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

Abstract

A NaI(Tl) detector array called DALI2 (Detector Array for Low Intensity radiation 2) has been constructed for in-beam $\gamma$-ray spectroscopy experiments with fast radioactive isotope (RI) beams. It consists typically of 186 NaI(Tl) scintillators covering polar angles from $\sim$15${}^{\circ }$ to $\sim$160${}^{\circ }$ with an average angular resolution of 6${}^{\circ }$ 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 $\gamma$ rays emitted from fast-moving nuclei (velocities of $v/c\simeq 0.6$). 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.

10 pages, 8 figures

References in corpus (4)

• Spectroscopy of 32Ne and the Island of Inversion
• Lifetime measurements of first excited states in 16,18C
• Exploring the "Island of Inversion" by in-beam gamma-ray spectroscopy of the neutron-rich sodium isotopes 31,32,33Na
• Hindered proton collectivity in 28S: Possible magic number at Z=16

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