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Breakup reaction experiment with 82.5 MeV/u 8He beam impinged on CH2 and C targets was carried out in RIKEN.A neutron detector array was calibrated by using the cosmic ray, the γ ray from 6He+Pb reaction and the mono-energetic neutrons from 7Li(p, n)7Be(g.s.+0.43MeV) reaction.The position resolution, timing resolution and neutron detection efficiency were obtained accordingly.CT rejection conditions were developed based on the analysis of the data taken from 7Li(p, n)7Be(g.s.+0.43MeV) test experiment.2-neutron correlation function for 8He breakup reaction was obtained.