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To measure the flux of atmospheric neutrons and study the neutron contribution to the background of the main detector of the PoGOLite (Polarized Gamma-ray Observer) balloon-borne experiment, a thermal-neutron detector with a phoswich system of LiCaAlF6 (Eu) and BGO crystal scintillators is developed. The performance to separate thermal-neutron events from those of gamma-rays and charged particles...
In the present paper, we describe the development of an α-ray imaging detector based on a ZnO single crystalline scintillator and a position-sensitive photomultiplier tube (PSPMT). The ZnO crystal was grown by the hydrothermal synthesis method with 2-inch-φ in diameter. The ZnO specimen was polished out to be 0.5 mm in thickness. After optically coupling with PSPMT, the crystal was irradiated with...
Thermal neutron imaging with Eu doped 6LiCaAlF6, which is a novel thermal neutron scintillator, was demonstrated. Eu doped 6LiCaAlF6 single crystal was grown by Czochralski technique and grown crystal was cut and polished to a plate shape. Setup of the thermal neutron imaging consisted of the plate shaped Eu doped 6LiCaAlF6, a position sensitive photomultiplier tube, Cd-mask and 252Cf in the polyethylene...
Thermal neutron imaging with Ce doped 6LiCaAlF6, which is a novel thermal neutron scintillator, was demonstrated. Ce doped 6LiCaAlF6 single crystal was grown by Czochralski technique and grown crystal was cut and polished to a plate shape. Setup of the thermal neutron imaging consisted of the plate shaped Ce doped 6LiCaAlF6, a position sensitive photomultiplier tube, alphabet-shaped Cd-masks and 252...
For high-sensitivity neutron measurement, we developed a phoswich detector consisting of LiYF4 (Ce 1%) and BGO crystals. Light outputs of LiYF4 excited from ??-ray (simulating neutron excitation) have the faster decay-time constant ??~50 ns, compared with that from the shielding BGO crystal (??~300 ns), and these waveforms output from a preamplifier are clearly distinguished each other. When the waveforms...
Ce2%:6LiCaAlF6 (6LiCAF) single crystal (nominal composition) with 2 mm in diameter and 50 mm in length was grown by the micro-pulling-down method. Emission from the perturbed Ce3+ centers was observed in an ??-ray excited radioluminescence. The neutron response was compared with Li-glass (GS20, Saint-Gobain) using 252Cf. The scintillation decay time of Ce2%: 6LiCAF is 38 nsec, which is twice as short...
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