Abstract
The large acceptance spectrometer SAMURAI plays an important role in experiments at RIBF, RIKEN for studying exotic nuclei far from β stability. We report here the investigation of the responses of the neutron detectors in the SAMURAI facility. The detection efficiency of a single neutron in the NEBULA neutron detector walls was determined to be 32.5 ± 0.3(stat) ± 0.9(syst)% by a measurement of the 7Li(p,n)7Be(g.s.+0.43MeV) reaction at 200 MeV. The effect of multiple hits caused by a single neutron in three-wall configuration of the NeuLAND demonstrator and NEBULA have been investigated in the 29Ne(p,2p) reaction at around 210 MeV/nucleon and analysis method has been developed enabling two or more neutron coincidence measurements. A simulation study for single and four neutron detection is reported. Finally, other recent progress and future perspectives are presented.
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