Author/Authors :
Takeuchi، نويسنده , , S. and Motobayashi، نويسنده , , T. and Togano، نويسنده , , Y. and Matsushita، نويسنده , , M. and Aoi، نويسنده , , N. and Demichi، نويسنده , , K. and Hasegawa، نويسنده , , H. and Murakami، نويسنده , , H.، نويسنده ,
Abstract :
A NaI(Tl) detector array called DALI2 (Detector Array for Low Intensity radiation 2) has been constructed for in-beam γ-ray spectroscopy experiments with fast radioactive isotope (RI) beams. It consists typically of 186 NaI(Tl) scintillators covering polar angles from ~15° to ~160° with an average angular resolution of 6° in full width at half maximum. Its high granularity (good angular resolution) enables Doppler-shift corrections that result in, for example, 10% energy resolution and 20% full-energy photopeak efficiency for 1-MeV γ rays emitted from fast-moving nuclei (velocities of v / c ≃ 0.6 ). DALI2 has been employed successfully in numerous experiments using fast RI beams with velocities of v/c=0.3–0.6 provided by the RIKEN RI Beam Factory.
