quantitative discussion on the dineutron correlation by theknockout reaction. In addition to theoretical arguments, a possibleexperimental setup to determine the dineutron correlation via the quasi-freeknockout reaction is considered.
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