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Journal Articles

Cryogenic neutron detector by InSb semiconductor detector with high-density helium-3 gas converter

Nakamura, Tatsuya; Katagiri, Masaki; Aratono, Yasuyuki; Kanno, Ikuo*; Hishiki, Shigeomi*; Sugiura, Osamu*; Murase, Yasuhiro*

Nuclear Instruments and Methods in Physics Research A, 520(1-3), p.76 - 79, 2004/03

 Times Cited Count:8 Percentile:50.96(Instruments & Instrumentation)

The neutron-detection characteristics of a cryogenic neutron detector comprising an InSb semiconductor detector and a helium-3 gas converter were evaluated at a gas pressure of up to 12.5atm at 4.2K. The detector successfully detected stable neutrons under these conditions, where the density of the helium-3 gas is a few-hundred times higher than that at room temperature. It was found that the neutron detection efficiency was correlated with the gas pressure - even in a backward-detection configuration - in low-temperature, high-pressure helium-3.

Journal Articles

Neutron detection by superconducting tunnel junctions on a Li$$_{2}$$B$$_{4}$$O$$_{7}$$ single-crystal absorber

Nakamura, Tatsuya; Katagiri, Masaki; Ukibe, Masahiro*; Ikeuchi, Takashi*; Okubo, Masataka*

Nuclear Instruments and Methods in Physics Research A, 520(1-3), p.67 - 69, 2004/03

 Times Cited Count:26 Percentile:83.83(Instruments & Instrumentation)

We succeeded in detecting neutrons using superconducting tunnel junctions (STJs) fabricated on a single crystal of Li$$_{2}$$B$$_{4}$$O$$_{7}$$. Neutrons are captured in the crystal by the nuclear reactions $$^{6}$$Li + n $$rightarrow$$ T+ $$alpha$$ + 4.78 MeV and $$^{10}$$B + n $$rightarrow$$ $$^{7}$$Li + $$alpha$$ + 2.3 MeV, and generated phonons propagate in the absorber and are measured by the STJs. We selected a single crystal of Li$$_{2}$$B$$_{4}$$O$$_{7}$$ as the absorber material because of properties such as the large neutron cross-section of $$^{6}$$Li and $$^{10}$$B, low $$gamma$$-ray sensitivity, short particle range in the substrate, and fast phonon velocity. Series-connected or multiple STJs on the crystal would enable two-dimensional neutron imaging with high detection efficiency, low gamma-ray background, and a high spatial resolution of a few microns. We demonstrate neutron detection by the STJs and show their X-ray response and neutron detection. The correlation in pulse heights between two junctions located 1.3mm apart clearly indicates the possibility of neutron imaging.

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