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A NaI(Tl) detector array called DALI2 (Detector Array for Low Intensityradiation 2) has been constructed for in-beam $\gamma$-ray spectroscopyexperiments with fast radioactive isotope (RI) beams. It consists typically of186 NaI(Tl) scintillators covering polar angles from $\sim$15$^{\circ}$ to$\sim$160$^{\circ}$ with an average angular resolution of 6$^{\circ}$ in fullwidth at half maximum. Its high granularity (good angular resolution) enablesDoppler-shift corrections that result in, for example, 10% energy resolutionand 20% full-energy photopeak efficiency for 1-MeV $\gamma$ rays emitted fromfast-moving nuclei (velocities of $v/c \simeq 0.6$). DALI2 has been employedsuccessfully in numerous experiments using fast RI beams with velocities of$v/c = 0.3 - 0.6$ provided by the RIKEN RI Beam Factory.

DALI2: A NaI(Tl) detector array for measurements of $\gamma$ rays from fast nuclei